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Olen nõus

Urmas Hõrrak

https://etis.ee/CV/Urmas_Hõrrak/est
1.11.1961
737 5857,+372 7375857
urmas.horrak@ut.ee
https://www.fi.ut.ee/
B-3096-2013
PhD (keskkonnafüüsika), Tartu Ülikool, 2001

Teenistuskäik

Töökohad ja ametid
01.05.2018–31.12.2020   
Tartu Ülikool, Loodus- ja täppisteaduste valdkond, füüsika instituut, aerosoolifüüsika vanemteadur (1,00)
01.01.2016–30.04.2018   
Tartu Ülikool, Loodus- ja täppisteaduste valdkond, füüsika instituut, aerosoolifüüsika vanemteadur (1,00)
01.01.2016–30.04.2018   
Tartu Ülikool, Loodus- ja täppisteaduste valdkond, füüsika instituut, laborijuhataja
01.05.2013–31.12.2015   
Tartu Ülikool, Loodus- ja tehnoloogiateaduskond, Tartu Ülikooli Füüsika Instituut, aerosoolifüüsika vanemteadur (1,00)
01.05.2013–31.12.2015   
Tartu Ülikool, Loodus- ja tehnoloogiateaduskond, Tartu Ülikooli Füüsika Instituut, laborijuhataja
01.05.2008–30.04.2013   
Tartu Ülikool, Loodus- ja tehnoloogiateaduskond, Tartu Ülikooli Füüsika Instituut, laborijuhataja
01.05.2008–30.04.2013   
Tartu Ülikool, Loodus- ja tehnoloogiateaduskond, Tartu Ülikooli Füüsika Instituut, aerosoolifüüsika vanemteadur (1,00)
01.01.2008–30.04.2008   
Tartu Ülikool, Loodus- ja tehnoloogiateaduskond, Tartu Ülikooli Füüsika Instituut, erakorraline vanemteadur (1,00)
01.03.2007–31.12.2007   
Tartu Ülikool, Loodus- ja tehnoloogiateaduskond, Tartu Ülikooli Füüsika Instituut, erakorraline vanemteadur (1,00)
01.01.2006–31.01.2006   
Tartu Ülikool, Füüsika-keemiateaduskond, Keskkonnafüüsika instituut, õhuelektrilise monitooringu teadur (1,00)
1985–2006   
Tartu Ülikool, Füüsika-keemiateaduskond, Keskkonnafüüsika instituut, Teadur (1,00)
 
 
Haridustee
1995–2001   
Tartu Ülikool, doktorantuur, PhD (keskkonnafüüsika)
1994–1994   
Tartu Ülikool, füüsikamagister
1980–1985   
Tartu Ülikool, füüsika-keemia teaduskond, geofüüsika
 
 
Teadusorganisatsiooniline ja -administratiivne tegevus
2011−...   
Eesti teaduse infrastruktuuride teekaardi objekti "Eesti Keskkonnaobservatoorium" nõukogu liige
2007−...   
TÜ Füüsika Instituudi Keskkonnafüüsika seminari korraldaja
2007−...   
Tartu Ülikooli Füüsika Instituudi keskkonnafüüsika labori juhataja kohusetäitja, labori juhataja
2008−2018   
Tartu Ülikooli Füüsika Instituudi teadusnõukogu liige
2004−2007   
Tartu Ülikooli füüsikaosakonna nõukogu liige
2002−2007   
TÜ keskkonnafüüsika instituudi Keskkonnafüüsika seminari korraldaja

Kvalifikatsioon

Teaduskraadid
Urmas Hõrrak, doktorikraad, 2001, (juh) Hannes Tammet; Jaan Salm, Air ion mobility spectrum at a rural area (Aeroioonide liikuvusspekter maapiirkonnas), Tartu Ülikool, Füüsika-keemiateaduskond, Keskkonnafüüsika instituut.
 
 
Teaduspreemiad ja tunnustused
2011, Urmas Hõrrak, Tartu Observatooriumi direktori Anu Reinarti tänukiri (9.02.2011) Euroopa Liidu 7. Raamprogrammi projekti EstSpacE elluviimise eest Tartu Observatooriumis aastatel 2008-2011.
2003, Urmas Hõrrak, Maj ja Tor Nessling fondi stipendium. Uurimistöö Helsingi Ülikoolis
1993, Urmas Hõrrak, Eesti Vabariigi Haridusministeeriumi tänukiri (30.03.1993) kauaaegse aktiivse töö eest Eesti koolinoorte täppisteaduste olümpiaadide korraldamisel.
 
 
Teadustöö põhisuunad
ETIS KLASSIFIKAATOR: 4. Loodusteadused ja tehnika; 4.2. Maateadused; CERCS KLASSIFIKAATOR: P500 Geofüüsika, füüsikaline okeanograafia, meteoroloogia ; TÄPSUSTUS: Atmosfäärielekter ja aerosoolifüüsika, atmosfääri aerosool ja aeroioonid, klasterioonide ja aerosooliosakeste liikuvusspektrite dünaamika, nukleatsioon, aeroioonide liikuvus-spektromeetria
 
 
Lisainfo
Juhendatud/juhendatavad järeldoktorid:
Dr Devendraa Siingh’iga (PhD, India Troopilise Meteoroloogia Instituut, Pune, India), 12-kuuline stažeerimine (25.05.2006–19.05.2007) Tartu Ülikoolis India Vabariigi teaduskoostöö programmi “Better Opportunities for Young Scientist in Chosen Area of Science and Technology (BOYSCAST)” stipendiaadina. Uurimistöö teema: Õhusaaste kauglevi uurimine, aeroioonide ja aerosoolide mõõtmised Tahkusel, Eestis.

Dr Hanna Elina Manninen, järeldoktor Helsingi Ülikoolist. Teadustöö teema “Atmosfäärielektri ja kliima vastasmõju (Ilmakehän sähköilmiöiden ja ilmaston välinen vuorovaikutus)”. Juhendajad TÜ-s: Urmas Hõrrak, Hannes Tammet. Projekti finantseerib Soome fond Suomen Kulttuurirahasto perioodil 1.09.2012–31.08.2013.
Doktoritööde (eel)retsenseerimine.
Kannosto, Jonna “Measurement of the Physical Properties of Secondary Organic Aerosol Particles”, doktoridisertasioon, Tampere University of Technology, kaitstud 14.09.2012.

Wagner, Robert "On ion-induced new-particle formation: from well-defined laboratory experiments to atmospheric observations". Kaitstud 31.10.2017. University of Helsinki, Faculty of Science, Department of Physics, Atmospheric Sciences. https://helda.helsinki.fi/handle/10138/225246
http://urn.fi/URN:ISBN:978-952-7091-89-0
Ravusvaheliste seminaride organiseerimine:
Finnish-Estonian air ion and aerosol workshops.
7th Air ion and aerosol workshop, 21–23.08.2006, Pühajärve, Estonia.
9th Air ion and aerosol workshop, 24–26.09.2007, Pühajärve, Estonia.
11th Air ion and aerosol workshop, 8–10.09.2008, Pühajärve, Estonia
14th Air ion and aerosol workshop, 14–16.06.2010, Pühajärve, Estonia.
16th Air ion and aerosol workshop, 12–14.06.2012, Pühajärve, Estonia.
18th Air Ion and Aerosol Workshop, 2–4.06.2014, Pühajärve, Estonia.
19th Air Ion and Aerosol Workshop, 24–26.08.2015, Pühajärve, Estonia.
21th Air Ions, Clusters and Atmospheric Aerosols Workshop, 6–8.06.2017, Pühajärve, Estonia.
Rahvusvaheliste projektide vastutav täitja (PI):
EL 6. Raamprogrammi projekt “European Integrated Project on Aerosol Cloud Climate Air Quality Interactions (EUCAARI)” (kestvus: 2007–2010, vastutav täitja (PI): Hõrrak, U., koordinaator: Kulmala, Markku, Helsingi Ülikool, projekti maksumus Tartu Ülikoolis (59998.91 EUR).

EL 7. Raamprogrammi REGPOT projekt EstSpacE (Expose the Capacity of Estonian Space Research and Technology through High Quality Partnership in Europe) (kestvus: 1.03.2008–28.02.2011, tööpaketi juht: Hõrrak, U., projekti koordinaator: Dr. Reinart, Anu, Tartu Observatoorium, finantseerimine: 1,009,686 EUR).
Osalemine teistes suuremates projektides töögrupi juhina:
Programm “Keskkonnakaitse ja -tehnoloogia teadus- ja arendustegevuses (KESTA)” projekti SLOOM12022T "Eesti Keskkonnaobservatooriumi biosfääri ja atmosfääri alane teadus- ja arendustegevus (BioAtmos) (kestvus: 2011–2014, vastutav täitja: Kaido Soosaar, töögrupi juht: Urmas Hõrrak, asutus: Tartu Ülikool; finantseerimine: 757 600,23 EUR (11 853 868 EEK)).
Eesti teaduse infrastruktuuride teekaardi projekt SLOOM11301T "Eesti Keskkonnaobservatoorium (1.01.2010−31.12.2015)", vastutav täitja: Kaido Kansi, Tartu Ülikool, TÜ Füüsika Instituudi töögrupi juht: Urmas Hõrrak; projekti finantseerimine kokku 1 961 859,00 EUR (30 696 423 EEK).
Retsenseerinud artikleid rahvusvahelise levikuga ajakirjades:
Journal of Atmospheric Chemistry and Physics, Water Journal; Boreal Environment Research, Journal of Aerosol Science, Journal of Geophysical Research Atmospheres, Atmospheric Environment.

Jooksvad projektid

Lõppenud projektid

Juhendamisel väitekirjad

Juhendatud väitekirjad

Juhendatud järeldoktorid

  • 25.05.2006−19.05.2007 Devendraa Siingh " Study of air pollution transport, atmospheric aerosol and air ion measurements at the Tahkuse station, Estonia (Õhusaaste kauglevi uurimine, aeroioonide ja aerosoolide mõõtmised Tahkusel, Eestis)." India Troopilise Meteoroloogia Instituut, Pune, India.
  • 01.09.2012−31.08.2013 Hanna Elina Manninen "Atmosfäärielektri ja kliima vastasmõju (Ilmakehän sähköilmiöiden ja ilmaston välinen vuorovaikutus)." Helsingi Ülikool. Suomen Kulttuurirahasto stipendiaat.

Publikatsioonid

Klass
Aasta
Publikatsioon
 
1.1.
2018
Größ, J.; Hamed, A.; Sonntag, A.; Spindler, G.; Manninen, H. E.; Nieminen, T.; Kulmala, M.; Hõrrak, U.; Plass-Dülmer, C.; Wiedensohler, A.; Birmili, W. (2018). Atmospheric new particle formation at the research station Melpitz, Germany: connection with gaseous precursors and meteorological parameters. Atmospheric Chemistry and Physics, 18 (3), 1835−2018.10.5194/acp-18-1835-2018.
1.1.
2018
Nieminen, Tuomo; Kerminen, Veli-Matti; Petaja, Tuukka; Aalto, Pasi P.; Arshinov, Mikhail; Asmi, Eija; Baltensperger, Urs; Beddows, David C. S.; Beukes, Johan Paul; Collins, Don; Ding, Aijun; Harrison, Roy M.; Henzing, Bas; Hooda, Rakesh; Hu, Min; Horrak, Urmas; Kivekas, Niku; Komsaare, Kaupo; Krejci, Radovan; Kristensson, Adam ... Kulmala, Markku (2018). Global analysis of continental boundary layer new particle formation based on long-term measurements. Atmospheric Chemistry and Physics, 18 (19), 14737−14756.10.5194/acp-18-14737-2018.
5.2.
2018
Tamme, K; Luts, A.; Hõrrak, U., Salm, J.; Junninen, H. (2018). Atmospheric Relevance of Laboratory Experiments on Ion Composition Based on Ion Composition Simulation. 10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA. 10th International Aerosol Conference, 207.
5.2.
2018
Lipp, Helina; Tamm, Eduard; Tamme, Kalju; Komsaare, Kaupo; Kangasluoma, Juha; Hõrrak, Urmas; Junninen, Heikki (2018). Calibration and Ambient Measurements of Sub-3 nm Aerosols. In: .10th International Aerosol Conference (IAC), America's Center, St. Louis, Missouri, 2.-7. september 2018.
5.2.
2018
Lipp, Helina; Tamm, Eduard; Tamme, Kalju; Komsaare, Kaupo; Hõrrak, Urmas; Junninen, Heikki. (2018). Calibration and Ambient Measurements of Sub-3 nm Aerosols. In: .XXII Annual Air Ion and Aerosol Workshop, Pühajärve, Estonia, 8.-9. Mai 2018.
3.4.
2017
Komsaare, Kaupo; Vana, Marko; Mirme, Sander; Palo, Maris; Luts, Aare; Tammet, Hannes; Iher, Hilja; Hõrrak, Urmas (2017). Formation events of intermediate air ions at Tahkuse Observatory in 1995-2016. Proceedings of the 20th International Conference on Nucleation and Atmospheric Aerosols: 20th International Conference on Nucleation and Atmospheric Aerosols, Helsinki, Finland, 25.-30.6.2017. Ed. Roope Halonen, Anna Nikandrova, Jenni Kontkanen, Joonas A. Enroth, Hanna Vehkamäki. Helsinki: Finnish association for aerosol research, 487−490. (REPORT SERIES IN AEROSOL SCIENCE; 200).
5.2.
2017
Noe, Steffen M.; Hõrrak, Urmas; Mirme, Sander; Kaasik, Marko; Krasnova, Alisa; Krasnov, Dmitrii; Komsaare, Kaupo; Kangur, Ahto (2017). SMEAR Estonia - air ion, aerosol and precursor gas measurements. 3rd ACTRIS-2 General Meeting and Science Meeting. Granada, Spain: ACTRIS-2, 1−1.
1.1.
2016
Luts, Aare; Hõrrak, Urmas; Salm, Jaan; Vana, Marko; Tammet, Hannes (2016). Interpretation of Atmospheric Aerosol Measurements by Means of a Numerical Simulator of New Particle Formation Events. Aerosol and Air Quality Research, 16 (4), 930−942.10.4209/aaqr.2015.08.0511.
1.1.
2016
Vana, Marko; Komsaare, Kaupo; Hõrrak, Urmas; Mirme, Sander; Nieminen, Tuomo; Kontkanen, Jenni; Manninen, Hanna E.; Petäjä, Tuukka; Noe, Steffen M.; Kulmala, Markku (2016). Characteristics of new-particle formation at three SMEAR stations. Boreal Environment Research, 21 (3), 345−362.
1.1.
2016
Kulmala, Markku; Hõrrak, Urmas; Manninen, Hanna E.; Mirme, Sander; Noppel, Madis; Lehtipalo, Katrianne; Junninen, Heikki; Vehkamäki, Hanna; Kerminen, Veli-Matti; Noe, Steffen M.; Tammet, Hannes (2016). The legacy of Finnish–Estonian air ion and aerosol workshops. Boreal Environment Research, 21 (3), 181−206.
1.1.
2016
Lappalainen, H. K.; Kerminen, V.-M.; Petäjä, T.; Kurten, T.; Baklanov, A.; Shvidenko, A.; Bäck, J.; Vihma, T.; Alekseychik, P.; Arnold, S.; Arshinov, M.; Asmi, E.; Belan, B.; Bobylev, L.; Chalov, S.; Cheng, Y.; Chubarova, N.; de Leeuw, G.; Ding, A.; Dobrolyubov, S. ... Kulmala, M. (2016). Pan-Eurasian Experiment (PEEX): towards a holistic understanding of the feedbacks and interactions in the land–atmosphere–ocean–society continuum in the northern Eurasian region. Atmospheric Chemistry and Physics, 16, 14421−14461.10.5194/acp-16-14421-2016.
3.1.
2016
Noe, Steffen M.; Krasnova, Alisa; Krasnov, Dmitrii; Niinemets, Ülo; Jõgiste, Kalev; Hõrrak, Urmas; Vana, Marko; Mirme, Sander; Komsaare, Kaupo; Kangur, Ahto (2016). Dynamics of Carbon, Nitrogen and other climate relevant trace gases measured at SMEAR Estonia. Report Series in Aerosol Sciences, 180: Proceedings of the 2nd Pan-Eurasian Experiment (PEEX) Conference and the 6th PEEX Meeting, Beijing, China, 18-20 May 2016. Ed. Hanna K. Lappalainen, Alla Borisova, Dong Liang, Joonas Enroth and Markku Kulmala. Helsinki: Finnish association for aerosol research, 354−360.
5.1.
2016
Parts, Tiia-Ene; Luts, Aare; Komsaare, Kaupo; Noppel, Madis; Hõrrak, Urmas (2016). Links between chemical composition of positive and negative air ions. European Aerosol Conference EAC 2016; Tours, September 4-9, 2016. French Society for Aerosol Research (ASFERA), P1-AAS-AAP-021.
1.1.
2015
Luts, Aare; Hõrrak, Urmas; Salm, Jaan; Vana, Marko; Tammet, Hannes (2015). A Method for Automated Estimation of Parameters Controlling Aerosol New Particle Formation. Aerosol and Air Quality Research, 15 (4), 1166−1177.10.4209/aaqr.2014.10.0232.
1.1.
2015
Noe, S. M.; Niinemets, Ü.; Krasnova, A.; Krasnov, D.; Motallebi, A.; Kängsepp, V.; Jõgiste, K.; Hõrrak, U.; Komsaare, K.; Mirme, S.; Vana, M.; Tammet, H.; Bäck, J.; Vesala, T.; Kulmala, M.; Petäjä, T.; Kangur, A. (2015). SMEAR Estonia: Perspectives of a large-scale forest ecosystem - atmosphere research infrastructure. Forestry Studies / Metsanduslikud Uurimused, 63 (1), 56−84. DOI: 10.1515/fsmu-2015-0009.
1.2.
2015
Größ, J.; Birmili, W.; Hamed, A.; Sonntag, A.; Wiedensohler, A.; Spindler, G.; Maninnen, H. E.; Nieminen, T.; Kulmala, M.; Hõrrak, U.; and Plass-Dülmer, C. (2015). Evolution of gaseous precursors and meteorological parameters during new particle formation events in the Central European boundary layer. Atmospheric Chemistry and Physics Discussions, 15 (2), 2305−2353. DOI: 10.5194/acpd-15-2305-2015.
3.4.
2015
Noe, S. M.; Kangur, A.; Hõrrak, U.; Krasnova, A.; Krasnov, D.; Cordey, H.P.E. (2015). Overview and first results from SMEAR Estonia. Report Series in Aerosol Sciences, 163: Proceedings of the 1st Pan-Eurasian Experiment (PEEX) Conference and the 5th PEEX Meeting. Ed. Kulmala,M., Zilitinkevich, S., Lappalainen, H.K:, Kyrö, E.-M., Kontkanen, J. Helsinki: Finnish association for aerosol research, 318−321.
5.2.
2015
Komsaare, Kaupo; Hõrrak, Urmas; Iher, Hilja (2015). Air ion formation events at Tahkuse Observatory, Estonia. International Baltic Earth Secretariat Publications, 5: A Doctoral Students Conference Challenges for Earth system science in the Baltic Sea region: From measurements to models. University of Tartu and Vilsandi Island, Estonia, 10 - 14 August 2015. International Baltic Earth Secretariat Helmholtz-Zentrum Geesthacht GmbH Max-Planck-Str. 1 D-21502 G, 22−23.
5.2.
2015
Hõrrak, U.; Salm, J.; Komsaare, K.; Luts, A.; Vana, M.; Tammet, H. (2015). Problems with ionization rate in the research of atmospheric aerosols. 2015 European Aerosol Conference (EAC 2015), Milano, Italy, September 6-11, 2015.
1.1.
2014
Tammet, H.; Komsaare, K.; Hõrrak, U. (2014). Intermediate ions in the atmosphere. Atmospheric Research, 135, 263−273.10.1016/j.atmosres.2012.09.009.
3.4.
2014
Hõrrak, Urmas; Salm, Jaan; Komsaare, Kaupo; Luts, Aare; Vana, Marko; Tammet, Hannes. (2014). Problem of Ionization Rate in the Research of Atmospheric Aerosols. In: (1−6).XV International Conference on Atmospheric Electricity, 15-20 June 2014, Norman, Oklahoma, U.S.A. .
5.2.
2014
Laan, Birgit; Komsaare, Kaupo; Kaasik, Marko; Hõrrak, Urmas (2014). Estimating the origin of background aerosol pollution in Estonia. Proceedings of Abstracts 9th International Conference on Air Quality Science and Application: 9th International Conference on Air Quality Science and Application Garmisch-Partenkirchen, 24-28 March 2014. Ed. Mitto, Tonio; Fallmann, Joachim; Mikolajczyk, Urszula; Suppan, Peter; Singh, Vikas; Sokhi, Ranjeet. 247.
5.2.
2014
Noe, Steffen M.; Niinemets, Ülo; Kangur, Ahto; Hõrrak, Urmas; Soosaar, Kaido; Mander, Ülo (2014). Interdisciplinary research at the SMEAR Estonia station. Geophysical Research Abstracts: EGU General Assembly 2014. Vienna,. (Geophysical Research Abstracts; 16).
5.2.
2014
Parts, T.-E.; Luts, A.; Komsaare, K.; Noppel, M.; Hõrrak, U. (2014). On the chemical composition of new particles in the atmosphere. 123−123.
1.1.
2013
Tammet, H.; Komsaare, K.; Hõrrak, U. (2013). Estimating neutral nanoparticle steady-state size distribution and growth according to measurements of intermediate air ions. Atmospheric Chemistry and Physics, 13 (18), 9597−9603.10.5194/acp-13-9597-2013.
3.1.
2013
Manninen, Hanna E.; Tammet, Hannes; Makela, Antti; Haapalainen, Jussi; Mirme, Sander; Nieminen, Tuomo; Franchin, Alessandro; Petaja, Tuukka; Kulmala, Markku; Hõrrak, Urmas (2013). Atmospheric Electricity and Aerosol-Cloud Interactions in Earth's Atmosphere. 1527: 19th International Conference on Nucleation and Atmospheric Aerosols (ICNAA), Colorado State Univ, Ctr Arts, Fort Collins, CO, JUN 23-28, 2013. 790−792. (AIP Conference Proceedings).10.1063/1.4803390.
5.2.
2013
Parts, T.-E.; Luts, A. ; Komsaare, K.; Noppel, M. ; Hõrrak, U. (2013). On the enigma of new particle formation in the atmosphere. 2013 European Aerosol Conference, Prague, 1nd-6th September 2013.
3.2.
2012
Iher, Hilja; Komsaare, Kaupo; Tamm, Eduard; Hõrrak, Urmas (2012). Õhukvaliteedi seisund Tahkuse jaama seiretulemuste järgi. Kait Antso (Toim.). Eesti keskkonnaseire 2007 – 2010 (19−22).. Tallinn: Keskkonnateabe Keskus.
3.2.
2012
Luts, Aare; Hõrrak, Urmas; Parts, Tiia-Ene (2012). Õhu negatiivsete ioonide koostise üks uuemaid uurimismeetodeid. Anna Aret, Helle Kaasik, Piret Kuusk (_EditorsAbbr). EESTI Füüsika seltsi aastaraamat 2011 (11−14).. Tartu: Eesti Füüsika Selts.
5.2.
2012
Größ, Johannes; Birmili, Wolfram; Hamed, Amar; Sonntag, André; Wiedensohler, Alfred; Spindler, Gerald; Maninnen, Hanna Elina; Kulmala, Markku; Hõrrak, Urmas; Plass-Dülmer, Christian. (2012). Atmospheric new particle formation in the Central European boundary layer: A long-term study using Neutral Cluster Air Ion Spectrometer (NAIS) data. European Aerosol Conference EAC- 2012, Granada, 2-7 September 2012. P191.
5.2.
2012
Parts, Tiia-Ene; Noppel, Madis; Luts, Aare; Komsaare, Kaupo; Hõrrak, Urmas (2012). Spectra of positive air ions up to 40 nm as a function of selected trace gases. 2012 European Aerosol Conference, Granada, 2nd-9th September.
5.2.
2012
Salm, J.; Luts, A.; Hõrrak, U.; Vana, M.; Tammet, H. (2012). Simulation of Aerosol Nucleation Bursts: A Case Study. 2012 European Aerosol Conference, Granada, 2nd-9th September 2012.
5.2.
2012
Salm, J.; Intra, P.; Yawootti, A.; Tippayawong, N.; Hõrrak, U. (2012). Influence of Turbulent Diffusion in an Electrical Mobility Spectrometer. 2012 European Aerosol Conference, Granada, 2nd-9th September 2012.
6.3.
2012
Hõrrak, U.; Salm, J.; Tammet, H. (2012). Laboratory of Environmental Physics, Institute of Physics, University of Tartu, Estonia. Newsletter on Atmospheric Electricity, 23 (1), 15−16.
1.1.
2011
Luts, A.; Parts, T.-E.; Hõrrak, U.; Junninen, H.; Kulmala, M. (2011). Composition of negative air ions as a function of ion age and selected trace gases: Mass- and mobility distribution. Journal of Aerosol Science, 42 (11), 820−838.10.1016/j.jaerosci.2011.07.007.
1.1.
2011
Gagné, S.; Lehtipalo, K.; Manninen, H. E.; Nieminen, T.; Schobesberger, S.; Franchin, A.; Yli-Juuti, T.; Boulon, J.; Sonntag, A.; Mirme, S.; Mirme, A.; Hõrrak, U.; Petäjä, T.; Asmi, E.; Kulmala, M. (2011). Intercomparison of air ion spectrometers: an evaluation of results in varying conditions. Atmospheric Measurement Techniques Discussions, 4 (5), 805−822.10.5194/amt-4-805-2011.
1.1.
2011
Hirsikko, A.; Nieminen, T.; Gagné, S.; Lehtipalo, K.; Manninen, H. E.; Ehn, M.; Hõrrak, U.; Kerminen, V.-M.; Laakso, L.; McMurry, P. H.; Mirme, A.; Mirme, S.; Petäjä, T.; Tammet, H.; Vakkari, V.; Vana, M.; Kulmala, M. (2011). Atmospheric ions and nucleation: a review of observations. Atmospheric Chemistry and Physics, 11 (2), 767−798.10.5194/acp-11-767-2011.
1.1.
2011
Luts, A.; Komsaare, K.; Parts, T.-E.; Hõrrak, U. (2011). Links between two different types of spectra of charged nanometer aerosol particles. Atmospheric Research, 101 (3), 527−538.10.1016/j.atmosres.2010.10.025.
1.1.
2011
Ehn, M.; Junninen, H.; Schobesberger, S.; Manninen, H.E.; Franchin, A.; Sipilä, M.; Petäjä, T.; Kerminen, V.-M.; Tammet, H.; Mirme, A.; Mirme, S.; Hõrrak, U.; Kulmala, M.; Worsnop, D.R. (2011). An instrumental comparison of mobility and mass measurements of atmospheric small ions. Aerosol Science and Technology, 45 (4), 522−532.10.1080/02786826.2010.547890.
1.1.
2011
Kaasik, M.; Sofiev, M.; Prank, M.; Ruuskanen, T.; Kukkonen, J.; Hõrrak, U.; Kulmala, M. (2011). Geographical origin of aerosol particles observed during the LAPBIAT measurement campaign in spring 2003 in Finnish Lapland. Boreal Environment Research, 16 (1), 15−35.
1.1.
2011
Kulmala, M.; Asmi, A.; Lappalainen, H. K.; Baltensperger, U.; Brenguier, J.-L.; Facchini, M. C.; Hansson, H.-C.; Hov, Ø.; O'Dowd, C. D.; Pöschl, U.; Wiedensohler, A.; Boers, R.; Boucher, O.; de Leeuw, G.; Denier van der Gon, H. A. C.; Feichter, J.; Krejci, R.; Laj, P.; Lihavainen, H.; Lohmann, U. ... Pandis, S. N. (2011). General overview: European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI) – integrating aerosol research from nano to global scales. Atmospheric Chemistry and Physics, 11 (24), 13061−13143.10.5194/acp-11-13061-2011.
1.1.
2011
Yli-Juuti, T.; Nieminen, T.; Hirsikko, A.; Aalto, P. P.; Asmi, E.; Hõrrak, U.; Manninen, H. E.; Patokoski, J.; Dal Maso, M.; Petäjä, T.; Rinne, J.; Kulmala, M.; Riipinen, I. (2011). Growth rates of nucleation mode particles in Hyytiälä during 2003−2009: variation with particle size, season, data analysis method and ambient conditions. Atmospheric Chemistry and Physics, 11 (24), 12865−12886.10.5194/acp-11-12865-2011.
5.2.
2011
Salm, J.; Hõrrak, U. (2011). Diffusion of charged particles in a DMA with inclined electric field and with a particle collector in gas outlet. 2011 European Aerosol Conference, Manchester, 4th-9th September 2011. 718.
5.2.
2011
Luts, A.; Parts, T.; Hõrrak, U. (2011). Gaseous iodine as a substantial cause of new specific air ions. 2011 European Aerosol Conference, Manchester, 4th-9th September 2011. x, 358.
5.2.
2011
Parts, T.; Luts, A.; Hõrrak, U. (2011). Diethylamine and new charged particles formation. 2011 European Aerosol Conference, Manchester, 4th-9th September 2011. x, 360.
5.2.
2011
Hõrrak, U.; Komsaare, K.; Tammet, H. (2011). Intermediate Ions in the Atmosphere. XIV International Conference on Atmospheric Electricity, Abstracts: XIV International Conference on Atmospheric Electricity, Rio de Janeiro, Brazil, August 07-12, 2011. Rio de Janeiro, Brazil: International Commission on Atmospheric Electricity, 313−313.
1.1.
2010
Paasonen, P.; Nieminen, T., Asmi, E., Manninen, H. E.; Petäjä, T.; Plass-Dülmer, C.; Flentje, H.; Birmili, W.; Wiedensohler, A.; Hõrrak, U.; Metzger, A.; Hamed, A.; Laaksonen, A.; Facchini, M. C.; Kerminen, V.-M.; Kulmala, M. (2010). On the roles of sulphuric acid and low-volatility organic vapours in the initial steps of atmospheric new particle formation. Atmospheric Chemistry and Physics, 10 (22), 11223−11242.10.5194/acp-10-11223-2010.
1.1.
2010
Kerminen, V.-M.; Petäjä, T.; Manninen, H. E.; Paasonen, P.; Nieminen, T.; Sipilä, M.; Junninen, H.; Ehn, M.; Gagné, S.; Laakso, L.; Riipinen, I.; Vehkamäki, H.; Kurten, T.; Ortega, I. K.; Dal Maso, M.; Brus, D.; Hyvärinen, A.; Lihavainen, H.; Leppä, J.; Lehtinen, K. E. J. ... Kulmala, M. (2010). Atmospheric nucleation: highlights of the EUCAARI project and future directions. Atmospheric Chemistry and Physics, 10 (22), 10829−10848.10.5194/acp-10-10829-2010.
1.1.
2010
Manninen, H. E.; Nieminen, T.; Asmi, E., Gagné, S.; Häkkinen, S.; Lehtipalo, K.; Aalto, P.; Vana, M.; Mirme, A.; Mirme, S.; Hõrrak, U.; Plass-Dülmer, C.; Stange, G; Kiss, G.; Hoffer, A.; Törö, N.; Moerman, M.; Henzing, B.; de Leeuw, G.; Brinkenberg, M.; Kouvarakis, G. N. ... Kulmala, M. (2010). EUCAARI ion spectrometer measurements at 12 European sites – analysis of new particle formation events. Atmospheric Chemistry and Physics, 10, 7907−7927.10.5194/acp-10-7907-2010.
1.1.
2010
Kulmala, M.; Riipinen, I.; Nieminen, T.; Hulkkonen, M.; Sogacheva, L.; Manninen, H. E., Paasonen; P., Petäjä; T., Dal Maso; M., Aalto, P. P.; Viljanen, A.; Usoskin, I.; Vainio, R.; Mirme, S.; Mirme, A.; Minikin, A.; Petzold, A.; Hõrrak, U., Plaß-Dülmer, C.; Birmili, W.; Kerminen, V.-M. (2010). Atmospheric data over a solar cycle: no connection between galactic cosmic rays and new particle formation. Atmospheric Chemistry and Physics, 10 (4), 1885−1898.
1.1.
2010
Mirme, S.; Mirme, A.; Minikin, A.; Petzold, A.; Hõrrak, U.; Kerminen, V. -M.; Kulmala, M. (2010). Atmospheric sub-3 nm particles at high altitudes. Atmospheric Chemistry and Physics, 10 (2), 437−451.
3.4.
2010
Manninen, H. E.; Nieminen, T.; Asmi, E.; Gagné, S.; Sipilä, M.; Häkkinen, S.; Laakso, L.; Vana, M.; Mirme, A.; Mirme, S.; Hõrrak, U.; Plass-Dülmer, C.; Stange, G.; Kiss, G.; Hoffer, A.; Moerman, M.; Brinkenberg, M.; Kouvarakis, G. N.; Bougiatioti, K.; O’Dowd, C. ... Kulmala, M. (2010). Cluster spectrometers in long-term field measurements. Proceedings of 2009 EUCAARI Annual Meeting Stockholm 17.-20.11.2009, 107: EUCAARI Annual Meeting Stockholm 17.-20.11.2009. Ed. Lappalainen, H. K.; Asmi, A.; Nieminen, T.; Kulmala, M. Helsinki: University of Helsinki Press, 258−260. (Report Series in Aerosol Science).
3.4.
2010
Hirsikko, A.; Nieminen, T.; Kulmala, M.; Kerminen, V.-M.; Manninen, H. E.; Gagné, S.; Lehtipalo, K.; Laakso, L.; Vana, M.; Hõrrak, U.; Mirme, A.; Mirme, S.; Tammet, H. (2010). Overview on small ions in the atmosphere. Proceedings of the Finnish Center of Excellence and Graduate School in Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change, Annual Workshop 17.-19.5.2010, 109: Finnish Center of Excellence and Graduate School in Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change, Annual Workshop; Kuopio, Finland; 17.-19.5.2010. Ed. Kulmala, M.; Bäck, J.; Nieminen, T. Helsinki: University of Helsinki Press,. (Report Series in Aerosol Science).
3.4.
2010
Kerminen, V-M.; Brus, D.; Hyvärinen, A.; Sipilä, M.; Manninen, H.; Nieminen, T.; Paasonen, P.; Kurten, T.; Vehkamäki, H.; Mirme, A.; Mirme, S.; Horrak, U.; Berndt, T.; Stratmann, F.; Birmili, W.; Minikin, A.; Petzold, A.; Plass-Dülmer, C.; Kulmala, M. (2010). WP1.1: NUCLEATION. Proceedings of 2009 EUCAARI Annual Meeting Stockholm 17.-20.11.2009, 107: EUCAARI Annual Meeting; Stockholm; 17.-20.11.2009. _EditorsAbbr Lappalainen, H. K.; Asmi, A.; Nieminen, T.; Kulmala, M. Helsinki: University of Helsinki Press, 18−24. (Report Series in Aerosol Science).
5.2.
2010
Gagné, S.; Lehtipalo, K.; Manninen, H.E.; Nieminen, T.; Franchin, A.; Schobesberger, S.; Yli-Juuti, T.; Mirme, A.; Mirme, S.; Hõrrak, U.; Asmi, E.; Petäjä, T.; Kulmala, M. (2010). Intercomparison of air ion spectrometers: a baseline for data analysis. International Aerosol Conference 2010; Helsinki, Finland, 29.08.-03.09.2010. Helsinki, 73.
5.2.
2010
Manninen, Hanna E.; Nieminen, Tuomo; Asmi, Eija; Gagné, Stéphanie; Häkkinen, Silja; Hõrrak, Urmas; Plass-Dülmer, Christian; Kiss, Gyula; O`Dowd, Colin D.; Svenningsson, Birgitta; Baltensperger, Urs; Mihalopoulos, Nikos; Decesari, Stefano; Birmili, Wolfram; Boulon, Julien; Sellegri, Karine; Laaksonen, Ari; Laakso, Lauri; Petäjä, Tuukka; Kerminen, Veli-Matti ... Kulmala, Markku (2010). Analysis of particle formation and growth events at different EUCAARI sites. International Aerosol Conference 2010; Helsinki, Finland; 29.08.-03.09.2010. Helsinki, 74.
5.2.
2010
Paasonen, Pauli; Nieminen, Tuomo; Asmi, Eija; Petäjä, Tuukka; Plass-Dülmer, Christian; Birmili, Wolfram; Hõrrak, Urmas; Kerminen, Veli-Matti; Kulmala, Markku (2010). On the roles of sulphuric acid and organic vapours in atmospheric nucleation. International Aerosol Conference 2010; Helsinki, Finland, 29.08.-03.09.2010. 747.
5.2.
2010
Hirsikko, A.; Kulmala, M.; Nieminen, T.; Manninen, H. E.; Gagné, S.; Lehtipalo, K.; Laakso, L.; Vana, M.; Hõrrak, U.; Mirme, A.; Mirme, S.; Tammet, H.; Kerminen, V.-M. (2010). Overview on the observations of small ions in the atmosphere. International Aerosol Conference 2010; Helsinki, Finland; 29.08 - 03.09.2010. 746.
5.2.
2010
Eller, M.; Mirme, S.; Hõrrak, U.; Mirme, A. (2010). Variation of aerosol and air ion distribution during a new-years celebration. International Aerosol Conference, Helsinki, 29. August - 3. September 2010. 1131.
5.2.
2010
Luts, A.; Komsaare, K.; Parts, T.-E.; Hõrrak, U.; Tammet, H. (2010). Effect of ambient air gas concentrations on the shape of air ion mobility spectra. International Aerosol Conference; Helsinki, Finland; August 29-September 3 2010. Helsinki, P1D10.
5.2.
2010
Parts, Tiia-Ene; Luts, Aare; Hõrrak, Urmas (2010). On the first steps from cluster ions to aerosol particles. International Aerosol Conference 2010; Helsinki, Finland; August 29-September 3 2010. Helsinki, P3W55.
1.1.
2009
Manninen, H. E.; Petäjä, T.; Asmi, E.; Riipinen, I.; Nieminen, T.; Mikkilä, J.; Hõrrak, U.; Mirme, A.; Mirme, S.; Laakso, L.; Kerminen, V.-M.; Kulmala, M. (2009). Long-term field measurements of charged and neutral clusters using Neutral cluster and Air Ion Spectrometer (NAIS). Boreal Environment Research, 14, 591−605.
1.1.
2009
Salm, J.; Hõrrak, U. (2009). Diffusion Distortions in a Differential Mobility Analyzer with Inclined Electric Field. Aerosol Science and Technology, 43 (3), 227−231. DOI: 10.1080/02786820802587904.
1.1.
2009
Tammet, H.; Hõrrak, U.; Kulmala, M. (2009). Negatively charged nanoparticles produced by splashing of water. Atmospheric Chemistry and Physics, 9 (2), 357−367.
3.2.
2009
Luts, A.; Parts, T.-E.; Hõrrak, U.; Komsaare, K. (2009). Links Between Two Different Types Spectra of Charged Nanometer Aerosol Particles. In: Jirˇi Smolik, Colin O'Dowd (Ed.). Nucleation and Atmospheric Aerosols. 18th International Conference (711−714).. Prague: Institute of Chemical Process Fundamentals, Academy of Sciences of Czech Republic.
3.4.
2009
Manninen, H. E.; Gagné, S.; Asmi, E.; Sipilä, M.; Riipinen, I.; Laakso, L.; Vana, M.; Mirme, A.; Mirme, S.; Hõrrak, U.; Plass-Dülmer, C.; Stange, G.; Kiss, G.; Hoffer, A.; Moerman, M.; Brinkenberg, M.; Kouvarakis, G. N.; Bougiatioti, K.; O’Dowd, C.; Ceburnis, D. ... Kulmala, M. (2009). Continuous Field Measurements Using Cluster Spectrometers within the EUCAARI Project. 18th International Conference on Nucleation and Atmospheric Aerosols, Prague, Czech Republic, 10 – 14 August 2009. Ed. J. Smolik, C. O’Dowd. Prague: Institute of Chemical Process Fundamentals ASCR, 355−358.
3.4.
2009
Kerminen, V.-M. ; Lihavainen, H.; Brus, D.; Asmi, E.; Sipilä, M.; Manninen, H. E.; Kurten, T.; Vehkamäki, H.; Ortega, I. K.; Mirme, A.; Mirme, S.; Uin, J. ; Hõrrak, U.; Berndt, T.; Stratmann, F.; Lehtinen, K.; Baltensperger, U. ; Laaksonen, A. ; Kulmala, M. (2009). Nucleation Studies within the EUCAARI Project. 18th International Conference on Nucleation and Atmospheric Aerosols, Prague, Czech Republic, 10 – 14 August 2009.. _EditorsAbbr J. Smolik, C. O’Dowd. Prague: Institute of Chemical Process Fundamentals ASCR, 322−325.
5.2.
2009
Manninen, H. E.; Gagné, S.; Asmi, E.; Sipilä, M.; Riipinen, I.; Laakso, L.; Vana, M.; Mirme, A.; Mirme, S.; Hõrrak, U.; Plass-Dülmer, C.; Stange, G.; Kiss, G.; Hoffer, A.; Moerman, M.; Brinkenberg, M.; Kouvarakis, G. N.; Bougiatioti, K.; O’Dowd, C.; Ceburnis, D. ... Kulmala, M. (2009). Cluster Spectrometers in intensive field measurements within the EUCAARI Project. European Aerosol Conference 2009, Karlsruhe, Germany, 6 - 11 September 2009. T041A13.
5.2.
2009
Komsaare, K.; Hõrrak, U.; Tammet, H. (2009). Classification of intermediate air ion formation events at urban area. European Aerosol Conference 2009: Karlsruhe, September 6-11, 2009. Karlsruhe, T041A19.
5.2.
2009
Parts, T.-E.; Luts, A.; Hõrrak, U.; Komsaare, K. (2009). Acetonitrile and new charged clusters formation. European Aerosol Conference 2009: Karlsruhe, September 6-11, 2009. Karlsruhe, T027A02.
1.1.
2008
Kulmala, M.; Kerminen, V.-M.; Laaksonen, A.; Riipinen, I.; Sipilä, M.; Ruuskanen, T. M.; Sogacheva, L.; Hari, P.; Bäck, J.; Lehtinen, K. E. J.; Viisanen, Y.; Bilde, M.; Svenningsson, B.; Lazaridis, M.; Tørseth, K.; Tunved, P.; Nilsson, E. D.; Pryor, S.; Sørensen, L.-L.; Hõrrak, U. ... Hansson, H.-C. (2008). Overview of the biosphere–aerosol–cloud–climate interactions (BACCI) studies. Tellus. Series B: Chemical and Physical Meteorology, 60B (3), 300−317. DOI: 10.1111/j.1600-0889.2008.00354.x.
1.1.
2008
Hõrrak, U.; Aalto, P.P.; Salm, J.; Komsaare, K.; Tammet, H.; Mäkelä, J.M.; Laakso, L.; Kulmala, M. (2008). Variation and balance of positive air ion concentrations in a boreal forest. Atmospheric Chemistry and Physics, 8, 655−675.
1.1.
2008
Suni, T.; Kulmala, M.; Hirsikko, A.; Bergman, T.; Laakso, L.; Aalto, P. P.; Leuning, R.; Cleugh, H.; Zegelin, S.; Hughes, D.; van Gorsel, E.; Kitchen, M.; Vana, M.; Hõrrak, U.; Mirme, S.; Mirme, A.; Sevanto, S; Twining, J.; Tadros, C. (2008). Formation and characteristics of ions and charged aerosol particles in a native Australian Eucalypt forest. Atmospheric Chemistry and Physics, 8, 129−139.
3.2.
2008
Kulmala, M.; Kerminen, V.-M.; Laaksonen, A.; Riipinen, I.; Sipilä, M.; Ruuskanen, T.M.; Kurtén, T.; Lauri, A.; Sogacheva, L.; Hari, P.; Bäck, J.; Lihavainen, H.; Lehtinen, K.E.J.; Hakola, H.; Viisanen, Y.; Bilde, M.; Svenningsson, B.; Lazaridis, M.; Torseth, K.; Yttri, K.E. ... Hansson, H.-C. (2008). Studies on Biosphere-Aerosol-Cloud-Climate Interactions within BACCI. In: Kulmala, M; Bäck, L; Salonen, M. (_EditorsAbbr). Proceedings of the Nordic Centers of Excellence BACCI (Biosphere-Atmosphere-Cloud-Climate Interactions) and CBACCI (Carbon-BACCI) Activities in 2003-2007. (5−32).. Helsinki: Finnish association for aerosol research. (Report Series in Aerosol Science ; 92).
3.4.
2008
Manninen, H.; Gagné, S.; Asmi, E.; Sipilä, M.; Riipinen, I.; Laakso, L.; Vana, M.; Mirme, A.; Mirme, S.; Hõrrak, U.; Plass-Dülmer, C.; Stange, G.; Kiss, G.; Hoffer, A.; Moerman, M.; Brinkenberg, M.; Kouvarakis, G.N.; Bougiatioti, K.; O'Dowd, C.; Ceburnis, D. ... Kulmala, M. (2008). Cluster and ion spectrometers measuring in 13 EUCAARI field sites. Proceedings of 2008 EUCAARI Annual Meeting, Helsinki 17-21.11.2008.. Ed. Lappalainen, H.K.; Asmi, A; Nieminen, T.; Kulmala, M. Helsinki: University of Helsinki Press, 145−149. (Report Series in Aerosol Science; 99).
3.4.
2008
Kerminen, V-M.; Asmi, E.; Brus, D.; Sipilä, M.; Manninen, H.; Kurtén, T.; Vehkamäki, H.; Ortega, I.; Mirme, A.; Mirme, S.; Uin, J.; Hõrrak, U.; Berndt, T.; Stratmann, F.; Laaksonen, A.; Kulmala, M. (2008). 1. Emission and formation element. WP1.1: Nucleation (EUCAARI work package abstracts). Proceedings of 2008 EUCAARI Annual Meeting, Helsinki 17-21.11.2008.. _EditorsAbbr Lappalainen, H.K.; Asmi, A; Nieminen, T.; Kulmala, M. Helsinki: Finnish association for aerosol research, 11−15. (Report Series in Aerosol Science; 99).
5.2.
2008
Salm, J.; Hõrrak, U. (2008). Diffusion of charged particles in a DMA with inclined electric field: Simplification of equations, The European Aerosol Conference 2008, Thessaloniki, Abstract T04A065P. European Aerosol Conference; Thessaloniki, Greece; 24-29 August 2008.
1.1.
2007
Komppula, M.; Vana, M.; Kerminen, V.-M.; Lihavainen, H.; Viisanen, Y.; Hõrrak, U.; Komsaare, K.; Tamm, E.; Hirsikko, A.; Laakso, L.; Kulmala, M. (2007). Size distributions of atmospheric ions in the Baltic Sea region. Boreal Environment Research, 12 (3), 323−336.
1.1.
2007
Ruuskanen, T.M.; Kaasik, M.; Aalto, P.P.; Hõrrak, U.; Vana, M.; Mårtensson, E.M.; Yoon, Y.J.; Keronen, P.; Mordas, G.; Ceburnis, D.; Nilsson, E.D.; O’Dowd, C.; Noppel, M.; Alliksaar, T.; Ivask, J.; Sofiev, M.; Prank, M.; Kulmala, M. (2007). Concentrations and fluxes of aerosol particles during the LAPBIAT measurement campaign in Värriö field station. Atmospheric Chemistry and Physics, 7 (14), 3683−3700.
1.1.
2007
Hirsikko, A.; Bergman, T.; Laakso, L.; Dal Maso, M.; Riipinen, I.; Hõrrak, U.; Kulmala, M. (2007). Identification and classification of the formation of intermediate ions measured in boreal forest. Atmospheric Chemistry and Physics, 7, 201−210.
3.1.
2007
Suni, T.; Kulmala, M.; Sogacheva, L.; Hirsikko, A.; Bergman, T.; Aalto, P.; Vana, M.; Hõrrak, U.; Mirme, S.; Mirme, A.; Laakso, L.; Dal Maso, M.; Leuning, R.; Cleugh, H.; Zegelin, S.; Hughes, D.; Hurley, R.; van Gorsel, E.; Kitchen, M.; Keywood, M. ... Paatero, J. (2007). Ions and charged aerosol particles in a native Australian eucalypt forest. In: O'Dowd, C.; Wagner, P. (Ed.). Nucleation and Atmospheric Aerosols; 17th International Conference; Galway, Ireland, 2007 (902−905).. Springer.
3.4.
2007
Komsaare, K.; Hõrrak, U.; Tammet, H.; Siingh, D.; Vana, M.; Hirsikko, A.; Kulmala, M. (2007). Classification of intermediate air ion formation events at Tahkuse observatory. Proceedings of the 13th International Conference on Atmospheric Electricity, 1. Beijing: CAS, 116−119.
5.2.
2007
Komppula, M.; Vana, M.; Kerminen, V.-M.; Lihavainen, H.; Viisanen, Y.; Hõrrak, U.; Komsaare, K.; Tamm, E.; A. Hirsikko, L. Laakso, L.; Kulmala, M. (2007). Size distribution of atmospheric ions in Baltic Sea region. European Aerosol Conference 2007, Salzburg, 9.-14.09.2007, Abstract T13A096.
5.2.
2007
Salm, J.; Hõrrak, U. (2007). Diffusion of charged particles in a DMA with inclined electric field. European Aerosol Conference 2007, Salzburg, Abstract T02A009.
5.2.
2007
Komsaare, K.; Siingh, D.; Mirme, A.; Hõrrak, U. (2007). Overview of nucleation events based on air ion measurements at Tahkuse observatory. European Aerosol Conference 2007, Salzburg, Abstract T13A166.
1.1.
2006
Tammet, H.; Hõrrak, U.; Laakso, L.; Kulmala, M. (2006). Factors of air ion balance in a coniferous forest according to measurements in Hyytiälä, Finland. Atmospheric Chemistry and Physics, 6, 3377−3390.
1.1.
2006
Vana, M.; Tamm, E.; Hõrrak, U.; Mirme, A.; Tammet, H.; Laakso, L.; Aalto, P.P.; Kulmala, M. (2006). Charging state of atmospheric nanoparticles during the nucleation burst events. Atmospheric Research, 82, 536−546. DOI: 10.1016/j.atmosres.2006.02.010.
1.3.
2006
Hirsikko, A.; Laakso, L.; Bergman, T.; Petäjä, T.; Gagne, S.; Vana, M.; Hõrrak, U.; Aalto, P.; Mirme, A.; Tammet, H.; Kulmala, M. (2006). Air ion and aerosol particle measurements and the formation of new particles. Report Series in Aerosol Science, 80, 50−53.
1.3.
2006
Hõrrak, U.; Tammet, H.; Aalto, P.P.; Vana, M.; Hirsikko, A.; Laakso, L.; Kulmala, M. (2006). Formation of Charged Nanometer Aerosol Particles Associated with Rainfall: Atmospheric Measurements and Lab Experiment. Report Series in Aerosol Science, 81A, 180−185.
3.2.
2006
Hirsikko, A.; Bergman, T.; Laakso, L.; Dal Maso, M.; Riipinen, I.; Hõrrak, U.; Kulmala, M. (2006). Observations of charged aerosol particles in boreal forest during 21 months. In: Kulmala, M., Lindroth A., Ruuskanen, T. (_EditorsAbbr). Proceedings of BACCI, NECC and FCoE activities (176−179).. Helsinki: Finnish association for aerosol research. (Report Series in Aerosol Science 81A).
1.1.
2005
Hirsikko, A.; Laakso, L.; Horrak, U.; Aalto, P.P.; Kerminen, V.M.; Kulmala, M. (2005). Annual and size dependent variation of growth rates and ion concentrations in boreal forest. Boreal Environment Research, 10 (5), 357−369.
1.2.
2005
Hõrrak, U.; Aalto, P.P.; Salm, J.; Mäkelä, J.M.; Laakso, L.; Kulmala, M. (2005). Characterization of air ions in boreal forest air during Biofor III campaign. Atmospheric Chemistry and Physics Discussions, 5 (3), 2749−2790.
3.2.
2005
Hõrrak, U.; Aalto, P.; Salm, J.; Vana, M.; Hirsikko, A.; Laakso, L.; Kulmala, M. (2005). Estimation of the ionization rate from air ion and aerosol particle measurements at boreal forest. In: Kulmala, M.; Ruuskanen, T. (Ed.). Research Unit on Physics, Chemistry and Biology of Atmospheric Composition and Climate Change: III Progress Report and Proceedings of Seminar (91−96).. Helsinki: Finnish association for aerosol research. (Report series in aerosol science; 73).
3.2.
2005
Hirsikko, A; Laakso, L.; Hõrrak, U.; Aalto, P.P.; Kulmala, M. (2005). Growth rates of air ions and particles at SMEAR II. In: Report Series in Aerosol Science (84−86).. Helsinki: Finnish association for aerosol research.
3.2.
2005
Hirsikko, A; Mordas, G.; Aalto, P.P.; Mirme, A.; Hõrrak, U.; Kulmala, M. (2005). Calibration of the air ion spectrometer. In: Report Series in Aerosol Science (87−90).. Helsinki: Finnish association for aerosol research.
3.2.
2005
Vana, M.; Noppel, M.; Hõrrak, U.; Ruuskanen, T.; Aalto, P.P.; Kulmala, M. (2005). Characteristics of the nucleation burst events during LAPBIAT measurement campaign. In: Report Series in Aerosol Science (317−321).. Helsinki: Finnish association for aerosol research.
5.2.
2005
Hirsikko, A; Mordas, G.; Aalto, P.P.; Mirme, A.; Hõrrak, U.; Kulmala, M. (2005). Calibration and testing of Air Ion Spectrometer. European Aerosol Conference 2005; Ghent, Belgium; 28 August - 2 September 2005. _EditorsAbbr Maenhaut, W. Ghent, Belgium, 436.
5.2.
2005
Hirsikko, A; Laakso, L.; Hõrrak, U.; Aalto, P.P.; Kulmala, M. (2005). Growth rates of aerosol particles and ions in boreal forest. European Aerosol Conference 2005, 28 August - 2 September 2005, Ghent, Belgium. _EditorsAbbr W. Maenhaut. Ghent, Belgium, 485.
5.2.
2005
Vana, M.; Noppel, M.; Hõrrak, U.; Ruuskanen, T.; Aalto, P.P.; Kulmala, M. (2005). Formation and growth events of atmospheric nanoparticles at Värriö research station during LAPBIAT measurement campaign. European Aerosol Conference 2005; Ghent, Belgium; 28 August - 2 September 2005. Ed. Maenhaut, W. Ghent, Belgium, 488.
5.2.
2005
Hõrrak, U.; Tammet, H.; Aalto, P.P.; Vana, M.; Hirsikko, A; Laakso, L.; Kulmala, M. (2005). Formation of charged nanometer aerosol particles associated with rainfall. European Aerosol Conference 2005; Ghent, Belgium; 28 August - 2 September 2005. Ed. Maenhaut, W. Ghent, Belgium, 606.
1.1.
2004
Laakso, L.; Petäjä, T.; Lehtinen, KEJ.; Kulmala, M.; Paatero, J.; Hõrrak, U.; Tammet, H.; Joutsensaari, J. (2004). Ion production rate in a boreal forest based on ion, particle and radiation measurements. Atmospheric Chemistry and Physics, 4, 1933−1943.
1.1.
2004
Laakso, L.; Anttila, T.; Lehtinen, K.E.J.; Aalto, P.P.; Kulmala, M.; Hõrrak, U.; Paatero, J.; Hanke, M.; Arnold, F. (2004). Kinetic nucleation and ions in boreal forest particle formation events. Atmospheric Chemistry and Physics, 4, 2353−2366.
1.1.
2004
Kulmala, M.; Laakso, L.; Lehtinen, KEJ.; Riipinen, I.; Dal Maso, M.; Anttila, T.; Kerminen, VM.; Horrak, U.; Vana, M.; Tammet, H. (2004). Initial steps of aerosol growth. Atmospheric Chemistry and Physics, 4, 2553−2560.
1.1.
2004
Vana, M.; Kulmala, M.; Dal Maso, M.; Horrak, U.; Tamm, E. (2004). Comparative study of nucleation mode aerosol particles and intermediate air ions formation events at three sites. Journal of Geophysical Research-Atmospheres, 109, -.
3.1.
2004
Laakso, L.; Anttila, T.; Lehtinen, K.; Hõrrak, U.; Kulmala, M. (2004). Kinetic nucleation and ions in boreal forests. Abstracts of the European Aerosol Conference 2004, 35, Supplement 1: European Aerosol Conference 2004, Budapest, Hungary, 6-10 September, 2004. Elsevier, S101−S102. (Journal of Aerosol Science).
3.1.
2004
Hõrrak, U.; Tammet, H.; Aalto, P.P.; Kulmala, M. (2004). Charge distribution on nanometer aerosol particles in the atmosphere during nucleation burst events. Abstracts of the European Aerosol Conference 2004, 35, Supplement 1: European Aerosol Conference 2004, Budapest, Hungary, 6-10 September, 2004. Elsevier, S299−S300. (Journal of Aerosol Science).
3.1.
2004
Komsaare, K.; Mirme, A.; Hõrrak, U. (2004). Small air ion and radon measurements at Tahkuse Observatory. Abstracts of the European Aerosol Conference 2004, 35, Supplement 1: European Aerosol Conference 2004, Budapest, Hungary, 6-10 September, 2004. Elsevier, S1009−S1010. (Journal of Aerosol Science).
3.1.
2004
Laaksonen, A.; Kulmala, M.; O Dowd, C.; Viisanen, Y.; Nilsson, D; Facchini, M.; Hoffmann, T.; Arnold, F.; Schell, B.; Junkermann, W.; Coe, H.; Worsnop, D.; Riekkola, M.; Hõrrak, U. (2004). Quantification of aerosol nucleation in the European boundary layer (QUEST): Results from an intensive field campaign in boreal forest. Abstracts of the European Aerosol Conference 2004, 35, Supplement 1: European Aerosol Conference 2004, Budapest, Hungary, 6-10 September, 2004. Elsevier, S1225−S1226. (Journal of Aerosol Science).
3.1.
2004
Sihto, S.; Korhonen, H.; Komppula, M.; Lehtinen, K.; Lihavainen, H.; Ruuskanen, T.; Hõrrak, U.; Kulmala, M. (2004). Lagrangian analysis of new particle formation events in Finnish Lapland. Abstracts of the European Aerosol Conference 2004, 35, Supplement 1: European Aerosol Conference 2004, Budapest, Hungary, 6-10 September, 2004. Elsevier, S957−S958. (Journal of Aerosol Science).
3.2.
2004
Hõrrak, U.; Tammet, H.; Aaalto, P.P.; Kulmala, M. (2004). Study of air ions and nanometer particles in the atmosphere during nucleation burst events. In: Markku Kulmala, Taina Ruuskanen (_EditorsAbbr). Proceedings of BACCI activities 2004, Book A (184−189).. Helsinki: Finnish association for aerosol research. (Report Series in Aerosol Science (Helsinki)).
3.2.
2004
Hõrrak, U.; Tammet, H.; Aalto, P.P.; Kulmala, M. (2004). On the charge distribution on nanometer aerosol particles in the atmosphere during nucleation burst events at boreal forest. In: Report Series in Aerosol Science (94−99).. Helsinki: Finnish association for aerosol research.
3.2.
2004
Lehtinen, K.; Dal Maso, M.; Laakso, L.; Riipinen, I.; Anttila, T.; Napari, I.; Korhonen, H.; Sihto, S.; Vana, M.; Hõrrak, U.; Kerminen, V.; Kulmala, M. (2004). Analyses on particle formation and growth rates during the QUEST campaign. In: Report Series in Aerosol Science (153−155).. Helsinki: Finnish association for aerosol research.
3.2.
2004
Ruuskanen, T.M.; Aalto, P.P.; Hõrrak, U.; Vana, M.; Mårtensson, M.; Yoon, Y.; Kaasik, M.; Keronen, P.; Nilsson, D; O Dowd, C.; Noppel, M.; Kulmala, M. (2004). Observations of particle formation events during LAPBIAT measurement campaign in Värriö field station. In: Kulmala, M.; Salonen, M.; Ruuskanen, T.M. (Ed.). Research unit on physics, chemistry and biology of atmospheric composition and climate change: II Progress Report and Proceedings of Seminar (266−269).. Helsinki: Finnish association for aerosol research. (Report Series in Aerosol Science; 68).
3.2.
2004
Sihto, S.; Korhonen, H.; Komppula, M.; Lehtinen, K.; Lihavainen, H.; Ruuskanen, T.; Hõrrak, U.; Kulmala, M. (2004). Modelling study of new particle formation events in Northern Finland: a Lagrangian trajectory analysis. In: Report Series in Aerosol Science (281−283).. Helsinki: Finnish association for aerosol research.
3.2.
2004
Laakso, L.; Anttila, T.; Lehtinen, K.; Hõrrak, U.; Paatero, J.; Kulmala, M. (2004). Kinetic nucleation and ions in boreal forest. In: Report Series in Aerosol Science (131−135).. Helsinki: Finnish association for aerosol research.
3.4.
2004
Hõrrak, U.; Tammet, H.; Aalto, P.P.; Kulmala, M. (2004). Charging state of nanometer aerosol particles in the atmosphere during nucleation burst events at boreal forest. In: Nucleation and Atmospheric Aerosols 2004: 16th Intenational Conference (307−310).. Kyoto: Kyoto University Press.
1.1.
2003
Horrak, U.; Salm, J.; Tammet, H. (2003). Diurnal variation in the concentration of air ions of different mobility classes in a rural area. Journal of Geophysical Research-Atmospheres, 108, AAC7-1−AAC7-11. DOI: 10.1029/2002JD003240.
3.1.
2003
Hõrrak, U.; Aalto, P.; Salm, J.; Kulmala, M. (2003). Characterization of air ions during nucleation events in boreal forest air. Abstracts of the European Aerosol Conference 2003, 34, Supplement 1: European Aerosol Conference 2003, 31 August – 5 September 2003, Madrid, Spain. Pergamon, S733−S734. (Journal of Aerosol Science).
3.1.
2003
Vana, M.; Kulmala, M.; Dal Maso, M.; Hõrrak, U. (2003). Some characteristics of the nucleation mode particles and intermediate air ions formation events in the atmospheric boundary layer. In: Journal of Aerosol Science (S735−S736).. Elsevier.
3.2.
2003
Hõrrak, U.; Aalto, P.; Salm, J.; Kulmala, M. (2003). Characterization of air ions during nucleation events in boreal forest air. In: Report Series in Aerosol Science (196−201).. Helsinki: Finnish association for aerosol research.
3.4.
2003
Hõrrak, U.; Salm, J.; Tammet, H. (2003). Diurnal variation in the concentration of air ions of different mobility classes. In: Chauzy, S.; Laroche, P. (_EditorsAbbr). ICAE 2003 Versailles. 12th International Conference On Atmospheric Electricity; Versailles, France; June 9-13 2003 (287−290).. Paris: Onera/ISP Press.
3.2.
2002
Iher, H.; Hõrrak, U.; Salm, J. (2002). Õhuseire Tahkusel. Roose, A. (_EditorsAbbr). Eesti Keskkonnaseire 2001 (26−27).. Tartu: Tartu Ülikooli Kirjastus.
3.2.
2002
Vana, M.; Kulmala, M.; DalMaso, M.; Hõrrak, U. (2002). On the formation and growth of nucleation mode particles and intermediate air ions in the atmospheric boundary layer. Report series in aerosol science (202−207).. Helsinki: Finnish association for aerosol research.
2.3.
2001
Hõrrak, U. (2001). Air Ion Mobility Spectrum at a Rural Area. (Doktoritöö, Tartu Ülikool, keskkonnafüüsika instituut). Tartu: Tartu University Press.
3.1.
2001
Hõrrak, U.; Salm, J.; Tammet, H. (2001). Diurnal variation of charged atmospheric aerosols in nucleation and Aitken mode ranges. Journal of Aerosol Science, 32, S169−S170.
3.1.
2001
Tamm, E.; Hõrrak, U.; Mirme, A.; Vana, M. (2001). On the charge distribution on atmospheric nanoparticles. In: Journal of Aerosol Science (S347−S348).. Elsevier.
1.1.
2000
Horrak, U.; Salm, J.; Tammet, H. (2000). Statistical characterization of air ion mobility spectra at Tahkuse Observatory: Classification of air ions. Journal of Geophysical Research-Atmospheres, 105, 9291−9302.
3.1.
2000
Noppel, M.; Hõrrak, U. (2000). Simulation of the mobility spectrum of charged particles during bursts in atmospheric air. 31. Elsevier, S700−S701.
3.1.
2000
Vana, M.; Hõrrak, U.; Tamm, E. (2000). Comparative study of the ultrafine aerosol particle and intermediate air ion concentration bursts in the atmosphere. In: Journal of Aerosol Science (S176−S177).. Elsevier.
3.4.
1999
Hõrrak, U.; Salm, J.; Tammet, H. (1999). Classification of natural air ions near the ground. 11th International Conference on Atmospheric Electricity: June 7-11,1999, Guntersville, Alabama, USA. _EditorsAbbr H.J. Christian. Marshall Space Flight Center (MSFC), Alabama: National Aeronautics and Space Administration (NASA), 618−621.
1.1.
1998
Horrak, U.; Mirme, A.; Salm, J.; Tamm, E.; Tammet, H. (1998). Air ion measurements as a source of information about atmospheric aerosols. Atmospheric Research, 46, 233−242.
1.1.
1998
Horrak, U.; Salm, J.; Tammet, H. (1998). Bursts of intermediate ions in atmospheric air. Journal of Geophysical Research-Atmospheres, 103, 13909−13915.
3.1.
1998
Hõrrak, U.; Mirme, A.; Salm, J.; Tamm, E.; Tammet, H. (1998). Study of covariations of aerosol and air ion mobility spectra at Tahkuse, Estonia. In: Journal of Aerosol Science (S849−S850).. Elsevier.
3.2.
1998
Hõrrak, U.; Iher, H.; Salm, J. (1998). Keskkonnaseire Tahkusel. Environmental Monitoring at Tahkuse. Eesti keskkonnaseire (30−33).. Tartu: Keskkonnaministeeriumi Info- ja Tehnokeskus. (Keskkonnaministeeriumi Info- ja Tehnokeskus).
3.1.
1996
Hõrrak, U.; Salm, J.; Tamm, E.; Tammet, H. (1996). Derivation of the size spectrum of aerosol particles from a mobility spectrum. In: Kulmala, M.; Wagner, P.E. (_EditorsAbbr). Nucleation and atmospheric aerosols (562−565).. Oxford, Tarrytown: Pergamon-Elsevier Science Ltd.
1.1.
1994
Horrak, U.; Iher, H.; Luts, A.; Salm, J.; Tammet, H. (1994). Mobility spectrum of air ions at tahkuse-observatory. Journal of Geophysical Research-Atmospheres, 99, 10697−10700.
15.05.2020

Urmas Hõrrak

https://etis.ee/CV/Urmas_Hõrrak/eng
1.11.1961
737 5857,+372 7375857
urmas.horrak@ut.ee
B-3096-2013
PhD (environmental physics),
University of Tartu, 2001

Career

Institutions and positions
01.05.2018–31.12.2020   
University of Tartu, Faculty of Science and Technology, Institute of Physics, Senior Research Fellow in Aerosol Physics (1,00)
01.01.2016–30.04.2018   
University of Tartu, Faculty of Science and Technology, Institute of Physics, Senior Research Fellow in Aerosol Physics (1,00)
01.01.2016–30.04.2018   
University of Tartu, Faculty of Science and Technology, Institute of Physics, Head of Laboratory
01.05.2013–31.12.2015   
University of Tartu, Faculty of Science and Technology (old), Institute of Physics, University of Tartu, Senior Research Fellow in Aerosol Physics (1,00)
01.05.2013–31.12.2015   
University of Tartu, Faculty of Science and Technology (old), Institute of Physics, University of Tartu, Head of Laboratory
01.05.2008–30.04.2013   
University of Tartu, Faculty of Science and Technology (old), Institute of Physics, University of Tartu, Head of Laboratory
01.05.2008–30.04.2013   
University of Tartu, Faculty of Science and Technology (old), Institute of Physics, University of Tartu, Senior Research Fellow in Aerosol Physics (1,00)
01.01.2008–30.04.2008   
University of Tartu, Faculty of Science and Technology (old), Institute of Physics, University of Tartu, Senior Research Fellow extraordinarius (1,00)
01.03.2007–31.12.2007   
University of Tartu, Faculty of Science and Technology (old), Institute of Physics, University of Tartu, Senior Research Fellow extraordinarius (1,00)
01.01.2006–31.01.2006   
University of Tartu, Faculty of Physics and Chemistry, Institute of Environmental Physics, Research Fellow (1,00)
1985–2006   
University of Tartu, Faculty of Physics and Chemistry, Institute of Environmental Physics, Researcher (1,00)
 
 
Education
1995–2001   
doctoral student, PhD (environmental physics), University of Tartu
1994–1994   
master degree in physics, University of Tartu,
1980–1985   
diploma in physics (geophysics), University of Tartu
 
 
R&D related managerial and administrative work
2011−...   
Member of the Council of the Estonian Environmental Observatory, infrastructure object of the Estonian Research Infrastructures Roadmap
2007−...   
Organizer of the seminary in environmental physics at the Institute of Physics
2007−...   
Acting manager and head of the Laboratory of Environmental Physics, Institute of Physics, University of Tartu
2008−2018   
Member of the Scientific Council of the Institute of Physics of the University of Tartu
2004−2007   
Member of the Council of the Department of Physics of the University of Tartu
2002−2007   
Organizer of the seminary in environmental physics at the Institute of Environmental Physics

Qualifications

Academic degrees
Urmas Hõrrak, Doctor's Degree, 2001, (sup) Hannes Tammet; Jaan Salm, Air ion mobility spectrum at a rural area, University of Tartu, Faculty of Physics and Chemistry, Institute of Environmental Physics.
 
 
Honours & awards
2011, Urmas Hõrrak, Letter of thanks of the director of Tartu Observatory (9.02.2011) for the accomplishment of the European Union 7th Framwork Programme project EstSpacE at the Tartu Observatory in 2008-2011.
2003, Urmas Hõrrak, Grant of Maj and Tor Nessling Foundation. Research in the University of Helsinki
1993, Urmas Hõrrak, Letter of thanks of the Ministry of Education of Estonian Republic (30.03.1993) for the long-time active work in organization of Estonian pupils science Olympiads.
 
 
Fields of research
ETIS CLASSIFICATION: 4. Natural Sciences and Engineering; 4.2. Geosciences; CERCS CLASSIFICATION: P500 Geophysics, physical oceanography, meteorology ; SPECIFICATION: Atmospheric electricity and aerosol physics, atmospheric aerosols and air ions, dynamics of the mobility spectra of air ions, nucleation, mobility spectrometry of air ions
 
 
Additional information
Supervised (or under the supervision) post-doctoral researchers:
Dr Devandraa Siingh (PhD, Indian Institute of Tropical Meteorology, Pune, India), 12-month postdoctoral associate period (25.05.2006–19.05.2007) at the University of Tartu, as a scholar of DST of the Government of India under the program “Better Opportunities for Young Scientist in Chosen Area of Science and Technology (BOYSCAST)”. Research subject “Study of air pollution transport, atmospheric aerosol and air ion measurements at the Tahkuse station, Estonia”.

Dr Hanna Elina Manninen, post-doctoral researcher from the University of Helsinki. Scientific research topic “Connections between atmospheric electricity and climate” (Ilmakehän sähköilmiöiden ja ilmaston välinen vuorovaikutus)”. Supervisors from the University of Tartu: Urmas Hõrrak and Hannes Tammet. The project is funded by the Finnish Foundations' Post Doc Pool during the period 1.09.2012–31.08.2013.
Referee for academic degrees:
Kannosto, Jonna “Measurement of the Physical Properties of Secondary Organic Aerosol Particles”, PhD thesis, Tampere University of Technology, 14.09.2012, pre-examiner.

Wagner, Robert "On ion-induced new-particle formation: from well-defined laboratory experiments to atmospheric observations". PhD thesis pre-examinaton. Defense on 31.10.2017. University of Helsinki, Faculty of Science, Department of Physics, Atmospheric Sciences. https://helda.helsinki.fi/handle/10138/225246
http://urn.fi/URN:ISBN:978-952-7091-89-0

Organizer of the international scientific workshops:
Finnish-Estonian air ion and aerosol workshops.
7th Air ion and aerosol workshop, 21–23.08.2006, Pühajärve, Estonia.
9th Air ion and aerosol workshop, 24–26.09.2007, Pühajärve, Estonia.
11th Air ion and aerosol workshop, 8–10.09.2008, Pühajärve, Estonia
14th Air ion and aerosol workshop, 14–16.06.2010, Pühajärve, Estonia.
16th Air ion and aerosol workshop, 12–14.06.2012, Pühajärve, Estonia.
18th Air Ion and Aerosol Workshop, 2–4.06.2014, Pühajärve, Estonia.
19th Air Ion and Aerosol Workshop, 24–26.08.2015, Pühajärve, Estonia.
21th Air Ions, Clusters and Atmospheric Aerosols Workshop, 6–8.06.2017, Pühajärve, Estonia.
Principal investigator of the international scientific projects:
Project of the EU’s 6th Framework Programme “European Integrated Project on Aerosol Cloud Climate Air Quality Interactions (EUCAARI)” (duration: 2007–2010, principal investigator: Hõrrak, U., coordinator: Markku Kulmala, University of Helsinki, Finland; contribution of the University of Tartu: 938779 EEK (59 998.91 EUR)).

EU’s 7th Framework REGPOT Programme project “Expose capacity of Estonian space research and technology through high-quality partnership in Europe (ESTSPACE)” (duration: 1.03.2008–28.02.2011, principal investigator: Hõrrak, U., coordinator: Dr. Anu Reinart, Tartu Observatory, Estonia, funding of the project: 1,009,686 EUR).
Participation as workgroup leader in other larger projects:
Environmental protection and technology research and development programme (KESTA), project SLOOM12022T "Research and development in the field of biosphere and the atmosphere within Estonian Environmental Observatory" (duration: 2011–2014, principal investigator: Kaido Soosaar, workgroup leader: Urmas Hõrrak, institution: University of Tartu, funding: 757 600,23 EUR (11 853 868 EEK)).

Estonian research infrastructure roadmap project “Estonian Environmental Observatory” (2010-2015). Principal investigator: Kaido Kansi, University of Tartu, workgroup leader in the Institute of Physic: Urmas Hõrrak; Total project financing 1 961 859,00 EUR (30 696 423 EEK).
Referee for scientific journals:
Journal of Atmospheric Chemistry and Physics, Water Journal; Boreal Environment Research, Journal of Aerosol Science, Journal of Geophysical Research Atmospheres, Atmospheric Environment

Projects in progress

Completed projects

Dissertations under supervision

Supervised dissertations

Supervision of postdoctoral researchers

  • 25.05.2006−19.05.2007    Devendraa Siingh  " Study of air pollution transport, atmospheric aerosol and air ion measurements at the Tahkuse station, Estonia (Õhusaaste kauglevi uurimine, aeroioonide ja aerosoolide mõõtmised Tahkusel, Eestis)." (Indian Institute of Tropical Meteorology, Pune, India. )
  • 01.09.2012−31.08.2013    Hanna Elina Manninen  "Atmosfäärielektri ja kliima vastasmõju (Ilmakehän sähköilmiöiden ja ilmaston välinen vuorovaikutus)." (University of Helsinki. Scholar of Suomen Kulttuurirahasto.)

Publications

Category
Year
Publication
 
1.1.
2018
Größ, J.; Hamed, A.; Sonntag, A.; Spindler, G.; Manninen, H. E.; Nieminen, T.; Kulmala, M.; Hõrrak, U.; Plass-Dülmer, C.; Wiedensohler, A.; Birmili, W. (2018). Atmospheric new particle formation at the research station Melpitz, Germany: connection with gaseous precursors and meteorological parameters. Atmospheric Chemistry and Physics, 18 (3), 1835−2018.10.5194/acp-18-1835-2018.
1.1.
2018
Nieminen, Tuomo; Kerminen, Veli-Matti; Petaja, Tuukka; Aalto, Pasi P.; Arshinov, Mikhail; Asmi, Eija; Baltensperger, Urs; Beddows, David C. S.; Beukes, Johan Paul; Collins, Don; Ding, Aijun; Harrison, Roy M.; Henzing, Bas; Hooda, Rakesh; Hu, Min; Horrak, Urmas; Kivekas, Niku; Komsaare, Kaupo; Krejci, Radovan; Kristensson, Adam ... Kulmala, Markku (2018). Global analysis of continental boundary layer new particle formation based on long-term measurements. Atmospheric Chemistry and Physics, 18 (19), 14737−14756.10.5194/acp-18-14737-2018.
5.2.
2018
Tamme, K; Luts, A.; Hõrrak, U., Salm, J.; Junninen, H. (2018). Atmospheric Relevance of Laboratory Experiments on Ion Composition Based on Ion Composition Simulation. 10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA. 10th International Aerosol Conference, 207.
5.2.
2018
Lipp, Helina; Tamm, Eduard; Tamme, Kalju; Komsaare, Kaupo; Kangasluoma, Juha; Hõrrak, Urmas; Junninen, Heikki (2018). Calibration and Ambient Measurements of Sub-3 nm Aerosols. In: .10th International Aerosol Conference (IAC), America's Center, St. Louis, Missouri, 2.-7. september 2018.
5.2.
2018
Lipp, Helina; Tamm, Eduard; Tamme, Kalju; Komsaare, Kaupo; Hõrrak, Urmas; Junninen, Heikki. (2018). Calibration and Ambient Measurements of Sub-3 nm Aerosols. In: .XXII Annual Air Ion and Aerosol Workshop, Pühajärve, Estonia, 8.-9. Mai 2018.
3.4.
2017
Komsaare, Kaupo; Vana, Marko; Mirme, Sander; Palo, Maris; Luts, Aare; Tammet, Hannes; Iher, Hilja; Hõrrak, Urmas (2017). Formation events of intermediate air ions at Tahkuse Observatory in 1995-2016. Proceedings of the 20th International Conference on Nucleation and Atmospheric Aerosols: 20th International Conference on Nucleation and Atmospheric Aerosols, Helsinki, Finland, 25.-30.6.2017. Ed. Roope Halonen, Anna Nikandrova, Jenni Kontkanen, Joonas A. Enroth, Hanna Vehkamäki. Helsinki: Finnish association for aerosol research, 487−490. (REPORT SERIES IN AEROSOL SCIENCE; 200).
5.2.
2017
Noe, Steffen M.; Hõrrak, Urmas; Mirme, Sander; Kaasik, Marko; Krasnova, Alisa; Krasnov, Dmitrii; Komsaare, Kaupo; Kangur, Ahto (2017). SMEAR Estonia - air ion, aerosol and precursor gas measurements. 3rd ACTRIS-2 General Meeting and Science Meeting. Granada, Spain: ACTRIS-2, 1−1.
1.1.
2016
Luts, Aare; Hõrrak, Urmas; Salm, Jaan; Vana, Marko; Tammet, Hannes (2016). Interpretation of Atmospheric Aerosol Measurements by Means of a Numerical Simulator of New Particle Formation Events. Aerosol and Air Quality Research, 16 (4), 930−942.10.4209/aaqr.2015.08.0511.
1.1.
2016
Vana, Marko; Komsaare, Kaupo; Hõrrak, Urmas; Mirme, Sander; Nieminen, Tuomo; Kontkanen, Jenni; Manninen, Hanna E.; Petäjä, Tuukka; Noe, Steffen M.; Kulmala, Markku (2016). Characteristics of new-particle formation at three SMEAR stations. Boreal Environment Research, 21 (3), 345−362.
1.1.
2016
Kulmala, Markku; Hõrrak, Urmas; Manninen, Hanna E.; Mirme, Sander; Noppel, Madis; Lehtipalo, Katrianne; Junninen, Heikki; Vehkamäki, Hanna; Kerminen, Veli-Matti; Noe, Steffen M.; Tammet, Hannes (2016). The legacy of Finnish–Estonian air ion and aerosol workshops. Boreal Environment Research, 21 (3), 181−206.
1.1.
2016
Lappalainen, H. K.; Kerminen, V.-M.; Petäjä, T.; Kurten, T.; Baklanov, A.; Shvidenko, A.; Bäck, J.; Vihma, T.; Alekseychik, P.; Arnold, S.; Arshinov, M.; Asmi, E.; Belan, B.; Bobylev, L.; Chalov, S.; Cheng, Y.; Chubarova, N.; de Leeuw, G.; Ding, A.; Dobrolyubov, S. ... Kulmala, M. (2016). Pan-Eurasian Experiment (PEEX): towards a holistic understanding of the feedbacks and interactions in the land–atmosphere–ocean–society continuum in the northern Eurasian region. Atmospheric Chemistry and Physics, 16, 14421−14461.10.5194/acp-16-14421-2016.
3.1.
2016
Noe, Steffen M.; Krasnova, Alisa; Krasnov, Dmitrii; Niinemets, Ülo; Jõgiste, Kalev; Hõrrak, Urmas; Vana, Marko; Mirme, Sander; Komsaare, Kaupo; Kangur, Ahto (2016). Dynamics of Carbon, Nitrogen and other climate relevant trace gases measured at SMEAR Estonia. Report Series in Aerosol Sciences, 180: Proceedings of the 2nd Pan-Eurasian Experiment (PEEX) Conference and the 6th PEEX Meeting, Beijing, China, 18-20 May 2016. Ed. Hanna K. Lappalainen, Alla Borisova, Dong Liang, Joonas Enroth and Markku Kulmala. Helsinki: Finnish association for aerosol research, 354−360.
5.1.
2016
Parts, Tiia-Ene; Luts, Aare; Komsaare, Kaupo; Noppel, Madis; Hõrrak, Urmas (2016). Links between chemical composition of positive and negative air ions. European Aerosol Conference EAC 2016; Tours, September 4-9, 2016. French Society for Aerosol Research (ASFERA), P1-AAS-AAP-021.
1.1.
2015
Luts, Aare; Hõrrak, Urmas; Salm, Jaan; Vana, Marko; Tammet, Hannes (2015). A Method for Automated Estimation of Parameters Controlling Aerosol New Particle Formation. Aerosol and Air Quality Research, 15 (4), 1166−1177.10.4209/aaqr.2014.10.0232.
1.1.
2015
Noe, S. M.; Niinemets, Ü.; Krasnova, A.; Krasnov, D.; Motallebi, A.; Kängsepp, V.; Jõgiste, K.; Hõrrak, U.; Komsaare, K.; Mirme, S.; Vana, M.; Tammet, H.; Bäck, J.; Vesala, T.; Kulmala, M.; Petäjä, T.; Kangur, A. (2015). SMEAR Estonia: Perspectives of a large-scale forest ecosystem - atmosphere research infrastructure. Forestry Studies / Metsanduslikud Uurimused, 63 (1), 56−84. DOI: 10.1515/fsmu-2015-0009.
1.2.
2015
Größ, J.; Birmili, W.; Hamed, A.; Sonntag, A.; Wiedensohler, A.; Spindler, G.; Maninnen, H. E.; Nieminen, T.; Kulmala, M.; Hõrrak, U.; and Plass-Dülmer, C. (2015). Evolution of gaseous precursors and meteorological parameters during new particle formation events in the Central European boundary layer. Atmospheric Chemistry and Physics Discussions, 15 (2), 2305−2353. DOI: 10.5194/acpd-15-2305-2015.
3.4.
2015
Noe, S. M.; Kangur, A.; Hõrrak, U.; Krasnova, A.; Krasnov, D.; Cordey, H.P.E. (2015). Overview and first results from SMEAR Estonia. Report Series in Aerosol Sciences, 163: Proceedings of the 1st Pan-Eurasian Experiment (PEEX) Conference and the 5th PEEX Meeting. Ed. Kulmala,M., Zilitinkevich, S., Lappalainen, H.K:, Kyrö, E.-M., Kontkanen, J. Helsinki: Finnish association for aerosol research, 318−321.
5.2.
2015
Komsaare, Kaupo; Hõrrak, Urmas; Iher, Hilja (2015). Air ion formation events at Tahkuse Observatory, Estonia. International Baltic Earth Secretariat Publications, 5: A Doctoral Students Conference Challenges for Earth system science in the Baltic Sea region: From measurements to models. University of Tartu and Vilsandi Island, Estonia, 10 - 14 August 2015. International Baltic Earth Secretariat Helmholtz-Zentrum Geesthacht GmbH Max-Planck-Str. 1 D-21502 G, 22−23.
5.2.
2015
Hõrrak, U.; Salm, J.; Komsaare, K.; Luts, A.; Vana, M.; Tammet, H. (2015). Problems with ionization rate in the research of atmospheric aerosols. 2015 European Aerosol Conference (EAC 2015), Milano, Italy, September 6-11, 2015.
1.1.
2014
Tammet, H.; Komsaare, K.; Hõrrak, U. (2014). Intermediate ions in the atmosphere. Atmospheric Research, 135, 263−273.10.1016/j.atmosres.2012.09.009.
3.4.
2014
Hõrrak, Urmas; Salm, Jaan; Komsaare, Kaupo; Luts, Aare; Vana, Marko; Tammet, Hannes. (2014). Problem of Ionization Rate in the Research of Atmospheric Aerosols. In: (1−6).XV International Conference on Atmospheric Electricity, 15-20 June 2014, Norman, Oklahoma, U.S.A. .
5.2.
2014
Laan, Birgit; Komsaare, Kaupo; Kaasik, Marko; Hõrrak, Urmas (2014). Estimating the origin of background aerosol pollution in Estonia. Proceedings of Abstracts 9th International Conference on Air Quality Science and Application: 9th International Conference on Air Quality Science and Application Garmisch-Partenkirchen, 24-28 March 2014. Ed. Mitto, Tonio; Fallmann, Joachim; Mikolajczyk, Urszula; Suppan, Peter; Singh, Vikas; Sokhi, Ranjeet. 247.
5.2.
2014
Noe, Steffen M.; Niinemets, Ülo; Kangur, Ahto; Hõrrak, Urmas; Soosaar, Kaido; Mander, Ülo (2014). Interdisciplinary research at the SMEAR Estonia station. Geophysical Research Abstracts: EGU General Assembly 2014. Vienna,. (Geophysical Research Abstracts; 16).
5.2.
2014
Parts, T.-E.; Luts, A.; Komsaare, K.; Noppel, M.; Hõrrak, U. (2014). On the chemical composition of new particles in the atmosphere. 123−123.
1.1.
2013
Tammet, H.; Komsaare, K.; Hõrrak, U. (2013). Estimating neutral nanoparticle steady-state size distribution and growth according to measurements of intermediate air ions. Atmospheric Chemistry and Physics, 13 (18), 9597−9603.10.5194/acp-13-9597-2013.
3.1.
2013
Manninen, Hanna E.; Tammet, Hannes; Makela, Antti; Haapalainen, Jussi; Mirme, Sander; Nieminen, Tuomo; Franchin, Alessandro; Petaja, Tuukka; Kulmala, Markku; Hõrrak, Urmas (2013). Atmospheric Electricity and Aerosol-Cloud Interactions in Earth's Atmosphere. 1527: 19th International Conference on Nucleation and Atmospheric Aerosols (ICNAA), Colorado State Univ, Ctr Arts, Fort Collins, CO, JUN 23-28, 2013. 790−792. (AIP Conference Proceedings).10.1063/1.4803390.
5.2.
2013
Parts, T.-E.; Luts, A. ; Komsaare, K.; Noppel, M. ; Hõrrak, U. (2013). On the enigma of new particle formation in the atmosphere. 2013 European Aerosol Conference, Prague, 1nd-6th September 2013.
3.2.
2012
Iher, Hilja; Komsaare, Kaupo; Tamm, Eduard; Hõrrak, Urmas (2012). Õhukvaliteedi seisund Tahkuse jaama seiretulemuste järgi. Kait Antso (Toim.). Eesti keskkonnaseire 2007 – 2010 (19−22).. Tallinn: Keskkonnateabe Keskus.
3.2.
2012
Luts, Aare; Hõrrak, Urmas; Parts, Tiia-Ene (2012). Õhu negatiivsete ioonide koostise üks uuemaid uurimismeetodeid. Anna Aret, Helle Kaasik, Piret Kuusk (_EditorsAbbr). EESTI Füüsika seltsi aastaraamat 2011 (11−14).. Tartu: Eesti Füüsika Selts.
5.2.
2012
Größ, Johannes; Birmili, Wolfram; Hamed, Amar; Sonntag, André; Wiedensohler, Alfred; Spindler, Gerald; Maninnen, Hanna Elina; Kulmala, Markku; Hõrrak, Urmas; Plass-Dülmer, Christian. (2012). Atmospheric new particle formation in the Central European boundary layer: A long-term study using Neutral Cluster Air Ion Spectrometer (NAIS) data. European Aerosol Conference EAC- 2012, Granada, 2-7 September 2012. P191.
5.2.
2012
Parts, Tiia-Ene; Noppel, Madis; Luts, Aare; Komsaare, Kaupo; Hõrrak, Urmas (2012). Spectra of positive air ions up to 40 nm as a function of selected trace gases. 2012 European Aerosol Conference, Granada, 2nd-9th September.
5.2.
2012
Salm, J.; Luts, A.; Hõrrak, U.; Vana, M.; Tammet, H. (2012). Simulation of Aerosol Nucleation Bursts: A Case Study. 2012 European Aerosol Conference, Granada, 2nd-9th September 2012.
5.2.
2012
Salm, J.; Intra, P.; Yawootti, A.; Tippayawong, N.; Hõrrak, U. (2012). Influence of Turbulent Diffusion in an Electrical Mobility Spectrometer. 2012 European Aerosol Conference, Granada, 2nd-9th September 2012.
6.3.
2012
Hõrrak, U.; Salm, J.; Tammet, H. (2012). Laboratory of Environmental Physics, Institute of Physics, University of Tartu, Estonia. Newsletter on Atmospheric Electricity, 23 (1), 15−16.
1.1.
2011
Luts, A.; Parts, T.-E.; Hõrrak, U.; Junninen, H.; Kulmala, M. (2011). Composition of negative air ions as a function of ion age and selected trace gases: Mass- and mobility distribution. Journal of Aerosol Science, 42 (11), 820−838.10.1016/j.jaerosci.2011.07.007.
1.1.
2011
Gagné, S.; Lehtipalo, K.; Manninen, H. E.; Nieminen, T.; Schobesberger, S.; Franchin, A.; Yli-Juuti, T.; Boulon, J.; Sonntag, A.; Mirme, S.; Mirme, A.; Hõrrak, U.; Petäjä, T.; Asmi, E.; Kulmala, M. (2011). Intercomparison of air ion spectrometers: an evaluation of results in varying conditions. Atmospheric Measurement Techniques Discussions, 4 (5), 805−822.10.5194/amt-4-805-2011.
1.1.
2011
Hirsikko, A.; Nieminen, T.; Gagné, S.; Lehtipalo, K.; Manninen, H. E.; Ehn, M.; Hõrrak, U.; Kerminen, V.-M.; Laakso, L.; McMurry, P. H.; Mirme, A.; Mirme, S.; Petäjä, T.; Tammet, H.; Vakkari, V.; Vana, M.; Kulmala, M. (2011). Atmospheric ions and nucleation: a review of observations. Atmospheric Chemistry and Physics, 11 (2), 767−798.10.5194/acp-11-767-2011.
1.1.
2011
Luts, A.; Komsaare, K.; Parts, T.-E.; Hõrrak, U. (2011). Links between two different types of spectra of charged nanometer aerosol particles. Atmospheric Research, 101 (3), 527−538.10.1016/j.atmosres.2010.10.025.
1.1.
2011
Ehn, M.; Junninen, H.; Schobesberger, S.; Manninen, H.E.; Franchin, A.; Sipilä, M.; Petäjä, T.; Kerminen, V.-M.; Tammet, H.; Mirme, A.; Mirme, S.; Hõrrak, U.; Kulmala, M.; Worsnop, D.R. (2011). An instrumental comparison of mobility and mass measurements of atmospheric small ions. Aerosol Science and Technology, 45 (4), 522−532.10.1080/02786826.2010.547890.
1.1.
2011
Kaasik, M.; Sofiev, M.; Prank, M.; Ruuskanen, T.; Kukkonen, J.; Hõrrak, U.; Kulmala, M. (2011). Geographical origin of aerosol particles observed during the LAPBIAT measurement campaign in spring 2003 in Finnish Lapland. Boreal Environment Research, 16 (1), 15−35.
1.1.
2011
Kulmala, M.; Asmi, A.; Lappalainen, H. K.; Baltensperger, U.; Brenguier, J.-L.; Facchini, M. C.; Hansson, H.-C.; Hov, Ø.; O'Dowd, C. D.; Pöschl, U.; Wiedensohler, A.; Boers, R.; Boucher, O.; de Leeuw, G.; Denier van der Gon, H. A. C.; Feichter, J.; Krejci, R.; Laj, P.; Lihavainen, H.; Lohmann, U. ... Pandis, S. N. (2011). General overview: European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI) – integrating aerosol research from nano to global scales. Atmospheric Chemistry and Physics, 11 (24), 13061−13143.10.5194/acp-11-13061-2011.
1.1.
2011
Yli-Juuti, T.; Nieminen, T.; Hirsikko, A.; Aalto, P. P.; Asmi, E.; Hõrrak, U.; Manninen, H. E.; Patokoski, J.; Dal Maso, M.; Petäjä, T.; Rinne, J.; Kulmala, M.; Riipinen, I. (2011). Growth rates of nucleation mode particles in Hyytiälä during 2003−2009: variation with particle size, season, data analysis method and ambient conditions. Atmospheric Chemistry and Physics, 11 (24), 12865−12886.10.5194/acp-11-12865-2011.
5.2.
2011
Salm, J.; Hõrrak, U. (2011). Diffusion of charged particles in a DMA with inclined electric field and with a particle collector in gas outlet. 2011 European Aerosol Conference, Manchester, 4th-9th September 2011. 718.
5.2.
2011
Luts, A.; Parts, T.; Hõrrak, U. (2011). Gaseous iodine as a substantial cause of new specific air ions. 2011 European Aerosol Conference, Manchester, 4th-9th September 2011. x, 358.
5.2.
2011
Parts, T.; Luts, A.; Hõrrak, U. (2011). Diethylamine and new charged particles formation. 2011 European Aerosol Conference, Manchester, 4th-9th September 2011. x, 360.
5.2.
2011
Hõrrak, U.; Komsaare, K.; Tammet, H. (2011). Intermediate Ions in the Atmosphere. XIV International Conference on Atmospheric Electricity, Abstracts: XIV International Conference on Atmospheric Electricity, Rio de Janeiro, Brazil, August 07-12, 2011. Rio de Janeiro, Brazil: International Commission on Atmospheric Electricity, 313−313.
1.1.
2010
Paasonen, P.; Nieminen, T., Asmi, E., Manninen, H. E.; Petäjä, T.; Plass-Dülmer, C.; Flentje, H.; Birmili, W.; Wiedensohler, A.; Hõrrak, U.; Metzger, A.; Hamed, A.; Laaksonen, A.; Facchini, M. C.; Kerminen, V.-M.; Kulmala, M. (2010). On the roles of sulphuric acid and low-volatility organic vapours in the initial steps of atmospheric new particle formation. Atmospheric Chemistry and Physics, 10 (22), 11223−11242.10.5194/acp-10-11223-2010.
1.1.
2010
Kerminen, V.-M.; Petäjä, T.; Manninen, H. E.; Paasonen, P.; Nieminen, T.; Sipilä, M.; Junninen, H.; Ehn, M.; Gagné, S.; Laakso, L.; Riipinen, I.; Vehkamäki, H.; Kurten, T.; Ortega, I. K.; Dal Maso, M.; Brus, D.; Hyvärinen, A.; Lihavainen, H.; Leppä, J.; Lehtinen, K. E. J. ... Kulmala, M. (2010). Atmospheric nucleation: highlights of the EUCAARI project and future directions. Atmospheric Chemistry and Physics, 10 (22), 10829−10848.10.5194/acp-10-10829-2010.
1.1.
2010
Manninen, H. E.; Nieminen, T.; Asmi, E., Gagné, S.; Häkkinen, S.; Lehtipalo, K.; Aalto, P.; Vana, M.; Mirme, A.; Mirme, S.; Hõrrak, U.; Plass-Dülmer, C.; Stange, G; Kiss, G.; Hoffer, A.; Törö, N.; Moerman, M.; Henzing, B.; de Leeuw, G.; Brinkenberg, M.; Kouvarakis, G. N. ... Kulmala, M. (2010). EUCAARI ion spectrometer measurements at 12 European sites – analysis of new particle formation events. Atmospheric Chemistry and Physics, 10, 7907−7927.10.5194/acp-10-7907-2010.
1.1.
2010
Kulmala, M.; Riipinen, I.; Nieminen, T.; Hulkkonen, M.; Sogacheva, L.; Manninen, H. E., Paasonen; P., Petäjä; T., Dal Maso; M., Aalto, P. P.; Viljanen, A.; Usoskin, I.; Vainio, R.; Mirme, S.; Mirme, A.; Minikin, A.; Petzold, A.; Hõrrak, U., Plaß-Dülmer, C.; Birmili, W.; Kerminen, V.-M. (2010). Atmospheric data over a solar cycle: no connection between galactic cosmic rays and new particle formation. Atmospheric Chemistry and Physics, 10 (4), 1885−1898.
1.1.
2010
Mirme, S.; Mirme, A.; Minikin, A.; Petzold, A.; Hõrrak, U.; Kerminen, V. -M.; Kulmala, M. (2010). Atmospheric sub-3 nm particles at high altitudes. Atmospheric Chemistry and Physics, 10 (2), 437−451.
3.4.
2010
Manninen, H. E.; Nieminen, T.; Asmi, E.; Gagné, S.; Sipilä, M.; Häkkinen, S.; Laakso, L.; Vana, M.; Mirme, A.; Mirme, S.; Hõrrak, U.; Plass-Dülmer, C.; Stange, G.; Kiss, G.; Hoffer, A.; Moerman, M.; Brinkenberg, M.; Kouvarakis, G. N.; Bougiatioti, K.; O’Dowd, C. ... Kulmala, M. (2010). Cluster spectrometers in long-term field measurements. Proceedings of 2009 EUCAARI Annual Meeting Stockholm 17.-20.11.2009, 107: EUCAARI Annual Meeting Stockholm 17.-20.11.2009. Ed. Lappalainen, H. K.; Asmi, A.; Nieminen, T.; Kulmala, M. Helsinki: University of Helsinki Press, 258−260. (Report Series in Aerosol Science).
3.4.
2010
Hirsikko, A.; Nieminen, T.; Kulmala, M.; Kerminen, V.-M.; Manninen, H. E.; Gagné, S.; Lehtipalo, K.; Laakso, L.; Vana, M.; Hõrrak, U.; Mirme, A.; Mirme, S.; Tammet, H. (2010). Overview on small ions in the atmosphere. Proceedings of the Finnish Center of Excellence and Graduate School in Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change, Annual Workshop 17.-19.5.2010, 109: Finnish Center of Excellence and Graduate School in Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change, Annual Workshop; Kuopio, Finland; 17.-19.5.2010. Ed. Kulmala, M.; Bäck, J.; Nieminen, T. Helsinki: University of Helsinki Press,. (Report Series in Aerosol Science).
3.4.
2010
Kerminen, V-M.; Brus, D.; Hyvärinen, A.; Sipilä, M.; Manninen, H.; Nieminen, T.; Paasonen, P.; Kurten, T.; Vehkamäki, H.; Mirme, A.; Mirme, S.; Horrak, U.; Berndt, T.; Stratmann, F.; Birmili, W.; Minikin, A.; Petzold, A.; Plass-Dülmer, C.; Kulmala, M. (2010). WP1.1: NUCLEATION. Proceedings of 2009 EUCAARI Annual Meeting Stockholm 17.-20.11.2009, 107: EUCAARI Annual Meeting; Stockholm; 17.-20.11.2009. _EditorsAbbr Lappalainen, H. K.; Asmi, A.; Nieminen, T.; Kulmala, M. Helsinki: University of Helsinki Press, 18−24. (Report Series in Aerosol Science).
5.2.
2010
Gagné, S.; Lehtipalo, K.; Manninen, H.E.; Nieminen, T.; Franchin, A.; Schobesberger, S.; Yli-Juuti, T.; Mirme, A.; Mirme, S.; Hõrrak, U.; Asmi, E.; Petäjä, T.; Kulmala, M. (2010). Intercomparison of air ion spectrometers: a baseline for data analysis. International Aerosol Conference 2010; Helsinki, Finland, 29.08.-03.09.2010. Helsinki, 73.
5.2.
2010
Manninen, Hanna E.; Nieminen, Tuomo; Asmi, Eija; Gagné, Stéphanie; Häkkinen, Silja; Hõrrak, Urmas; Plass-Dülmer, Christian; Kiss, Gyula; O`Dowd, Colin D.; Svenningsson, Birgitta; Baltensperger, Urs; Mihalopoulos, Nikos; Decesari, Stefano; Birmili, Wolfram; Boulon, Julien; Sellegri, Karine; Laaksonen, Ari; Laakso, Lauri; Petäjä, Tuukka; Kerminen, Veli-Matti ... Kulmala, Markku (2010). Analysis of particle formation and growth events at different EUCAARI sites. International Aerosol Conference 2010; Helsinki, Finland; 29.08.-03.09.2010. Helsinki, 74.
5.2.
2010
Paasonen, Pauli; Nieminen, Tuomo; Asmi, Eija; Petäjä, Tuukka; Plass-Dülmer, Christian; Birmili, Wolfram; Hõrrak, Urmas; Kerminen, Veli-Matti; Kulmala, Markku (2010). On the roles of sulphuric acid and organic vapours in atmospheric nucleation. International Aerosol Conference 2010; Helsinki, Finland, 29.08.-03.09.2010. 747.
5.2.
2010
Hirsikko, A.; Kulmala, M.; Nieminen, T.; Manninen, H. E.; Gagné, S.; Lehtipalo, K.; Laakso, L.; Vana, M.; Hõrrak, U.; Mirme, A.; Mirme, S.; Tammet, H.; Kerminen, V.-M. (2010). Overview on the observations of small ions in the atmosphere. International Aerosol Conference 2010; Helsinki, Finland; 29.08 - 03.09.2010. 746.
5.2.
2010
Eller, M.; Mirme, S.; Hõrrak, U.; Mirme, A. (2010). Variation of aerosol and air ion distribution during a new-years celebration. International Aerosol Conference, Helsinki, 29. August - 3. September 2010. 1131.
5.2.
2010
Luts, A.; Komsaare, K.; Parts, T.-E.; Hõrrak, U.; Tammet, H. (2010). Effect of ambient air gas concentrations on the shape of air ion mobility spectra. International Aerosol Conference; Helsinki, Finland; August 29-September 3 2010. Helsinki, P1D10.
5.2.
2010
Parts, Tiia-Ene; Luts, Aare; Hõrrak, Urmas (2010). On the first steps from cluster ions to aerosol particles. International Aerosol Conference 2010; Helsinki, Finland; August 29-September 3 2010. Helsinki, P3W55.
1.1.
2009
Manninen, H. E.; Petäjä, T.; Asmi, E.; Riipinen, I.; Nieminen, T.; Mikkilä, J.; Hõrrak, U.; Mirme, A.; Mirme, S.; Laakso, L.; Kerminen, V.-M.; Kulmala, M. (2009). Long-term field measurements of charged and neutral clusters using Neutral cluster and Air Ion Spectrometer (NAIS). Boreal Environment Research, 14, 591−605.
1.1.
2009
Salm, J.; Hõrrak, U. (2009). Diffusion Distortions in a Differential Mobility Analyzer with Inclined Electric Field. Aerosol Science and Technology, 43 (3), 227−231. DOI: 10.1080/02786820802587904.
1.1.
2009
Tammet, H.; Hõrrak, U.; Kulmala, M. (2009). Negatively charged nanoparticles produced by splashing of water. Atmospheric Chemistry and Physics, 9 (2), 357−367.
3.2.
2009
Luts, A.; Parts, T.-E.; Hõrrak, U.; Komsaare, K. (2009). Links Between Two Different Types Spectra of Charged Nanometer Aerosol Particles. In: Jirˇi Smolik, Colin O'Dowd (Ed.). Nucleation and Atmospheric Aerosols. 18th International Conference (711−714).. Prague: Institute of Chemical Process Fundamentals, Academy of Sciences of Czech Republic.
3.4.
2009
Manninen, H. E.; Gagné, S.; Asmi, E.; Sipilä, M.; Riipinen, I.; Laakso, L.; Vana, M.; Mirme, A.; Mirme, S.; Hõrrak, U.; Plass-Dülmer, C.; Stange, G.; Kiss, G.; Hoffer, A.; Moerman, M.; Brinkenberg, M.; Kouvarakis, G. N.; Bougiatioti, K.; O’Dowd, C.; Ceburnis, D. ... Kulmala, M. (2009). Continuous Field Measurements Using Cluster Spectrometers within the EUCAARI Project. 18th International Conference on Nucleation and Atmospheric Aerosols, Prague, Czech Republic, 10 – 14 August 2009. Ed. J. Smolik, C. O’Dowd. Prague: Institute of Chemical Process Fundamentals ASCR, 355−358.
3.4.
2009
Kerminen, V.-M. ; Lihavainen, H.; Brus, D.; Asmi, E.; Sipilä, M.; Manninen, H. E.; Kurten, T.; Vehkamäki, H.; Ortega, I. K.; Mirme, A.; Mirme, S.; Uin, J. ; Hõrrak, U.; Berndt, T.; Stratmann, F.; Lehtinen, K.; Baltensperger, U. ; Laaksonen, A. ; Kulmala, M. (2009). Nucleation Studies within the EUCAARI Project. 18th International Conference on Nucleation and Atmospheric Aerosols, Prague, Czech Republic, 10 – 14 August 2009.. _EditorsAbbr J. Smolik, C. O’Dowd. Prague: Institute of Chemical Process Fundamentals ASCR, 322−325.
5.2.
2009
Manninen, H. E.; Gagné, S.; Asmi, E.; Sipilä, M.; Riipinen, I.; Laakso, L.; Vana, M.; Mirme, A.; Mirme, S.; Hõrrak, U.; Plass-Dülmer, C.; Stange, G.; Kiss, G.; Hoffer, A.; Moerman, M.; Brinkenberg, M.; Kouvarakis, G. N.; Bougiatioti, K.; O’Dowd, C.; Ceburnis, D. ... Kulmala, M. (2009). Cluster Spectrometers in intensive field measurements within the EUCAARI Project. European Aerosol Conference 2009, Karlsruhe, Germany, 6 - 11 September 2009. T041A13.
5.2.
2009
Komsaare, K.; Hõrrak, U.; Tammet, H. (2009). Classification of intermediate air ion formation events at urban area. European Aerosol Conference 2009: Karlsruhe, September 6-11, 2009. Karlsruhe, T041A19.
5.2.
2009
Parts, T.-E.; Luts, A.; Hõrrak, U.; Komsaare, K. (2009). Acetonitrile and new charged clusters formation. European Aerosol Conference 2009: Karlsruhe, September 6-11, 2009. Karlsruhe, T027A02.
1.1.
2008
Kulmala, M.; Kerminen, V.-M.; Laaksonen, A.; Riipinen, I.; Sipilä, M.; Ruuskanen, T. M.; Sogacheva, L.; Hari, P.; Bäck, J.; Lehtinen, K. E. J.; Viisanen, Y.; Bilde, M.; Svenningsson, B.; Lazaridis, M.; Tørseth, K.; Tunved, P.; Nilsson, E. D.; Pryor, S.; Sørensen, L.-L.; Hõrrak, U. ... Hansson, H.-C. (2008). Overview of the biosphere–aerosol–cloud–climate interactions (BACCI) studies. Tellus. Series B: Chemical and Physical Meteorology, 60B (3), 300−317. DOI: 10.1111/j.1600-0889.2008.00354.x.
1.1.
2008
Hõrrak, U.; Aalto, P.P.; Salm, J.; Komsaare, K.; Tammet, H.; Mäkelä, J.M.; Laakso, L.; Kulmala, M. (2008). Variation and balance of positive air ion concentrations in a boreal forest. Atmospheric Chemistry and Physics, 8, 655−675.
1.1.
2008
Suni, T.; Kulmala, M.; Hirsikko, A.; Bergman, T.; Laakso, L.; Aalto, P. P.; Leuning, R.; Cleugh, H.; Zegelin, S.; Hughes, D.; van Gorsel, E.; Kitchen, M.; Vana, M.; Hõrrak, U.; Mirme, S.; Mirme, A.; Sevanto, S; Twining, J.; Tadros, C. (2008). Formation and characteristics of ions and charged aerosol particles in a native Australian Eucalypt forest. Atmospheric Chemistry and Physics, 8, 129−139.
3.2.
2008
Kulmala, M.; Kerminen, V.-M.; Laaksonen, A.; Riipinen, I.; Sipilä, M.; Ruuskanen, T.M.; Kurtén, T.; Lauri, A.; Sogacheva, L.; Hari, P.; Bäck, J.; Lihavainen, H.; Lehtinen, K.E.J.; Hakola, H.; Viisanen, Y.; Bilde, M.; Svenningsson, B.; Lazaridis, M.; Torseth, K.; Yttri, K.E. ... Hansson, H.-C. (2008). Studies on Biosphere-Aerosol-Cloud-Climate Interactions within BACCI. In: Kulmala, M; Bäck, L; Salonen, M. (_EditorsAbbr). Proceedings of the Nordic Centers of Excellence BACCI (Biosphere-Atmosphere-Cloud-Climate Interactions) and CBACCI (Carbon-BACCI) Activities in 2003-2007. (5−32).. Helsinki: Finnish association for aerosol research. (Report Series in Aerosol Science ; 92).
3.4.
2008
Manninen, H.; Gagné, S.; Asmi, E.; Sipilä, M.; Riipinen, I.; Laakso, L.; Vana, M.; Mirme, A.; Mirme, S.; Hõrrak, U.; Plass-Dülmer, C.; Stange, G.; Kiss, G.; Hoffer, A.; Moerman, M.; Brinkenberg, M.; Kouvarakis, G.N.; Bougiatioti, K.; O'Dowd, C.; Ceburnis, D. ... Kulmala, M. (2008). Cluster and ion spectrometers measuring in 13 EUCAARI field sites. Proceedings of 2008 EUCAARI Annual Meeting, Helsinki 17-21.11.2008.. Ed. Lappalainen, H.K.; Asmi, A; Nieminen, T.; Kulmala, M. Helsinki: University of Helsinki Press, 145−149. (Report Series in Aerosol Science; 99).
3.4.
2008
Kerminen, V-M.; Asmi, E.; Brus, D.; Sipilä, M.; Manninen, H.; Kurtén, T.; Vehkamäki, H.; Ortega, I.; Mirme, A.; Mirme, S.; Uin, J.; Hõrrak, U.; Berndt, T.; Stratmann, F.; Laaksonen, A.; Kulmala, M. (2008). 1. Emission and formation element. WP1.1: Nucleation (EUCAARI work package abstracts). Proceedings of 2008 EUCAARI Annual Meeting, Helsinki 17-21.11.2008.. _EditorsAbbr Lappalainen, H.K.; Asmi, A; Nieminen, T.; Kulmala, M. Helsinki: Finnish association for aerosol research, 11−15. (Report Series in Aerosol Science; 99).
5.2.
2008
Salm, J.; Hõrrak, U. (2008). Diffusion of charged particles in a DMA with inclined electric field: Simplification of equations, The European Aerosol Conference 2008, Thessaloniki, Abstract T04A065P. European Aerosol Conference; Thessaloniki, Greece; 24-29 August 2008.
1.1.
2007
Komppula, M.; Vana, M.; Kerminen, V.-M.; Lihavainen, H.; Viisanen, Y.; Hõrrak, U.; Komsaare, K.; Tamm, E.; Hirsikko, A.; Laakso, L.; Kulmala, M. (2007). Size distributions of atmospheric ions in the Baltic Sea region. Boreal Environment Research, 12 (3), 323−336.
1.1.
2007
Ruuskanen, T.M.; Kaasik, M.; Aalto, P.P.; Hõrrak, U.; Vana, M.; Mårtensson, E.M.; Yoon, Y.J.; Keronen, P.; Mordas, G.; Ceburnis, D.; Nilsson, E.D.; O’Dowd, C.; Noppel, M.; Alliksaar, T.; Ivask, J.; Sofiev, M.; Prank, M.; Kulmala, M. (2007). Concentrations and fluxes of aerosol particles during the LAPBIAT measurement campaign in Värriö field station. Atmospheric Chemistry and Physics, 7 (14), 3683−3700.
1.1.
2007
Hirsikko, A.; Bergman, T.; Laakso, L.; Dal Maso, M.; Riipinen, I.; Hõrrak, U.; Kulmala, M. (2007). Identification and classification of the formation of intermediate ions measured in boreal forest. Atmospheric Chemistry and Physics, 7, 201−210.
3.1.
2007
Suni, T.; Kulmala, M.; Sogacheva, L.; Hirsikko, A.; Bergman, T.; Aalto, P.; Vana, M.; Hõrrak, U.; Mirme, S.; Mirme, A.; Laakso, L.; Dal Maso, M.; Leuning, R.; Cleugh, H.; Zegelin, S.; Hughes, D.; Hurley, R.; van Gorsel, E.; Kitchen, M.; Keywood, M. ... Paatero, J. (2007). Ions and charged aerosol particles in a native Australian eucalypt forest. In: O'Dowd, C.; Wagner, P. (Ed.). Nucleation and Atmospheric Aerosols; 17th International Conference; Galway, Ireland, 2007 (902−905).. Springer.
3.4.
2007
Komsaare, K.; Hõrrak, U.; Tammet, H.; Siingh, D.; Vana, M.; Hirsikko, A.; Kulmala, M. (2007). Classification of intermediate air ion formation events at Tahkuse observatory. Proceedings of the 13th International Conference on Atmospheric Electricity, 1. Beijing: CAS, 116−119.
5.2.
2007
Komppula, M.; Vana, M.; Kerminen, V.-M.; Lihavainen, H.; Viisanen, Y.; Hõrrak, U.; Komsaare, K.; Tamm, E.; A. Hirsikko, L. Laakso, L.; Kulmala, M. (2007). Size distribution of atmospheric ions in Baltic Sea region. European Aerosol Conference 2007, Salzburg, 9.-14.09.2007, Abstract T13A096.
5.2.
2007
Salm, J.; Hõrrak, U. (2007). Diffusion of charged particles in a DMA with inclined electric field. European Aerosol Conference 2007, Salzburg, Abstract T02A009.
5.2.
2007
Komsaare, K.; Siingh, D.; Mirme, A.; Hõrrak, U. (2007). Overview of nucleation events based on air ion measurements at Tahkuse observatory. European Aerosol Conference 2007, Salzburg, Abstract T13A166.
1.1.
2006
Tammet, H.; Hõrrak, U.; Laakso, L.; Kulmala, M. (2006). Factors of air ion balance in a coniferous forest according to measurements in Hyytiälä, Finland. Atmospheric Chemistry and Physics, 6, 3377−3390.
1.1.
2006
Vana, M.; Tamm, E.; Hõrrak, U.; Mirme, A.; Tammet, H.; Laakso, L.; Aalto, P.P.; Kulmala, M. (2006). Charging state of atmospheric nanoparticles during the nucleation burst events. Atmospheric Research, 82, 536−546. DOI: 10.1016/j.atmosres.2006.02.010.
1.3.
2006
Hirsikko, A.; Laakso, L.; Bergman, T.; Petäjä, T.; Gagne, S.; Vana, M.; Hõrrak, U.; Aalto, P.; Mirme, A.; Tammet, H.; Kulmala, M. (2006). Air ion and aerosol particle measurements and the formation of new particles. Report Series in Aerosol Science, 80, 50−53.
1.3.
2006
Hõrrak, U.; Tammet, H.; Aalto, P.P.; Vana, M.; Hirsikko, A.; Laakso, L.; Kulmala, M. (2006). Formation of Charged Nanometer Aerosol Particles Associated with Rainfall: Atmospheric Measurements and Lab Experiment. Report Series in Aerosol Science, 81A, 180−185.
3.2.
2006
Hirsikko, A.; Bergman, T.; Laakso, L.; Dal Maso, M.; Riipinen, I.; Hõrrak, U.; Kulmala, M. (2006). Observations of charged aerosol particles in boreal forest during 21 months. In: Kulmala, M., Lindroth A., Ruuskanen, T. (_EditorsAbbr). Proceedings of BACCI, NECC and FCoE activities (176−179).. Helsinki: Finnish association for aerosol research. (Report Series in Aerosol Science 81A).
1.1.
2005
Hirsikko, A.; Laakso, L.; Horrak, U.; Aalto, P.P.; Kerminen, V.M.; Kulmala, M. (2005). Annual and size dependent variation of growth rates and ion concentrations in boreal forest. Boreal Environment Research, 10 (5), 357−369.
1.2.
2005
Hõrrak, U.; Aalto, P.P.; Salm, J.; Mäkelä, J.M.; Laakso, L.; Kulmala, M. (2005). Characterization of air ions in boreal forest air during Biofor III campaign. Atmospheric Chemistry and Physics Discussions, 5 (3), 2749−2790.
3.2.
2005
Hõrrak, U.; Aalto, P.; Salm, J.; Vana, M.; Hirsikko, A.; Laakso, L.; Kulmala, M. (2005). Estimation of the ionization rate from air ion and aerosol particle measurements at boreal forest. In: Kulmala, M.; Ruuskanen, T. (Ed.). Research Unit on Physics, Chemistry and Biology of Atmospheric Composition and Climate Change: III Progress Report and Proceedings of Seminar (91−96).. Helsinki: Finnish association for aerosol research. (Report series in aerosol science; 73).
3.2.
2005
Hirsikko, A; Laakso, L.; Hõrrak, U.; Aalto, P.P.; Kulmala, M. (2005). Growth rates of air ions and particles at SMEAR II. In: Report Series in Aerosol Science (84−86).. Helsinki: Finnish association for aerosol research.
3.2.
2005
Hirsikko, A; Mordas, G.; Aalto, P.P.; Mirme, A.; Hõrrak, U.; Kulmala, M. (2005). Calibration of the air ion spectrometer. In: Report Series in Aerosol Science (87−90).. Helsinki: Finnish association for aerosol research.
3.2.
2005
Vana, M.; Noppel, M.; Hõrrak, U.; Ruuskanen, T.; Aalto, P.P.; Kulmala, M. (2005). Characteristics of the nucleation burst events during LAPBIAT measurement campaign. In: Report Series in Aerosol Science (317−321).. Helsinki: Finnish association for aerosol research.
5.2.
2005
Hirsikko, A; Mordas, G.; Aalto, P.P.; Mirme, A.; Hõrrak, U.; Kulmala, M. (2005). Calibration and testing of Air Ion Spectrometer. European Aerosol Conference 2005; Ghent, Belgium; 28 August - 2 September 2005. _EditorsAbbr Maenhaut, W. Ghent, Belgium, 436.
5.2.
2005
Hirsikko, A; Laakso, L.; Hõrrak, U.; Aalto, P.P.; Kulmala, M. (2005). Growth rates of aerosol particles and ions in boreal forest. European Aerosol Conference 2005, 28 August - 2 September 2005, Ghent, Belgium. _EditorsAbbr W. Maenhaut. Ghent, Belgium, 485.
5.2.
2005
Vana, M.; Noppel, M.; Hõrrak, U.; Ruuskanen, T.; Aalto, P.P.; Kulmala, M. (2005). Formation and growth events of atmospheric nanoparticles at Värriö research station during LAPBIAT measurement campaign. European Aerosol Conference 2005; Ghent, Belgium; 28 August - 2 September 2005. Ed. Maenhaut, W. Ghent, Belgium, 488.
5.2.
2005
Hõrrak, U.; Tammet, H.; Aalto, P.P.; Vana, M.; Hirsikko, A; Laakso, L.; Kulmala, M. (2005). Formation of charged nanometer aerosol particles associated with rainfall. European Aerosol Conference 2005; Ghent, Belgium; 28 August - 2 September 2005. Ed. Maenhaut, W. Ghent, Belgium, 606.
1.1.
2004
Laakso, L.; Petäjä, T.; Lehtinen, KEJ.; Kulmala, M.; Paatero, J.; Hõrrak, U.; Tammet, H.; Joutsensaari, J. (2004). Ion production rate in a boreal forest based on ion, particle and radiation measurements. Atmospheric Chemistry and Physics, 4, 1933−1943.
1.1.
2004
Laakso, L.; Anttila, T.; Lehtinen, K.E.J.; Aalto, P.P.; Kulmala, M.; Hõrrak, U.; Paatero, J.; Hanke, M.; Arnold, F. (2004). Kinetic nucleation and ions in boreal forest particle formation events. Atmospheric Chemistry and Physics, 4, 2353−2366.
1.1.
2004
Kulmala, M.; Laakso, L.; Lehtinen, KEJ.; Riipinen, I.; Dal Maso, M.; Anttila, T.; Kerminen, VM.; Horrak, U.; Vana, M.; Tammet, H. (2004). Initial steps of aerosol growth. Atmospheric Chemistry and Physics, 4, 2553−2560.
1.1.
2004
Vana, M.; Kulmala, M.; Dal Maso, M.; Horrak, U.; Tamm, E. (2004). Comparative study of nucleation mode aerosol particles and intermediate air ions formation events at three sites. Journal of Geophysical Research-Atmospheres, 109, -.
3.1.
2004
Laakso, L.; Anttila, T.; Lehtinen, K.; Hõrrak, U.; Kulmala, M. (2004). Kinetic nucleation and ions in boreal forests. Abstracts of the European Aerosol Conference 2004, 35, Supplement 1: European Aerosol Conference 2004, Budapest, Hungary, 6-10 September, 2004. Elsevier, S101−S102. (Journal of Aerosol Science).
3.1.
2004
Hõrrak, U.; Tammet, H.; Aalto, P.P.; Kulmala, M. (2004). Charge distribution on nanometer aerosol particles in the atmosphere during nucleation burst events. Abstracts of the European Aerosol Conference 2004, 35, Supplement 1: European Aerosol Conference 2004, Budapest, Hungary, 6-10 September, 2004. Elsevier, S299−S300. (Journal of Aerosol Science).
3.1.
2004
Komsaare, K.; Mirme, A.; Hõrrak, U. (2004). Small air ion and radon measurements at Tahkuse Observatory. Abstracts of the European Aerosol Conference 2004, 35, Supplement 1: European Aerosol Conference 2004, Budapest, Hungary, 6-10 September, 2004. Elsevier, S1009−S1010. (Journal of Aerosol Science).
3.1.
2004
Laaksonen, A.; Kulmala, M.; O Dowd, C.; Viisanen, Y.; Nilsson, D; Facchini, M.; Hoffmann, T.; Arnold, F.; Schell, B.; Junkermann, W.; Coe, H.; Worsnop, D.; Riekkola, M.; Hõrrak, U. (2004). Quantification of aerosol nucleation in the European boundary layer (QUEST): Results from an intensive field campaign in boreal forest. Abstracts of the European Aerosol Conference 2004, 35, Supplement 1: European Aerosol Conference 2004, Budapest, Hungary, 6-10 September, 2004. Elsevier, S1225−S1226. (Journal of Aerosol Science).
3.1.
2004
Sihto, S.; Korhonen, H.; Komppula, M.; Lehtinen, K.; Lihavainen, H.; Ruuskanen, T.; Hõrrak, U.; Kulmala, M. (2004). Lagrangian analysis of new particle formation events in Finnish Lapland. Abstracts of the European Aerosol Conference 2004, 35, Supplement 1: European Aerosol Conference 2004, Budapest, Hungary, 6-10 September, 2004. Elsevier, S957−S958. (Journal of Aerosol Science).
3.2.
2004
Hõrrak, U.; Tammet, H.; Aaalto, P.P.; Kulmala, M. (2004). Study of air ions and nanometer particles in the atmosphere during nucleation burst events. In: Markku Kulmala, Taina Ruuskanen (_EditorsAbbr). Proceedings of BACCI activities 2004, Book A (184−189).. Helsinki: Finnish association for aerosol research. (Report Series in Aerosol Science (Helsinki)).
3.2.
2004
Hõrrak, U.; Tammet, H.; Aalto, P.P.; Kulmala, M. (2004). On the charge distribution on nanometer aerosol particles in the atmosphere during nucleation burst events at boreal forest. In: Report Series in Aerosol Science (94−99).. Helsinki: Finnish association for aerosol research.
3.2.
2004
Lehtinen, K.; Dal Maso, M.; Laakso, L.; Riipinen, I.; Anttila, T.; Napari, I.; Korhonen, H.; Sihto, S.; Vana, M.; Hõrrak, U.; Kerminen, V.; Kulmala, M. (2004). Analyses on particle formation and growth rates during the QUEST campaign. In: Report Series in Aerosol Science (153−155).. Helsinki: Finnish association for aerosol research.
3.2.
2004
Ruuskanen, T.M.; Aalto, P.P.; Hõrrak, U.; Vana, M.; Mårtensson, M.; Yoon, Y.; Kaasik, M.; Keronen, P.; Nilsson, D; O Dowd, C.; Noppel, M.; Kulmala, M. (2004). Observations of particle formation events during LAPBIAT measurement campaign in Värriö field station. In: Kulmala, M.; Salonen, M.; Ruuskanen, T.M. (Ed.). Research unit on physics, chemistry and biology of atmospheric composition and climate change: II Progress Report and Proceedings of Seminar (266−269).. Helsinki: Finnish association for aerosol research. (Report Series in Aerosol Science; 68).
3.2.
2004
Sihto, S.; Korhonen, H.; Komppula, M.; Lehtinen, K.; Lihavainen, H.; Ruuskanen, T.; Hõrrak, U.; Kulmala, M. (2004). Modelling study of new particle formation events in Northern Finland: a Lagrangian trajectory analysis. In: Report Series in Aerosol Science (281−283).. Helsinki: Finnish association for aerosol research.
3.2.
2004
Laakso, L.; Anttila, T.; Lehtinen, K.; Hõrrak, U.; Paatero, J.; Kulmala, M. (2004). Kinetic nucleation and ions in boreal forest. In: Report Series in Aerosol Science (131−135).. Helsinki: Finnish association for aerosol research.
3.4.
2004
Hõrrak, U.; Tammet, H.; Aalto, P.P.; Kulmala, M. (2004). Charging state of nanometer aerosol particles in the atmosphere during nucleation burst events at boreal forest. In: Nucleation and Atmospheric Aerosols 2004: 16th Intenational Conference (307−310).. Kyoto: Kyoto University Press.
1.1.
2003
Horrak, U.; Salm, J.; Tammet, H. (2003). Diurnal variation in the concentration of air ions of different mobility classes in a rural area. Journal of Geophysical Research-Atmospheres, 108, AAC7-1−AAC7-11. DOI: 10.1029/2002JD003240.
3.1.
2003
Hõrrak, U.; Aalto, P.; Salm, J.; Kulmala, M. (2003). Characterization of air ions during nucleation events in boreal forest air. Abstracts of the European Aerosol Conference 2003, 34, Supplement 1: European Aerosol Conference 2003, 31 August – 5 September 2003, Madrid, Spain. Pergamon, S733−S734. (Journal of Aerosol Science).
3.1.
2003
Vana, M.; Kulmala, M.; Dal Maso, M.; Hõrrak, U. (2003). Some characteristics of the nucleation mode particles and intermediate air ions formation events in the atmospheric boundary layer. In: Journal of Aerosol Science (S735−S736).. Elsevier.
3.2.
2003
Hõrrak, U.; Aalto, P.; Salm, J.; Kulmala, M. (2003). Characterization of air ions during nucleation events in boreal forest air. In: Report Series in Aerosol Science (196−201).. Helsinki: Finnish association for aerosol research.
3.4.
2003
Hõrrak, U.; Salm, J.; Tammet, H. (2003). Diurnal variation in the concentration of air ions of different mobility classes. In: Chauzy, S.; Laroche, P. (_EditorsAbbr). ICAE 2003 Versailles. 12th International Conference On Atmospheric Electricity; Versailles, France; June 9-13 2003 (287−290).. Paris: Onera/ISP Press.
3.2.
2002
Iher, H.; Hõrrak, U.; Salm, J. (2002). Õhuseire Tahkusel. Roose, A. (_EditorsAbbr). Eesti Keskkonnaseire 2001 (26−27).. Tartu: Tartu Ülikooli Kirjastus.
3.2.
2002
Vana, M.; Kulmala, M.; DalMaso, M.; Hõrrak, U. (2002). On the formation and growth of nucleation mode particles and intermediate air ions in the atmospheric boundary layer. Report series in aerosol science (202−207).. Helsinki: Finnish association for aerosol research.
2.3.
2001
Hõrrak, U. (2001). Air Ion Mobility Spectrum at a Rural Area. (Doktoritöö, Tartu Ülikool, keskkonnafüüsika instituut). Tartu: Tartu University Press.
3.1.
2001
Hõrrak, U.; Salm, J.; Tammet, H. (2001). Diurnal variation of charged atmospheric aerosols in nucleation and Aitken mode ranges. Journal of Aerosol Science, 32, S169−S170.
3.1.
2001
Tamm, E.; Hõrrak, U.; Mirme, A.; Vana, M. (2001). On the charge distribution on atmospheric nanoparticles. In: Journal of Aerosol Science (S347−S348).. Elsevier.
1.1.
2000
Horrak, U.; Salm, J.; Tammet, H. (2000). Statistical characterization of air ion mobility spectra at Tahkuse Observatory: Classification of air ions. Journal of Geophysical Research-Atmospheres, 105, 9291−9302.
3.1.
2000
Noppel, M.; Hõrrak, U. (2000). Simulation of the mobility spectrum of charged particles during bursts in atmospheric air. 31. Elsevier, S700−S701.
3.1.
2000
Vana, M.; Hõrrak, U.; Tamm, E. (2000). Comparative study of the ultrafine aerosol particle and intermediate air ion concentration bursts in the atmosphere. In: Journal of Aerosol Science (S176−S177).. Elsevier.
3.4.
1999
Hõrrak, U.; Salm, J.; Tammet, H. (1999). Classification of natural air ions near the ground. 11th International Conference on Atmospheric Electricity: June 7-11,1999, Guntersville, Alabama, USA. _EditorsAbbr H.J. Christian. Marshall Space Flight Center (MSFC), Alabama: National Aeronautics and Space Administration (NASA), 618−621.
1.1.
1998
Horrak, U.; Mirme, A.; Salm, J.; Tamm, E.; Tammet, H. (1998). Air ion measurements as a source of information about atmospheric aerosols. Atmospheric Research, 46, 233−242.
1.1.
1998
Horrak, U.; Salm, J.; Tammet, H. (1998). Bursts of intermediate ions in atmospheric air. Journal of Geophysical Research-Atmospheres, 103, 13909−13915.
3.1.
1998
Hõrrak, U.; Mirme, A.; Salm, J.; Tamm, E.; Tammet, H. (1998). Study of covariations of aerosol and air ion mobility spectra at Tahkuse, Estonia. In: Journal of Aerosol Science (S849−S850).. Elsevier.
3.2.
1998
Hõrrak, U.; Iher, H.; Salm, J. (1998). Keskkonnaseire Tahkusel. Environmental Monitoring at Tahkuse. Eesti keskkonnaseire (30−33).. Tartu: Keskkonnaministeeriumi Info- ja Tehnokeskus. (Keskkonnaministeeriumi Info- ja Tehnokeskus).
3.1.
1996
Hõrrak, U.; Salm, J.; Tamm, E.; Tammet, H. (1996). Derivation of the size spectrum of aerosol particles from a mobility spectrum. In: Kulmala, M.; Wagner, P.E. (_EditorsAbbr). Nucleation and atmospheric aerosols (562−565).. Oxford, Tarrytown: Pergamon-Elsevier Science Ltd.
1.1.
1994
Horrak, U.; Iher, H.; Luts, A.; Salm, J.; Tammet, H. (1994). Mobility spectrum of air ions at tahkuse-observatory. Journal of Geophysical Research-Atmospheres, 99, 10697−10700.
15.05.2020

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ProgrammLiikNumberNimiProjekti algusProjekti lõppVastutav täitjaAsutusFinantseerijapoolne rahastamine
MUULLOFY15040Aeroioonide ja nanoosakeste spektromeetrite NAIS ja aerosooliosakeste spektromeetrite EAS kalibreerimine TÜ Füüsika Instituudis olemasolevate seadmetega16.02.201531.12.2015Urmas HõrrakTartu Ülikool; Tartu Ülikool, Loodus- ja tehnoloogiateaduskond, Tartu Ülikooli Füüsika Instituut3 333,33 EUR
2.1.1.LLTFY19516 Aeroioonide ja nanoosakeste spektromeetrite NAIS ja aerosooliosakeste spektromeetrite EAS kalibreerimine02.09.201931.12.2019Urmas HõrrakTartu Ülikool, Loodus- ja täppisteaduste valdkond, füüsika instituut3 333,33 EUR
2.1.1.LLTFY18099Aeroioonide ja nanoosakeste spektromeetrite „NAIS“ ja aerosooliosakeste spektromeetrite „EAS“ kalibreerimine01.01.201831.12.2018Urmas HõrrakTartu Ülikool, Loodus- ja täppisteaduste valdkond, füüsika instituut3 333,33 EUR
MUULLTFY16308Aeroioonide ja nanoosakeste spektromeetrite „NAIS“ ja aerosooliosakeste spektromeetrite „EAS“ kalibreerimine01.07.201630.06.2017Urmas HõrrakTartu Ülikool, Loodus- ja täppisteaduste valdkond, füüsika instituut3 333,33 EUR
ETFETF8342Atmosfääri ioon-aerosoolprotsesside analüüs vaatlusandmetele ja füüsikalis-keemilisele teooriale tuginevate mudelite abil 01.01.201031.12.2013Urmas HõrrakTartu Ülikool, Loodus- ja tehnoloogiateaduskond, Tartu Ülikooli Füüsika Instituut47 856,26 EUR
MOBTTMOBTT42Atmosfääri keemiline koostis ja koostoimed: gaasidest osakeste tekke ja kliima muutuseni01.09.201731.08.2022Heikki JunninenTartu Ülikool, Loodus- ja täppisteaduste valdkond, füüsika instituut749 930,10 EUR
ETFETF5387Atmosfääriaerosooli mõõtmespektri struktuuri seosed atmosfääri elektriliste ja optiliste parameetritega ning õhumassi päritoluga01.01.200331.12.2006Eduard TammTartu Ülikool, Füüsika-keemiateaduskond75 588,97 EUR
SFSF0182133s02Atmosfääriprotsesside dünaamiline ja statistiline modelleerimine01.01.200231.12.2006Rein RõõmTartu Ülikool, Füüsika-keemiateaduskond681 106,43 EUR
MUUSLOOM12022T (3.2.0802.11-0043)Eesti Keskkonnaobservatooriumi biosfääri ja atmosfääri alane teadus- ja arendustegevus (BioAtmos)01.10.201131.12.2014Kaido SoosaarTartu Ülikool757 600,23 EUR
MUUFP7: ESTSPACE (204727)Eesti kosmoseuuringute ja-tehnoloogia võimekuse avamine partnerluse kaudu tipptasemel Euroopa teadusasutustega01.01.200831.12.2011Anu NoormaTartu Observatoorium1 100 239,03 EUR
MUUMFKKF07001REuroopa Liidu 6. raamprogrammi projekt “European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI)"01.01.200731.12.2010Urmas HõrrakTartu Ülikool, Füüsika-keemiateaduskond, Keemilise füüsika instituut59 998,91 EUR
ETFETF6223Ionisatsiooni ja saastegaaside osa klastrite ja nanomeeterosakeste tekkimisel ning evolutsioonis atmosfääriõhus01.01.200531.12.2008Urmas HõrrakTartu Ülikool, Füüsika-keemiateaduskond; Tartu Ülikool, Loodus- ja tehnoloogiateaduskond76 318,01 EUR
PRGPRG714Kuidas molekulaarsed protsessid muudavad puhtas ja saastunud atmosfääris tekkinud õhuioonid klimaatiliselt olulisteks aerosooliosakesteks.01.01.202031.12.2024Heikki JunninenTartu Ülikool, Loodus- ja täppisteaduste valdkond, füüsika instituut514 250,00 EUR
ETFETF8806Metalliaurude ioon-indutseeritud nukleatsioon01.01.201131.12.2014Madis NoppelTartu Ülikool, Loodus- ja tehnoloogiateaduskond, Tartu Ülikooli Füüsika Instituut47 040,00 EUR
SFSF0180043s08Nanomeeterosakeste tekkimine ja aerosooliosakeste mõõtmespektri kujunemine nõrgalt ioniseeritud atmosfääri keskkonnas01.01.200831.12.2013Urmas HõrrakTartu Ülikool, Loodus- ja tehnoloogiateaduskond, Tartu Ülikooli Füüsika Instituut579 545,81 EUR
IUTIUT20-11Nanoosakesed õhus ja nende osa meteoroloogilistes protsessides01.01.201431.12.2019Urmas HõrrakTartu Ülikool, Loodus- ja täppisteaduste valdkond, füüsika instituut1 013 400,00 EUR
MUUMLOFY12171Tahkuse õhuseirejaama aparatuurikompleksi täiendamine uute kaasaegsete saastegaaside analüsaatoritega01.06.201231.03.2016Urmas HõrrakTartu Ülikool, Loodus- ja tehnoloogiateaduskond, Tartu Ülikooli Füüsika Instituut; Tartu Ülikool, Loodus- ja täppisteaduste valdkond, füüsika instituut151 211,54 EUR
APSF0180043s08APVäikesemahulise teaduse infrastruktuuri kaasajastamine teadusteema SF0180043s08 raames01.01.201031.12.2011Urmas HõrrakTartu Ülikool, Loodus- ja tehnoloogiateaduskond, Tartu Ülikooli Füüsika Instituut51 462,94 EUR
APSF0180043s08AP11Väikesemahulise teaduse infrastruktuuri kaasajastamine teadusteema SF0180043s08 raames01.01.201131.12.2012Urmas HõrrakTartu Ülikool, Loodus- ja tehnoloogiateaduskond, Tartu Ülikooli Füüsika Instituut53 410,07 EUR
MUULLTFY16210Välisõhu kvaliteedi kompleksuuringud Tahkusel 201611.05.201601.02.2017Urmas HõrrakTartu Ülikool, Loodus- ja täppisteaduste valdkond, füüsika instituut6 923,40 EUR
1.1.3.2.1.LLTFY17122Välisõhu kvaliteedi kompleksuuringud Tahkusel 201717.03.201701.02.2018Urmas HõrrakTartu Ülikool, Loodus- ja täppisteaduste valdkond, füüsika instituut6 923,40 EUR
1.1.3.2.1.LLTFY18213Välisõhu kvaliteedi kompleksuuringud Tahkusel 201820.03.201801.02.2019Urmas HõrrakTartu Ülikool, Loodus- ja täppisteaduste valdkond, füüsika instituut7 475,60 EUR
1.1.3.2.1.LLTFY19331 Välisõhu kvaliteedi kompleksuuringud Tahkusel 201909.05.201901.02.2020Urmas HõrrakTartu Ülikool, Loodus- ja täppisteaduste valdkond, füüsika instituut10 000,00 EUR
1.1.3.2.1.LLTFY20248Välisõhu kvaliteedi kompleksuuringud Tahkusel 202004.05.202001.02.2021Urmas HõrrakTartu Ülikool, Loodus- ja täppisteaduste valdkond, füüsika instituut10 000,00 EUR
MUULLOFY08038/6Õhu kvaliteedi kompleksuuringud Tahkuse seirejaamas 2014.aastal25.04.201401.02.2015Eduard TammTartu Ülikool; Tartu Ülikool, Loodus- ja tehnoloogiateaduskond, Tartu Ülikooli Füüsika Instituut2 083,33 EUR