Experimental studies on new particle formation and ions
Atmospheric aerosol particles have significant climatic effects. Secondary new particle formation is a globally important source of these particles. Currently, the mechanisms of particle formation and the vapours participating in this process are, however, not truly understood. The recently develope...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/23215 2023-08-20T04:00:43+02:00 Experimental studies on new particle formation and ions Asmi, Eija Keskinen, Jorma University of Helsinki, Faculty of Science, Department of Physics, Division of Atmospheric Sciences Finnish Meteorological Institute Helsingin yliopisto, matemaattis-luonnontieteellinen tiedekunta, fysiikan laitos Helsingfors universitet, matematisk-naturvetenskapliga fakulteten, institutionen för fysik Kulmala, Markku 2010-11-25T14:10:15Z application/pdf http://hdl.handle.net/10138/23215 eng eng Helsingin yliopisto Helsingfors universitet University of Helsinki URN:ISBN:978-952-5822-17-5 Report series in aerosol science. 0784-3496 http://hdl.handle.net/10138/23215 URN:ISBN:978-952-5822-18-2 Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. fysiikka Text Doctoral dissertation (article-based) Artikkeliväitöskirja Artikelavhandling doctoralThesis 2010 ftunivhelsihelda 2023-07-28T06:34:52Z Atmospheric aerosol particles have significant climatic effects. Secondary new particle formation is a globally important source of these particles. Currently, the mechanisms of particle formation and the vapours participating in this process are, however, not truly understood. The recently developed Neutral cluster and Air Ion Spectrometer (NAIS) was widely used in field studies of atmospheric particle formation. The NAIS was calibrated and found to be in adequate agreement with the reference instruments. It was concluded that NAIS can be reliably used to measure ions and particles near the sizes where the atmospheric particle formation begins. The main focus of this thesis was to study new particle formation and participation of ions in this process. To attain this objective, particle and ion formation and growth rates were studied in various environments - at several field sites in Europe, in previously rarely studied sites in Antarctica and Siberia and also in an indoor environment. New particle formation was observed at all sites were studied and the observations were used as indicatives of the particle formation mechanisms. Particle size-dependent growth rates and nucleation mode hygroscopic growth factors were examined to obtain information on the particle growth. It was found that the atmospheric ions participate in the initial steps of new particle formation, although their contribution was minor in the boundary layer. The highest atmospheric particle formation rates were observed at the most polluted sites where the role of ions was the least pronounced. Furthermore, the increase of particle growth rate with size suggested that enhancement of the growth by ions was negligible. Participation of organic vapours in the particle growth was supported by laboratory and field observations. It was addressed that secondary new particle formation can also be a significant source of indoor air particles. These results, extending over a wide variety of environments, give support to previous observations and ... Doctoral or Postdoctoral Thesis Antarc* Antarctica Siberia Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
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Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
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fysiikka Asmi, Eija Experimental studies on new particle formation and ions |
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fysiikka |
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Atmospheric aerosol particles have significant climatic effects. Secondary new particle formation is a globally important source of these particles. Currently, the mechanisms of particle formation and the vapours participating in this process are, however, not truly understood. The recently developed Neutral cluster and Air Ion Spectrometer (NAIS) was widely used in field studies of atmospheric particle formation. The NAIS was calibrated and found to be in adequate agreement with the reference instruments. It was concluded that NAIS can be reliably used to measure ions and particles near the sizes where the atmospheric particle formation begins. The main focus of this thesis was to study new particle formation and participation of ions in this process. To attain this objective, particle and ion formation and growth rates were studied in various environments - at several field sites in Europe, in previously rarely studied sites in Antarctica and Siberia and also in an indoor environment. New particle formation was observed at all sites were studied and the observations were used as indicatives of the particle formation mechanisms. Particle size-dependent growth rates and nucleation mode hygroscopic growth factors were examined to obtain information on the particle growth. It was found that the atmospheric ions participate in the initial steps of new particle formation, although their contribution was minor in the boundary layer. The highest atmospheric particle formation rates were observed at the most polluted sites where the role of ions was the least pronounced. Furthermore, the increase of particle growth rate with size suggested that enhancement of the growth by ions was negligible. Participation of organic vapours in the particle growth was supported by laboratory and field observations. It was addressed that secondary new particle formation can also be a significant source of indoor air particles. These results, extending over a wide variety of environments, give support to previous observations and ... |
author2 |
Keskinen, Jorma University of Helsinki, Faculty of Science, Department of Physics, Division of Atmospheric Sciences Finnish Meteorological Institute Helsingin yliopisto, matemaattis-luonnontieteellinen tiedekunta, fysiikan laitos Helsingfors universitet, matematisk-naturvetenskapliga fakulteten, institutionen för fysik Kulmala, Markku |
format |
Doctoral or Postdoctoral Thesis |
author |
Asmi, Eija |
author_facet |
Asmi, Eija |
author_sort |
Asmi, Eija |
title |
Experimental studies on new particle formation and ions |
title_short |
Experimental studies on new particle formation and ions |
title_full |
Experimental studies on new particle formation and ions |
title_fullStr |
Experimental studies on new particle formation and ions |
title_full_unstemmed |
Experimental studies on new particle formation and ions |
title_sort |
experimental studies on new particle formation and ions |
publisher |
Helsingin yliopisto |
publishDate |
2010 |
url |
http://hdl.handle.net/10138/23215 |
genre |
Antarc* Antarctica Siberia |
genre_facet |
Antarc* Antarctica Siberia |
op_relation |
URN:ISBN:978-952-5822-17-5 Report series in aerosol science. 0784-3496 http://hdl.handle.net/10138/23215 URN:ISBN:978-952-5822-18-2 |
op_rights |
Julkaisu on tekijänoikeussäännösten alainen. Teosta voi lukea ja tulostaa henkilökohtaista käyttöä varten. Käyttö kaupallisiin tarkoituksiin on kielletty. This publication is copyrighted. You may download, display and print it for Your own personal use. Commercial use is prohibited. Publikationen är skyddad av upphovsrätten. Den får läsas och skrivas ut för personligt bruk. Användning i kommersiellt syfte är förbjuden. |
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1774719952778952704 |