Natural and Anthropogenic Influences on Atmospheric Aerosol Variability
Aerosol particles are everywhere in the atmosphere. They are a key factor in many important processes in the atmosphere, including cloud formation, scattering of incoming solar radiation and air chemistry. The aerosol particles have relatively short lifetimes in lower atmosphere, typically from days...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/37607 2023-08-20T04:01:43+02:00 Natural and Anthropogenic Influences on Atmospheric Aerosol Variability Ilmakehän aerosolihiukkasten vaihtelun luonnolliset ja ihmisperäiset syyt Asmi, Ari Maßling, Andreas University of Helsinki, Faculty of Science, Department of Physics, Division of Atmospheric Sciences Helsingin yliopisto, matemaattis-luonnontieteellinen tiedekunta, fysiikan laitos Helsingfors universitet, matematisk-naturvetenskapliga fakulteten, institutionen för fysik Kulmala, Markku Kerminen, Veli-Matti 2012-11-22T08:38:40Z application/pdf http://hdl.handle.net/10138/37607 eng eng Helsingin yliopisto Helsingfors universitet University of Helsinki URN:ISBN:978-952-5822-70-0 Helsinki: Aerosolitutkimusseura r.y., 2012, Report Series in Aerosol Science. 0784-3496 http://hdl.handle.net/10138/37607 URN:ISBN:978-952-5822-71-7 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 2012 ftunivhelsihelda 2023-07-28T06:25:03Z Aerosol particles are everywhere in the atmosphere. They are a key factor in many important processes in the atmosphere, including cloud formation, scattering of incoming solar radiation and air chemistry. The aerosol particles have relatively short lifetimes in lower atmosphere, typically from days to weeks, and thus they have a high spatial and temporal variability. This thesis concentrates on the extent and reasons of sub-micron aerosol particle variability in the lower atmosphere, using both global atmospheric models and analysis of observational data. Aerosol number size distributions in the lower atmosphere are affected strongly by the new particle formation. Perhaps more importantly, a strong influence new particle formation is also evident in the cloud condensation nuclei (CCN) concentrations, suggesting a major role of the sulphuric acid driven new particle formation in the climate system. In this thesis, the sub-micron aerosol number size distributions in the European regional background air were characterized for the first time from consistent, homogenized and comparable datasets. Some recent studies have suggested that differences in aerosol emissions between weekdays could also affect the weather via aerosol-cloud interactions. In this thesis, the weekday-to-weekday variation of CCN sized aerosol number concentrations in Europe were found to be much smaller than expected from earlier studies, based on particle mass measurements. This result suggests that a lack of week-day variability in meteorology is not necessarily a sign of weak aerosol-cloud interactions. An analysis of statistically significant trends in past decades of measured aerosol number concentrations from Europe, North America, Pacific islands and Antarctica generally show decreases in concentrations. The analysis of these changes show that a potential explanation for the decreasing trends is the general reduction of anthropogenic emissions, especially SO2, although a combination of several drivers for these changes in the number ... Doctoral or Postdoctoral Thesis Antarc* Antarctica Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto Pacific |
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Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
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English |
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fysiikka Asmi, Ari Natural and Anthropogenic Influences on Atmospheric Aerosol Variability |
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fysiikka |
description |
Aerosol particles are everywhere in the atmosphere. They are a key factor in many important processes in the atmosphere, including cloud formation, scattering of incoming solar radiation and air chemistry. The aerosol particles have relatively short lifetimes in lower atmosphere, typically from days to weeks, and thus they have a high spatial and temporal variability. This thesis concentrates on the extent and reasons of sub-micron aerosol particle variability in the lower atmosphere, using both global atmospheric models and analysis of observational data. Aerosol number size distributions in the lower atmosphere are affected strongly by the new particle formation. Perhaps more importantly, a strong influence new particle formation is also evident in the cloud condensation nuclei (CCN) concentrations, suggesting a major role of the sulphuric acid driven new particle formation in the climate system. In this thesis, the sub-micron aerosol number size distributions in the European regional background air were characterized for the first time from consistent, homogenized and comparable datasets. Some recent studies have suggested that differences in aerosol emissions between weekdays could also affect the weather via aerosol-cloud interactions. In this thesis, the weekday-to-weekday variation of CCN sized aerosol number concentrations in Europe were found to be much smaller than expected from earlier studies, based on particle mass measurements. This result suggests that a lack of week-day variability in meteorology is not necessarily a sign of weak aerosol-cloud interactions. An analysis of statistically significant trends in past decades of measured aerosol number concentrations from Europe, North America, Pacific islands and Antarctica generally show decreases in concentrations. The analysis of these changes show that a potential explanation for the decreasing trends is the general reduction of anthropogenic emissions, especially SO2, although a combination of several drivers for these changes in the number ... |
author2 |
Maßling, Andreas University of Helsinki, Faculty of Science, Department of Physics, Division of Atmospheric Sciences Helsingin yliopisto, matemaattis-luonnontieteellinen tiedekunta, fysiikan laitos Helsingfors universitet, matematisk-naturvetenskapliga fakulteten, institutionen för fysik Kulmala, Markku Kerminen, Veli-Matti |
format |
Doctoral or Postdoctoral Thesis |
author |
Asmi, Ari |
author_facet |
Asmi, Ari |
author_sort |
Asmi, Ari |
title |
Natural and Anthropogenic Influences on Atmospheric Aerosol Variability |
title_short |
Natural and Anthropogenic Influences on Atmospheric Aerosol Variability |
title_full |
Natural and Anthropogenic Influences on Atmospheric Aerosol Variability |
title_fullStr |
Natural and Anthropogenic Influences on Atmospheric Aerosol Variability |
title_full_unstemmed |
Natural and Anthropogenic Influences on Atmospheric Aerosol Variability |
title_sort |
natural and anthropogenic influences on atmospheric aerosol variability |
publisher |
Helsingin yliopisto |
publishDate |
2012 |
url |
http://hdl.handle.net/10138/37607 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
URN:ISBN:978-952-5822-70-0 Helsinki: Aerosolitutkimusseura r.y., 2012, Report Series in Aerosol Science. 0784-3496 http://hdl.handle.net/10138/37607 URN:ISBN:978-952-5822-71-7 |
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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