Aerosol number size distribution in the boreal environment : spatio-temporal variation
Atmospheric aerosols have an impact on the global radiation budget, and thus on climate, they reduce the air quality and visibility, and have multiple harmful health effects. The climatic significance of aerosols result from their ability to scatter and absorb solar radiation, and, if being large en...
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ftunivhelsihelda:oai:helda.helsinki.fi:10138/169206 2023-08-20T04:07:48+02:00 Aerosol number size distribution in the boreal environment : spatio-temporal variation Ilmakehän pienhiukkasten kokojakauman alueellinen ja ajallinen vaihtelu havumetsäympäristössä Väänänen, Riikka Wehner, Birgit 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 Petäjä, Tuukka Kulmala, Markku Krejci, Radovan Manninen, Hanna E. 2016-11-21T06:19:19Z application/pdf http://hdl.handle.net/10138/169206 eng eng Helsingin yliopisto Helsingfors universitet University of Helsinki URN:ISBN:978-952-7091-67-8 Helsinki: Finnish Association for Aerosol Research, 2016, Report series of aerosol science http://hdl.handle.net/10138/169206 URN:ISBN:978-952-7091-68-5 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 2016 ftunivhelsihelda 2023-07-28T06:29:21Z Atmospheric aerosols have an impact on the global radiation budget, and thus on climate, they reduce the air quality and visibility, and have multiple harmful health effects. The climatic significance of aerosols result from their ability to scatter and absorb solar radiation, and, if being large enough, mediate the cloud albedo and lifetime by acting as cloud condensation nuclei (CCN). The climatic effect, however, has a notable uncertainty. Particles can be either directly emitted to atmosphere or they can form there from precursor vapors. The latter is called new particle formation (NPF). Globally, NPF has been estimated to be responsible for even half of CCN sized tropospheric particles. The understanding of the NPF mechanisms and the spatial and temporal variation of NPF in many scales is necessary to correctly represent aerosols in climate models. In this work, we quantified the importance of biogenic organic vapours and anthropogenic sulfuric emissions in the NPF in northern boreal environment. Aerosol number size distribution data from three measurement sites were used to calculate the average continuous increase in aerosol particle diameter and number concentration when air masses travelled over land. A 14-year-long time series of aerosol and gas measurements were used to determine the effect of reduced Kola Peninsula SO2 emissions on aerosol population at Eastern Finnish Lapland. Secondly, this thesis describes in-situ aerosol measurements conducted with a light aircraft within the lowest 4 km of the troposphere. The data were used to determine the vertical and horizontal extent and variability of the NPF events in the surroundings of the Hyytiälä SMEAR II station. The airborne and ground level measurements were compared to find out the representativeness of the on ground measurements in the lowest parts of the atmosphere, in the planetary boundary layer. The results showed that the Aitken mode particles grew, on average, at the apparent rate of around 1 nm h−1 when they travelled over the northern ... Doctoral or Postdoctoral Thesis kola peninsula Lapland Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto Aitken ENVELOPE(-44.516,-44.516,-60.733,-60.733) Kola Peninsula |
institution |
Open Polar |
collection |
Helsingfors Universitet: HELDA – Helsingin yliopiston digitaalinen arkisto |
op_collection_id |
ftunivhelsihelda |
language |
English |
topic |
fysiikka |
spellingShingle |
fysiikka Väänänen, Riikka Aerosol number size distribution in the boreal environment : spatio-temporal variation |
topic_facet |
fysiikka |
description |
Atmospheric aerosols have an impact on the global radiation budget, and thus on climate, they reduce the air quality and visibility, and have multiple harmful health effects. The climatic significance of aerosols result from their ability to scatter and absorb solar radiation, and, if being large enough, mediate the cloud albedo and lifetime by acting as cloud condensation nuclei (CCN). The climatic effect, however, has a notable uncertainty. Particles can be either directly emitted to atmosphere or they can form there from precursor vapors. The latter is called new particle formation (NPF). Globally, NPF has been estimated to be responsible for even half of CCN sized tropospheric particles. The understanding of the NPF mechanisms and the spatial and temporal variation of NPF in many scales is necessary to correctly represent aerosols in climate models. In this work, we quantified the importance of biogenic organic vapours and anthropogenic sulfuric emissions in the NPF in northern boreal environment. Aerosol number size distribution data from three measurement sites were used to calculate the average continuous increase in aerosol particle diameter and number concentration when air masses travelled over land. A 14-year-long time series of aerosol and gas measurements were used to determine the effect of reduced Kola Peninsula SO2 emissions on aerosol population at Eastern Finnish Lapland. Secondly, this thesis describes in-situ aerosol measurements conducted with a light aircraft within the lowest 4 km of the troposphere. The data were used to determine the vertical and horizontal extent and variability of the NPF events in the surroundings of the Hyytiälä SMEAR II station. The airborne and ground level measurements were compared to find out the representativeness of the on ground measurements in the lowest parts of the atmosphere, in the planetary boundary layer. The results showed that the Aitken mode particles grew, on average, at the apparent rate of around 1 nm h−1 when they travelled over the northern ... |
author2 |
Wehner, Birgit 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 Petäjä, Tuukka Kulmala, Markku Krejci, Radovan Manninen, Hanna E. |
format |
Doctoral or Postdoctoral Thesis |
author |
Väänänen, Riikka |
author_facet |
Väänänen, Riikka |
author_sort |
Väänänen, Riikka |
title |
Aerosol number size distribution in the boreal environment : spatio-temporal variation |
title_short |
Aerosol number size distribution in the boreal environment : spatio-temporal variation |
title_full |
Aerosol number size distribution in the boreal environment : spatio-temporal variation |
title_fullStr |
Aerosol number size distribution in the boreal environment : spatio-temporal variation |
title_full_unstemmed |
Aerosol number size distribution in the boreal environment : spatio-temporal variation |
title_sort |
aerosol number size distribution in the boreal environment : spatio-temporal variation |
publisher |
Helsingin yliopisto |
publishDate |
2016 |
url |
http://hdl.handle.net/10138/169206 |
long_lat |
ENVELOPE(-44.516,-44.516,-60.733,-60.733) |
geographic |
Aitken Kola Peninsula |
geographic_facet |
Aitken Kola Peninsula |
genre |
kola peninsula Lapland |
genre_facet |
kola peninsula Lapland |
op_relation |
URN:ISBN:978-952-7091-67-8 Helsinki: Finnish Association for Aerosol Research, 2016, Report series of aerosol science http://hdl.handle.net/10138/169206 URN:ISBN:978-952-7091-68-5 |
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. |
_version_ |
1774719686144950272 |