Measurements of optical properties of atmospheric aerosols in Northern Finland
International audience Three years of continuous measurements of aerosol optical properties and simultaneous aerosol number size distribution measurements at Pallas GAW station, a remote subarctic site in the northern border of the boreal forest zone, have been analysed. The scattering coefficient a...
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ftinsu:oai:HAL:hal-00301933v1 2023-11-12T04:20:27+01:00 Measurements of optical properties of atmospheric aerosols in Northern Finland Aaltonen, V. Lihavainen, H. Kerminen, V.-M. Komppula, M. Hatakka, J. Eneroth, K. Kulmala, M. Viisanen, Y. Finnish Meteorological Institute (FMI) Department of Applied Environmental Science Stockholm (ITM) Stockholm University Department of Physical Sciences Helsinki Helsingin yliopisto = Helsingfors universitet = University of Helsinki 2005-11-15 https://hal.science/hal-00301933 https://hal.science/hal-00301933/document https://hal.science/hal-00301933/file/acpd-5-11703-2005.pdf en eng HAL CCSD European Geosciences Union hal-00301933 https://hal.science/hal-00301933 https://hal.science/hal-00301933/document https://hal.science/hal-00301933/file/acpd-5-11703-2005.pdf info:eu-repo/semantics/OpenAccess ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.science/hal-00301933 Atmospheric Chemistry and Physics Discussions, 2005, 5 (6), pp.11703-11728 [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/article Journal articles 2005 ftinsu 2023-11-01T17:26:04Z International audience Three years of continuous measurements of aerosol optical properties and simultaneous aerosol number size distribution measurements at Pallas GAW station, a remote subarctic site in the northern border of the boreal forest zone, have been analysed. The scattering coefficient at 550 nm varied from 0.2 to 94.4 Mm ?1 with an average of 7.1±8.6 Mm ?1 . Both the scattering and backscattering coefficients had a clear seasonal cycle with an autumn minimum and a 4?5 times higher summer maximum. The scattering was dominated by submicron aerosols and especially so during late summer and autumn. The Ångström exponent had a clear seasonal pattern with maximum values in late summer and minimum values during wintertime. The highest hemispheric backscattering fraction values were observed in autumn, indicating clean air with few scattering particles and a particle size distribution strongly dominated by ultrafine particles. To analyse the influence of air mass origin on the aerosol optical properties a trajectory climatology was applied to the Pallas aerosol data. The most polluted trajectory patterns represented air masses from the Kola Peninsula, Scandinavia and Russia as well as long-range transport from Britain and Eastern Europe. These air masses had the largest average scattering and backscattering coefficients for all seasons. Higher than average values of the Ångström exponent were also observed in connection with transport from these areas. Article in Journal/Newspaper kola peninsula Northern Finland Subarctic Institut national des sciences de l'Univers: HAL-INSU Kola Peninsula |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Aaltonen, V. Lihavainen, H. Kerminen, V.-M. Komppula, M. Hatakka, J. Eneroth, K. Kulmala, M. Viisanen, Y. Measurements of optical properties of atmospheric aerosols in Northern Finland |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
International audience Three years of continuous measurements of aerosol optical properties and simultaneous aerosol number size distribution measurements at Pallas GAW station, a remote subarctic site in the northern border of the boreal forest zone, have been analysed. The scattering coefficient at 550 nm varied from 0.2 to 94.4 Mm ?1 with an average of 7.1±8.6 Mm ?1 . Both the scattering and backscattering coefficients had a clear seasonal cycle with an autumn minimum and a 4?5 times higher summer maximum. The scattering was dominated by submicron aerosols and especially so during late summer and autumn. The Ångström exponent had a clear seasonal pattern with maximum values in late summer and minimum values during wintertime. The highest hemispheric backscattering fraction values were observed in autumn, indicating clean air with few scattering particles and a particle size distribution strongly dominated by ultrafine particles. To analyse the influence of air mass origin on the aerosol optical properties a trajectory climatology was applied to the Pallas aerosol data. The most polluted trajectory patterns represented air masses from the Kola Peninsula, Scandinavia and Russia as well as long-range transport from Britain and Eastern Europe. These air masses had the largest average scattering and backscattering coefficients for all seasons. Higher than average values of the Ångström exponent were also observed in connection with transport from these areas. |
author2 |
Finnish Meteorological Institute (FMI) Department of Applied Environmental Science Stockholm (ITM) Stockholm University Department of Physical Sciences Helsinki Helsingin yliopisto = Helsingfors universitet = University of Helsinki |
format |
Article in Journal/Newspaper |
author |
Aaltonen, V. Lihavainen, H. Kerminen, V.-M. Komppula, M. Hatakka, J. Eneroth, K. Kulmala, M. Viisanen, Y. |
author_facet |
Aaltonen, V. Lihavainen, H. Kerminen, V.-M. Komppula, M. Hatakka, J. Eneroth, K. Kulmala, M. Viisanen, Y. |
author_sort |
Aaltonen, V. |
title |
Measurements of optical properties of atmospheric aerosols in Northern Finland |
title_short |
Measurements of optical properties of atmospheric aerosols in Northern Finland |
title_full |
Measurements of optical properties of atmospheric aerosols in Northern Finland |
title_fullStr |
Measurements of optical properties of atmospheric aerosols in Northern Finland |
title_full_unstemmed |
Measurements of optical properties of atmospheric aerosols in Northern Finland |
title_sort |
measurements of optical properties of atmospheric aerosols in northern finland |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.science/hal-00301933 https://hal.science/hal-00301933/document https://hal.science/hal-00301933/file/acpd-5-11703-2005.pdf |
geographic |
Kola Peninsula |
geographic_facet |
Kola Peninsula |
genre |
kola peninsula Northern Finland Subarctic |
genre_facet |
kola peninsula Northern Finland Subarctic |
op_source |
ISSN: 1680-7367 EISSN: 1680-7375 Atmospheric Chemistry and Physics Discussions https://hal.science/hal-00301933 Atmospheric Chemistry and Physics Discussions, 2005, 5 (6), pp.11703-11728 |
op_relation |
hal-00301933 https://hal.science/hal-00301933 https://hal.science/hal-00301933/document https://hal.science/hal-00301933/file/acpd-5-11703-2005.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1782336395948326912 |