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| Titel |
Measurements of optical properties of atmospheric aerosols in Northern Finland |
| VerfasserIn |
V. Aaltonen, H. Lihavainen, V.-M. Kerminen, M. Komppula, J. Hatakka, K. Eneroth, M. Kulmala  , Y. Viisanen |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 6, no. 5 ; Nr. 6, no. 5 (2006-04-11), S.1155-1164 |
| Datensatznummer |
250003720
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| Publikation (Nr.) |
 copernicus.org/acp-6-1155-2006.pdf |
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| Zusammenfassung |
| 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. 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. |
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