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| Titel |
Cluster analysis of the impact of air back-trajectories on aerosol optical properties at Hornsund, Spitsbergen |
| VerfasserIn |
A. Rozwadowska, T. Zielinski, T. Petelski, P. Sobolewski |
| 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 ; 10, no. 3 ; Nr. 10, no. 3 (2010-02-01), S.877-893 |
| Datensatznummer |
250008018
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| Publikation (Nr.) |
 copernicus.org/acp-10-877-2010.pdf |
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| Zusammenfassung |
| In this paper, spectra of aerosol optical thickness from the AERONET
(AErosol RObotic NETwork) station at Hornsund in the southern part
of Spitsbergen were employed to study the impact of air mass history
on aerosol optical thickness for wavelength λ=500 nm –
AOT(500) – and the Ångström exponent. Backward trajectories
computed, using the NOAA HYSPLIT model, were used to trace air
history. It was found that in spring, the changes in AOT values over
the Hornsund station were strongly influenced by air mass
trajectories 8 days or longer in duration, arriving both in the free
troposphere and at an altitude of 1 km above sea level.
Nevertheless, free tropospheric advection was dominant. AOT
variability in summer was best explained by the local direction and
speed of advection (1-day trajectories) and was dominated by the
effectiveness of cleansing processes. During the ASTAR 2007
campaign, the aerosols near Hornsund displayed low AOT values
ranging from 0.06 to 0.09, which is lower than the mean AOT(500) for
spring seasons from 2005 to 2007 (0.110±0.007; mean ±
standard deviation of mean). 9 April 2007 with AOT(500)=0.147 was
exceptional. The back-trajectories belonged to clusters with low and
average cluster mean AOT. Apart from the maximum AOT of
9 April 2007, the observed AOT values were close to or lower than
the means for the clusters to which they belonged. |
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