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| Titel |
Aerosol decadal trends – Part 2: In-situ aerosol particle number concentrations at GAW and ACTRIS stations |
| VerfasserIn |
A. Asmi, M. Collaud Coen, J. A. Ogren, E. Andrews, P. Sheridan, A. Jefferson, E. Weingärtner, U. Baltensperger, N. Bukowiecki, H. Lihavainen, N. Kivekäs, E. Asmi, P. P. Aalto, M. Kulmala  , A. Wiedensohler, W. Birmili, A. Hamed, C. O'Dowd, S. G. Jennings, R. Weller, H. Flentje, A. M. Fjǽraa, M. Fiebig, C. L. Myhre, A. G. Hallar, E. Swietlicki, A. Kristensson, P. Laj |
| 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 ; 13, no. 2 ; Nr. 13, no. 2 (2013-01-22), S.895-916 |
| Datensatznummer |
250017607
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| Publikation (Nr.) |
 copernicus.org/acp-13-895-2013.pdf |
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| Zusammenfassung |
| We have analysed the trends of total aerosol particle number concentrations
(N) measured at long-term measurement stations involved either in the Global
Atmosphere Watch (GAW) and/or EU infrastructure project ACTRIS. The sites are
located in Europe, North America, Antarctica, and on Pacific Ocean islands.
The majority of the sites showed clear decreasing trends both in the
full-length time series, and in the intra-site comparison period of
2001–2010, especially during the winter months. Several potential driving
processes for the observed trends were studied, and even though there are
some similarities between N trends and air temperature changes, the most
likely cause of many northern hemisphere trends was found to be decreases in
the anthropogenic emissions of primary particles, SO2 or some
co-emitted species. We could not find a consistent agreement between the
trends of N and particle optical properties in the few stations with long
time series of all of these properties. The trends of N and the proxies for
cloud condensation nuclei (CCN) were generally consistent in the few European
stations where the measurements were available. This work provides a useful
comparison analysis for modelling studies of trends in aerosol number
concentrations. |
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