Aerosol decadal trends - Part 2: In-situ aerosol particle number concentrations at GAW and ACTRIS stations

Asmi, A. and Coen, M. Collaud and Ogren, J. A. and Andrews, E. and Sheridan, P. and Jefferson, A. and Weingartner, E. and Baltensperger, U. and Bukowiecki, N. and Lihavainen, H. and Kivekäs, N. and Asmi, E. and Aalto, P. P. and Kulmala, M. and Wiedensohler, A. and Birmili, W. and Hamed, A. and O'Dowd, C. and Jennings, S. G. and Weller, R. and Flentje, H. and Fjaeraa, A. M. and Fiebig, M. and Myhre, C. L. and Hallar, A. G. and Swietlicki, E. and Kristensson, A. and Laj, P.. (2013) Aerosol decadal trends - Part 2: In-situ aerosol particle number concentrations at GAW and ACTRIS stations. Atmospheric Chemistry and Physics, 13 (2). pp. 895-916.

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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.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Geowissenschaften > Atmospheric Sciences (Kalberer)
UniBasel Contributors:Bukowiecki, Nicolas
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:European Geosciences Union
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:16 Dec 2020 16:28
Deposited On:16 Dec 2020 16:28

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