Publication

Aerosol decadal trends – part 2: in-situ aerosol particle number concentrations at gaw and actris stations

Asmi, A.
; 
Collaud Coen, M.
; 
Ogren, J. A.
; 
Andrews, E.
; 
Sheridan, P.
; 
Jefferson, A.
; 
Weingartner, E.
; 
Baltensperger, U.
; 
Bukowiecki, N.
; 
Lihavainen, H.
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Identifiers
http://hdl.handle.net/10379/10300
https://doi.org/10.13025/28262
Repository DOI
10.5194/acp-13-895-2013
Publication Date
2013-01-22
Keywords
bend regional aerosol, size distributions, air-quality, boundary-layer, source apportionment, northern-hemisphere, atmospheric aerosol, particulate matter, seasonal-variation, background sites
Type
Article
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Citation
Asmi, A. Collaud Coen, M.; Ogren, J. A.; Andrews, E.; Sheridan, P.; Jefferson, A.; Weingartner, E.; Baltensperger, U.; Bukowiecki, N.; Lihavainen, H.; Kivekäs, N.; Asmi, E.; Aalto, P. P.; Kulmala, M.; Wiedensohler, A.; Birmili, W.; Hamed, A.; O'Dowd, C.; G Jennings, S.; Weller, R.; Flentje, H.; Fjaeraa, A. M.; Fiebig, M.; Myhre, C. L.; Hallar, A. G.; Swietlicki, E.; Kristensson, A.; 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), 895-916
Abstract
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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Publisher
Copernicus GmbH
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Attribution-NonCommercial-NoDerivs 3.0 Ireland
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Externally hosted open access publications with University of Galway authors (2)