References

ACP

Atmospheric Chemistry and Physics

ACP

1680-7324

Copernicus GmbH

Göttingen, Germany

10.5194/acp-13-895-2013

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

Asmi

¹ ¹⁶ Collaud Coen

² Ogren

J. A.

³ Andrews

³ ⁴ Sheridan

³ Jefferson

³ ⁴ Weingartner

⁵ Baltensperger

⁵ Bukowiecki

⁵ Lihavainen

⁶ Kivekäs

⁶ Asmi

⁶ Aalto

P. P.

¹ Kulmala

¹ Wiedensohler

⁷ Birmili

⁷ Hamed

⁷ ⁸ O'Dowd

⁹ G Jennings

⁹ Weller

¹⁰ Flentje

¹¹ Fjaeraa

A. M.

¹² Fiebig

¹² Myhre

C. L.

¹² Hallar

A. G.

¹³ Swietlicki

¹⁴ Kristensson

¹⁴ Laj

¹⁵

Department of Physics, University of Helsinki, P.O. Box 64, 00014, Finland

Federal Office of Meteorology and Climatology, MeteoSwiss, 1530 Payerne, Switzerland

NOAA Earth System Research Laboratory, Boulder, USA

Cooperative Institute for Research in Environmental Science, University of Colorado, Boulder, USA

Paul Scherrer Institute, Laboratory of Atmospheric Chemistry, 5232 Villigen, Switzerland

Finnish Meteorological Institute, Erik Palmenin aukio 1, 00560 Helsinki, Finland

Leibniz Institute for Tropospheric Research, Permoserstrasse 15, 04318 Leipzig, Germany

Department of Applied Physics, University of Eastern Finland, Kuopio, Finland

School of Physics and Centre for Climate & Air Pollution Studies, Ryan Institute, National University of Ireland Galway, University Road, Galway, Ireland

Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany

Deutscher Wetterdienst, Meteorological Observatory Hohenpeissenberg, Albin-Schwaiger-Weg 10, 82383 Hohenpeissenberg, Germany

NILU – Norwegian Institute for Air Research, Instituttveien 18, 2027 Kjeller, Norway

Desert Research Institute, Storm Peak Laboratory Division of Atmospheric Sciences, Steamboat Springs,USA

Division of Nuclear Physics, Lund University, P.O. Box 118, 22100 Lund, Sweden

UJF-Grenoble 1/CNRS, LGGE, UMR5183, Grenoble, 38041, France

Laboratoire de Météorologie Physique, CNRS-Université Blaise Pascal, UMR6016, Clermont Ferrand, France

22 01 2013

13 2 895 916

This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

This article is available from http://www.atmos-chem-phys.net/13/895/2013/acp-13-895-2013.html

The full text article is available as a PDF file from http://www.atmos-chem-phys.net/13/895/2013/acp-13-895-2013.pdf

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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