Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 8 3 2008 10.5194/acp-8-445-2008 http://www.atmos-chem-phys.net/8/445/2008/ http://www.atmos-chem-phys.net/8/445/2008/acp-8-445-2008.html http://www.atmos-chem-phys.net/8/445/2008/acp-8-445-2008.pdf 445 462 2008-02-01 Changes in aerosol properties during spring-summer period in the Arctic troposphere A.-C. Engvall anki@misu.su.se R. Krejci J. Ström R. Treffeisen R. Scheele O. Hermansen J. Paatero Department of Meteorology, Stockholm University, Stockholm, 10691, Sweden Department of Applied Environmental Science – Atmospheric Science Unit, Stockholm University, Stockholm, 10691, Sweden Norwegian Polar Institute, 9296 Tromsø , Norway Alfred-Wegener-Institut für Polar- und Meeresforschung, Telegrafenberg A43, 14473 Potsdam, Germany Koninklijk Nederlands Meteorologisch Instituut, Postbus201, 3730, AE, De Bilt, The Netherlands Norsk institutt for luftforskning, Postboks100, 2027 Kjeller, Norway Finnish Meteorological Institute, P.O.B. 503, 00101 Helsinki, Finland The change in aerosol properties during the transition from the more polluted spring to the clean summer in the Arctic troposphere was studied. A six-year data set of observations from Ny-Ålesund on Svalbard, covering the months April through June, serve as the basis for the characterisation of this time period. In addition four-day-back trajectories were used to describe air mass histories. 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