Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 7 17 2007 10.5194/acp-7-4625-2007 http://www.atmos-chem-phys.net/7/4625/2007/ http://www.atmos-chem-phys.net/7/4625/2007/acp-7-4625-2007.html http://www.atmos-chem-phys.net/7/4625/2007/acp-7-4625-2007.pdf 4625 4637 2007-09-12 On the contribution of Aitken mode particles to cloud droplet populations at continental background areas – a parametric sensitivity study T. Anttila tatu.anttila@fmi.fi V.-M. Kerminen Finnish Meteorological Institute, Research and Development, P.O. Box 503, 00101 Finland Aitken mode particles are potentially an important source of cloud droplets in continental background areas. In order to find out which physico-chemical properties of Aitken mode particles are most important regarding their cloud-nucleating ability, we calculated the number of cloud droplets formed on Aitken mode particles, CD2, with an adiabatic air parcel model. 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