Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 4 2008 10.5194/acpd-8-14105-2008 http://www.atmos-chem-phys-discuss.net/8/14105/2008/ http://www.atmos-chem-phys-discuss.net/8/14105/2008/acpd-8-14105-2008.html http://www.atmos-chem-phys-discuss.net/8/14105/2008/acpd-8-14105-2008.pdf 14105 14143 2008-07-23 Measurements of the relation between aerosol properties and microphysics and chemistry of low clouds in northern Finland H. Lihavainen heikki.lihavainen@fmi.fi V.-M. Kerminen M. Komppula A.-P. Hyvärinen J. Laakia S. Saarikoski U. Makkonen N. Kivekäs R. Hillamo M. Kulmala Y. Viisanen Finnish Meteorological Institute, Research and Development, P. O. Box 503, 00 101 Helsinki, Finland University of Helsinki, Department of Physics, P. O. Box 64, 00 014, Finland Physical and chemical properties of boundary layer clouds, together with relevant aerosol properties, were investigated during the first Pallas Cloud Experiment (First PaCE) conducted in northern Finland between 20 October and 9 November, 2004. Two stations located 6 km apart from each other at different altitudes were employed in measurements. The low-altitude station was always below the cloud layer, whereas the high-altitude station was inside clouds about 75% of the time during the campaign. Direct measurements of cloud droplet populations showed that our earlier approach of determining cloud droplet residual particle size distributions and corresponding activated fractions using continuous aerosol number size distribution measurements at the two stations is valid, as long as the cloud events are carefully screened to exclude precipitating clouds and to make sure the same air mass has been measured at both stations. 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