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Physical and chemical properties of boundary layer clouds, together withrelevant aerosol properties, were investigated during the first Pallas CloudExperiment (First Pace) conducted in northern Finland between 20 October and9 November 2004. Two stations located 6 km apart from each other atdifferent altitudes were employed in measurements. The low-altitude stationwas always below the cloud layer, whereas the high-altitude station wasinside clouds about 75% of the time during the campaign. Direct measurementsof cloud droplet populations showed that our earlier approach of determiningcloud droplet residual particle size distributions and correspondingactivated fractions using continuous aerosol number size distributionmeasurements at the two stations is valid, as long as the cloud events arecarefully screened to exclude precipitating clouds and to make sure the sameair mass has been measured at both stations. We observed that anon-negligible fraction of cloud droplets originated from Aitken modeparticles even at moderately-polluted air masses. We found clear evidence onfirst indirect aerosol effect on clouds but demonstrated also that no simplerelation between the cloud droplet number concentration and aerosol particlenumber concentration exists for this type of clouds. The chemical compositionof aerosol particles was dominated by particulate organic matter (POM) andsulphate in continental air masses and POM, sodium and chlorine in marine airmasses. The inorganic composition of cloud water behaved similarly to that ofthe aerosol phase and was not influenced by inorganic trace gases

Measurements of the relation between aerosol properties and microphysics and chemistry of low level liquid water clouds in Northern Finland