Abstract
This chapter discusses the variation of Cloud Condensation Nuclei (CCN) spectra at Palmer Station, Antarctica. CCN activity spectra and meteorological data were measured between February 12 and February 26, 1994. The CCN spectra were typical of a marine location. The meteorological and CCN spectral data indicate a significant change in the total CCN concentration measured in association with the sampling near the fog-free boundary of different air masses or air parcels, including those from evaporating clouds. These measurements show that the temporal variation of CCN spectra can be used to obtain information concerning air-mass transport and mixing without making the measurements within cloudy air.
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