Journal
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
Volume 108, Issue D21, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2003JD003545
Keywords
bacteria; cloud condensation nuclei; bioaerosols; cloud water
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Bacteria cultivated from aerosol and cloud water samples collected at a remote Austrian mountain site under wintry conditions were tested for their ability to act as cloud condensation nuclei (CCN). The experiment was carried out with a cloud condensation nuclei counter (CCNC) operating on the principle of a static thermal diffusion chamber. Average concentrations of cultivable airborne bacteria amounted to 8 colony forming units (CFU) m(-3) in aerosol samples and to 79 CFU mL(-1) in cloud water. The set of tested bacteria comprised Gram positive and Gram negative but no known ice nucleating species. At supersaturations between 0.07 and 0.11% all types of bacteria were activated as CCN. As the sizes of the bacteria were smaller than the Kelvin diameters for the respective supersaturations, the physico-chemical properties of their outer cell walls must have enhanced their CCN activity.
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