Airborne bacteria as cloud condensation nuclei
| Autor: | H. Giebl, Franziska Zibuschka, Regina Hitzenberger, Heidi Bauer, Anne Kasper-Giebl, Georg Reischl, Hans Puxbaum |
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| Rok vydání: | 2003 |
| Předmět: |
Diffusion chamber
Atmospheric Science Indoor bioaerosol Soil Science Cloud water Aquatic Science Oceanography complex mixtures Geochemistry and Petrology Earth and Planetary Sciences (miscellaneous) Cloud condensation nuclei Earth-Surface Processes Water Science and Technology Hydrology Supersaturation Ecology biology Chemistry Paleontology Forestry biology.organism_classification Aerosol Geophysics Space and Planetary Science Environmental chemistry CCNC Bacteria |
| Zdroj: | Journal of Geophysical Research: Atmospheres. 108 |
| ISSN: | 0148-0227 |
| DOI: | 10.1029/2003jd003545 |
| Popis: | [1] 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. |
| Databáze: | OpenAIRE |
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