Aerosol bacteria over the Southern Ocean during ACE-1 |
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Authors: | Mih ly P sfai, Jia Li, James R. Anderson,Peter R. Buseck |
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Affiliation: | a Department of Earth and Environmental Sciences, University of Veszprém, POB 158, Veszprém H-8200, Hungary;b Departments of Geological Sciences and Chemistry/Biochemistry, Arizona State University, Tempe, AZ 85287-1404, USA;c Department of Mechanical/Aerospace Engineering, Arizona State University, Tempe, AZ 85287-6106, USA |
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Abstract: | Individual bacterial cells occur in many samples that were collected at Cape Grim, Tasmania and during the Lagrangian “B” experiment of the Aerosol Characterization Experiment 1 (ACE-1) campaign that was conducted above the Southern Ocean. They are present in samples from altitudes as high as 5.4 km. Morphologically, almost all bacteria are rod-shaped, about 1 μm long or smaller, have one polar flagellum, and contain inclusions that are rich in P and K. Their morphological features suggest that these bacteria are motile, marine species. It seems likely that the cells became airborne by the same bubble-bursting mechanism that ejects sea-salt aerosol particles into the atmosphere; however, the bacteria and sea-salt particles are typically not aggregated with one another. The estimated number ratio of bacteria and the dominant aerosol species, sea salt, varies in the samples and averages about 1%. The aerosol bacteria seem to represent an important atmospheric reservoir of P and organic compounds; on the other hand, since they are externally mixed with sea salt, they are unlikely to be effective as cloud condensation nuclei. |
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Keywords: | Marine aerosol Bacteria Individual particles ACE-1 Airborne bacteria |
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