Atmospheric Chemistry and Physics
www.atmos-chem-phys.net
1680-7316
1680-7324
9
23
2009
10.5194/acp-9-9263-2009
http://www.atmos-chem-phys.net/9/9263/2009/
http://www.atmos-chem-phys.net/9/9263/2009/acp-9-9263-2009.html
http://www.atmos-chem-phys.net/9/9263/2009/acp-9-9263-2009.pdf
9263
9280
2009-12-10
Bacteria in the global atmosphere – Part 1: Review and synthesis of literature data for different ecosystems
S. M. Burrows
W. Elbert
M. G. Lawrence
U. Pöschl
Max Planck Institute for Chemistry, Mainz, Germany
Bacteria are ubiquitous in the atmosphere, with concentrations of
bacterial cells typically exceeding 1×10<sup>4</sup> m<sup>−3</sup> over
land. Numerous studies have suggested that the presence of bacteria
in the atmosphere may impact cloud development, atmospheric
chemistry, and microbial biogeography. A sound knowledge of
bacterial concentrations and distributions in the atmosphere is
needed to evaluate these claims. This review focusses on published
measurements of total and culturable bacteria concentrations in the
atmospheric aerosol. We discuss emission mechanisms and the impacts
of meteorological conditions and measurement techniques on measured
bacteria concentrations. Based on the literature reviewed, we
suggest representative values and ranges for the mean concentration
in the near-surface air of nine natural ecosystems and three
human-influenced land types. We discuss the gaps in current
knowledge of bacterial concentrations in air, including the lack of
reliable, long-term measurements of the total microbial
concentrations in many regions and the scarcity of emission flux
measurements.
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