Atmos. Chem. Phys. Discuss., 11, 1457-1488, 2011
© Author(s) 2011. This work is distributed
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Bacteria in the ECHAM5-HAM global climate model
A. Sesartic1, U. Lohmann1, and T. Storelvmo2
1ETH Zurich, Institute for Atmospheric and Climate Science, 8092 Zurich, Switzerland
2Department of Geology and Geophysics, Yale University, New Haven, CT, USA

Abstract. Bacteria are the most active naturally occuring ice nuclei (IN) due to the ice nucleation active proteins on their surface, which serve as active sites for ice nucleation. Their potential impact on clouds and precipitation is not well known and needs to be investigated. Bacteria as a new aerosol species were introduced into the global climate model (GCM) ECHAM5-HAM. The inclusion of bacteria acting as IN in a GCM leads to only minor changes in cloud formation and precipitation on a global level, however, changes in the liquid water path and ice water path can be observed, specifically in the boreal regions where tundra and forests act as sources of bacteria.

Citation: Sesartic, A., Lohmann, U., and Storelvmo, T.: Bacteria in the ECHAM5-HAM global climate model, Atmos. Chem. Phys. Discuss., 11, 1457-1488, doi:10.5194/acpd-11-1457-2011, 2011.
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