Aerosol Effects on Precipitation Locally and Globally

  • U. Lohmann
Part of the Advances in Global Change Research book series (AGLO, volume 33)

Abstract

The question of whether anthropogenic emissions of aerosols or their precursors can contribute to droughts and heavy precipitation events is still an open one. While there is a microphysical link between an increase in aerosols and an increase in cloud albedo, a direct link to surface precipitation is less straight forward because it involves interactions between cloud microphysics and dynamics. Locally it has been suggested that in some instances increases in aerosols can increase heavy precipitation because less precipitation is formed in the lower parts of convective clouds so that more latent heat is released when the cloud glaciates. Globally the dominant effect of aerosols on precipitation is that aerosols cool the surface due to the increased aerosol and cloud optical depth, which then reduces evaporation and, hence, precipitation.

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Copyright information

© Springer Science + Business Media B.V 2008

Authors and Affiliations

  • U. Lohmann
    • 1
  1. 1.Institute of Atmospheric and Climate ScienceZurichSwitzerland

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