Atmos. Chem. Phys. Discuss., 4, 7561-7614, 2004
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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.
Global indirect aerosol effects: a review
U. Lohmann1 and J. Feichter2
1ETH Institute of Atmospheric and Climate Science, Schafmattstr. 30, CH-8093 Zurich, Switzerland
2Max Planck Institute for Meteorology, Bundesstr. 53, D-20146 Hamburg, Germany

Abstract. Aerosols affect the climate system by changing cloud characteristics in many ways. They act as cloud condensation and ice nuclei, they may inhibit freezing and they could have an influence on the hydrological cycle. While the cloud albedo enhancement (Twomey effect) of warm clouds received most attention so far and traditionally is the only indirect aerosol forcing considered in transient climate simulations, here we discuss the multitude of effects. Different approaches how the climatic implications of these aerosol effects can be estimated globally as well as improvements that are needed in global climate models in order to better represent indirect aerosol effects are discussed in this paper.

Citation: Lohmann, U. and Feichter, J.: Global indirect aerosol effects: a review, Atmos. Chem. Phys. Discuss., 4, 7561-7614, doi:10.5194/acpd-4-7561-2004, 2004.
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