U Lohmann

Institute for Atmospheric and Climate Science, ETH Zurich, Universitatsstr. 16, CH-8092 Zurich, Switzerland (E-mail: [email protected] ethz.ch)

(Received 23 August 2005; Accepted in final form 3 November 2005)

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 I discuss the multitude of effects.

Keywords: aerosols, clouds, climate

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