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., 5, 715-737, doi:10.5194/acp-5-715-2005, 2005.