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The dominant removal mechanism of soluble aerosol is wet deposition. Theatmospheric lifetime of aerosol, relevant for aerosol radiative forcing, istherefore coupled to the atmospheric cycling time of water vapor. This studyinvestigates the coupling between water vapor and aerosol lifetimes in awell-mixed atmosphere. Based on a steady-state study by Pruppacher andJaenicke (1995) we describe the coupling in terms of the processingefficiency of air by clouds and the efficiencies of water vaporcondensation, of aerosol activation, and of the transfer from cloud water toprecipitation. We extend this to expressions for the temperature responsesof the water vapor and aerosol lifetimes. Previous climate model results(Held and Soden, 2006) suggest a water vapor lifetime temperature responseof +5.3 ± 2.0% K<sup>−1</sup>. This can be used as a first guess for theaerosol lifetime temperature response, but temperature sensitivities of theaerosol lifetime simulated in recent aerosol–climate model studies extendbeyond this range and include negative values. This indicates that otherinfluences probably have a larger impact on the computed aerosol lifetimethan its temperature response, more specifically changes in the spatialdistributions of aerosol (precursor) emissions and precipitation patterns,and changes in the activation efficiency of aerosol. These are notquantitatively evaluated in this study but we present suggestions for modelexperiments that may help to understand and quantify the different factorsthat determine the aerosol atmospheric lifetime

A steady-state analysis of the temperature responses of water vapor and aerosol lifetimes