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Modelling sea salt aerosol and its direct and indirect effects on climate

Abstract : A size-dependent sea salt aerosol parameterization was developed based on the piecewise log-normal approximation (PLA) for aerosol size distributions. Results of this parameterization from simulations with a global climate model produce good agreement with observations at the surface and for vertically-integrated volume size distributions. The global and annual mean of the sea salt burden is 10.1 mg m?2. The direct radiative forcing is calculated to be ?1.52 and ?0.60 W m?2 for clear sky and all sky, respectively. The first indirect radiative forcing is about twice as large as the direct forcing for all-sky (?1.34 W m?2). The results also show that the total indirect forcing of sea salt is ?2.9 W m?2 if climatic feedbacks are taken into account. The sensitivity of the forcings to changes in the burdens and sizes of sea salt particles was also investigated based on additional simulations with a different sea salt source function.
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Submitted on : Thursday, March 6, 2008 - 8:00:00 AM
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  • HAL Id : hal-00296476, version 1

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X. Ma, K. von Salzen, J. Li. Modelling sea salt aerosol and its direct and indirect effects on climate. Atmospheric Chemistry and Physics, European Geosciences Union, 2008, 8 (5), pp.1311-1327. ⟨hal-00296476⟩

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