Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 10 2 2010 10.5194/acpd-10-3087-2010 http://www.atmos-chem-phys-discuss.net/10/3087/2010/ http://www.atmos-chem-phys-discuss.net/10/3087/2010/acpd-10-3087-2010.html http://www.atmos-chem-phys-discuss.net/10/3087/2010/acpd-10-3087-2010.pdf 3087 3127 2010-02-05 Quantification of DMS aerosol-cloud-climate interactions using ECHAM5-HAMMOZ model in current climate scenario M. A. Thomas manu.thomas@uea.ac.uk P. Suntharalingam L. Pozzoli S. Rast A. Devasthale S. Kloster J. Feichter T. M. Lenton School of Environmental Sciences, University of East Anglia, Norwich, UK Climate Change Unit, Joint Research Center, Italy Max-Planck-Institute for Meteorology, Hamburg, Germany Swedish Meteorological and Hydrological Institute, Norrkoping, Sweden Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, USA The contribution of ocean dimethyl sulfide (DMS) emissions to changes in cloud microphysical properties is quantified seasonally and globally for present day climate conditions using an aerosol-chemistry-climate general circulation model, ECHAM5-HAMMOZ, coupled to a cloud microphysics scheme. We evaluate DMS aerosol-cloud-climate linkages over the southern oceans where anthropogenic influence is minimal. The changes in the number of activated particles, cloud droplet number concentration (CDNC), cloud droplet effective radius, cloud cover and the radiative forcing are examined by analyzing two simulations: a baseline simulation with ocean DMS emissions derived from a prescribed climatology and one in which the ocean DMS emissions are switched off. Our simulations show that the model realistically simulates the seasonality in the number of activated particles and CDNC, peaking during Southern Hemisphere (SH) summer coincident with increased phytoplankton blooms and gradually declining with a minimum in SH winter. In comparison to a simulation with no DMS, the CDNC level over the southern oceans is 128% larger in the baseline simulation averaged over the austral summer months. Our results also show an increased number of smaller sized cloud droplets during this period. 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