ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-10-7425-2010 Quantification of DMS aerosol-cloud-climate interactions using the ECHAM5-HAMMOZ model in a current climate scenario Thomas M. A. 1 Suntharalingam P. 1 Pozzoli L. 2 Rast S. 3 Devasthale A. 4 Kloster S. 5 6 Feichter J. 3 Lenton T. M. 1 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 now at: Max Planck Institute for Meteorology, Hamburg, Germany 10 08 2010 10 15 7425 7438 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/10/7425/2010/acp-10-7425-2010.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/10/7425/2010/acp-10-7425-2010.pdf

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. We estimate a maximum decrease of up to 15–18% in the droplet radius and a mean increase in cloud cover by around 2.5% over the southern oceans during SH summer in the simulation with ocean DMS compared to when the DMS emissions are switched off. The global annual mean top of the atmosphere DMS aerosol all sky radiative forcing is −2.03 W/m<sup>2</sup>, whereas, over the southern oceans during SH summer, the mean DMS aerosol radiative forcing reaches −9.32 W/m<sup>2</sup>.

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