Articles | Volume 10, issue 15
Atmos. Chem. Phys., 10, 7425–7438, 2010
Atmos. Chem. Phys., 10, 7425–7438, 2010

  10 Aug 2010

10 Aug 2010

Quantification of DMS aerosol-cloud-climate interactions using the ECHAM5-HAMMOZ model in a current climate scenario

M. A. Thomas1, P. Suntharalingam1, L. Pozzoli2, S. Rast3, A. Devasthale4, S. Kloster5,*, J. Feichter3, and T. M. Lenton1 M. A. Thomas et al.
  • 1School of Environmental Sciences, University of East Anglia, Norwich, UK
  • 2Climate Change Unit, Joint Research Center, Italy
  • 3Max-Planck-Institute for Meteorology, Hamburg, Germany
  • 4Swedish Meteorological and Hydrological Institute, Norrkoping, Sweden
  • 5Earth and Atmospheric Sciences, Cornell University, Ithaca, NY, USA
  • *now at: Max Planck Institute for Meteorology, Hamburg, Germany

Abstract. 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/m2, whereas, over the southern oceans during SH summer, the mean DMS aerosol radiative forcing reaches −9.32 W/m2.

Final-revised paper