Quantifying the impacts of an updated global dimethyl sulfide climatology on cloud microphysics and aerosol radiative forcing
13 pages, 5 figures, supporting information http://dx.doi.org/10.1002/2014JD022687
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dig-icm-es-10261-1176292022-09-09T10:37:22Z Quantifying the impacts of an updated global dimethyl sulfide climatology on cloud microphysics and aerosol radiative forcing Mahajan, Anoop S. Fadnavis, Suvarna Thomas, Manu A. Pozzoli, Luca Gupta, Smrati Royer, S.-J. Saiz-Lopez, A. Simó, Rafel 13 pages, 5 figures, supporting information http://dx.doi.org/10.1002/2014JD022687 One of the critical parameters in assessing the global impacts of dimethyl sulfide (DMS) on cloud properties and the radiation budget is the estimation of phytoplankton-induced ocean emissions, which are derived from prescribed, climatological surface seawater DMS concentrations. The most widely used global ocean DMS climatology was published 15 years ago and has recently been updated using a much larger database of observations. The updated climatology displays significant differences in terms of the global distribution and regional monthly averages of sea surface DMS. In this study, we use the ECHAM5-HAMMOZ aerosol-chemistry-climate general circulation model to quantify the influence of the updated DMS climatology in computed atmospheric properties, namely, the spatial and temporal distributions of atmospheric DMS concentration, sulfuric acid concentration, sulfate aerosols, number of activated aerosols, cloud droplet number concentration, and the aerosol radiative forcing at the top of the atmosphere. Significant differences are observed for all the modeled variables. Comparison with observations of atmospheric DMS and total sulfate also shows that in places with large DMS emissions, the updated climatology shows a better match with the observations. This highlights the importance of using the updated climatology for projecting future impacts of oceanic DMS emissions, especially considering that the relative importance of the natural sulfur fluxes is likely to increase due to legislation to “clean up” anthropogenic emissions. The largest estimated differences are in the Southern Ocean, Indian Ocean, and parts of the Pacific Ocean, where the climatologies differ in seasonal concentrations over large geographical areas. The model results also indicate that the former DMS climatology underestimated the effect of DMS on the globally averaged annual aerosol radiative forcing at the top of the atmosphere by about 20% The Indian Institute of Tropical Meteorology is supported by the Ministry of Earth Sciences, Government of India. S.-J.R. and R.S. acknowledge support from the former Spanish Ministry of Science and Innovation through projects PRISMA and Malaspina 2010 Peer Reviewed 2015-03 2015-07-07T07:08:04Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1002/2014JD022687 issn: 2169-897X e-issn: 2169-8996 Journal of Geophysical Research: Atmospheres 120(6): 2524–2536 (2015) http://hdl.handle.net/10261/117629 10.1002/2014JD022687 http://dx.doi.org/10.1002/2014JD022687 open American Geophysical Union |
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13 pages, 5 figures, supporting information http://dx.doi.org/10.1002/2014JD022687 |
| format |
artículo |
| author |
Mahajan, Anoop S. Fadnavis, Suvarna Thomas, Manu A. Pozzoli, Luca Gupta, Smrati Royer, S.-J. Saiz-Lopez, A. Simó, Rafel |
| spellingShingle |
Mahajan, Anoop S. Fadnavis, Suvarna Thomas, Manu A. Pozzoli, Luca Gupta, Smrati Royer, S.-J. Saiz-Lopez, A. Simó, Rafel Quantifying the impacts of an updated global dimethyl sulfide climatology on cloud microphysics and aerosol radiative forcing |
| author_facet |
Mahajan, Anoop S. Fadnavis, Suvarna Thomas, Manu A. Pozzoli, Luca Gupta, Smrati Royer, S.-J. Saiz-Lopez, A. Simó, Rafel |
| author_sort |
Mahajan, Anoop S. |
| title |
Quantifying the impacts of an updated global dimethyl sulfide climatology on cloud microphysics and aerosol radiative forcing |
| title_short |
Quantifying the impacts of an updated global dimethyl sulfide climatology on cloud microphysics and aerosol radiative forcing |
| title_full |
Quantifying the impacts of an updated global dimethyl sulfide climatology on cloud microphysics and aerosol radiative forcing |
| title_fullStr |
Quantifying the impacts of an updated global dimethyl sulfide climatology on cloud microphysics and aerosol radiative forcing |
| title_full_unstemmed |
Quantifying the impacts of an updated global dimethyl sulfide climatology on cloud microphysics and aerosol radiative forcing |
| title_sort |
quantifying the impacts of an updated global dimethyl sulfide climatology on cloud microphysics and aerosol radiative forcing |
| publisher |
American Geophysical Union |
| url |
http://hdl.handle.net/10261/117629 |
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