Analysis of a potential "solar radiation dose—dimethylsulfide—cloud condensation nuclei" link from globally mapped seasonal correlations
15 pages, 8 figures.
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| Format: | artículo biblioteca |
| Language: | English |
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American Geophysical Union
2007-07
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| Subjects: | Cloud condensation nuclei, Dimethylsulfide, Global-seasonal correlations, |
| Online Access: | http://hdl.handle.net/10261/11184 |
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dig-idaea-es-10261-111842019-03-07T01:46:17Z Analysis of a potential "solar radiation dose—dimethylsulfide—cloud condensation nuclei" link from globally mapped seasonal correlations Vallina, Sergio M. Simó, Rafel Gassó, S. Boyer-Montégut, C. de Río, Evilio del Jurado, Elena Dachs, Jordi Cloud condensation nuclei Dimethylsulfide Global-seasonal correlations 15 pages, 8 figures. The CLAW postulate states that an increase insolar irradiance or in the heat flux to the ocean can trigger a biogeochemical response to counteract the associated increase in temperature and available sunlight. This natural (negative) feedback mechanism would be based on a multistep response: first, an increase in seawater dimethylsulfide concentrations (DMSw) and therefore its fluxes to the atmosphere (DMSflux,); second, an increase in the atmospheric cloud condensation nuclei (CCN) burden as a consequence of DMS oxidation to form biogenic CCN (CCNbio); and third, an increase in cloud albedo due to higher CCN numbers. Monthly global climatological fields of the solar radiation dose in the upper mixed layer (SRD), surface oceanic DMSw, model outputs of hydroxyl radical concentrations (OH), and satellite-derived CCN numbers (CCNs) are analyzed in order to evaluate the proposed “solar radiation dose-DMSCCN” link from a global point of view. OH is included as the main atmospheric oxidant of the estimated DMSflux to produce CCNbio. Global maps of seasonal correlations between the variables show that the solar radiation dose is highly (positively) correlated with seawater dimethylsulfide over most of the global ocean and that atmospheric DMS oxidation is highly (positively) correlated with CCNs over large regions. These couplings are stronger at high latitudes, whereas dic regions with negative or no correlation are located at low latitudes around the equator. However, CCNbio estimates for 15 regions of the global ocean show that DMS oxidation can be an important contributor to the CCNs burden only over pollution-free regions, while it would have a minor contribution over regions with high loads of continental aerosols. Globally, the mean annual contribution of CCNbio to total CCNs is estimated to be about 30%. Our results support that an oceanic biogenic mechanism that modulates cloud formation and albedo can indeed occur, although its impact seems rather weak over regions under a strong influence of continental aerosols. Nevertheless, our approach does not fully rule out that the observed correlations are due to an independent seasonal variation of the studied variables; seasonal couplings are necessary but not sufficient conditions to prove the CLAW hypothesis. This work was supported by the Spanish Ministry of Education and Science through the projects AMIGOS (contract REN200 1-3462/CLI to R. S.) and MIMOSA (contract CTM2005-065 13 to R. S.), and a Ph.D. studentship (to S. M. V.), and by the Catalan Government through grant 2005SGR00021 (to R. S.). This is a contribution to the objectives of the international program Surface Ocean Lower Atmosphere Study (SOLAS) and the Network of Excellence EUROCEANS of the European Union’s 6th Framework Program. Peer reviewed 2009-03-03T12:03:04Z 2009-03-03T12:03:04Z 2007-07 artículo http://purl.org/coar/resource_type/c_6501 Global Biogeochemical Cycles 21(2): 1-15 (2007) 0886-6236 http://hdl.handle.net/10261/11184 10.1029/2006GB002787 en Publisher's version http://dx.doi.org/10.1029/2006GB002787 open 162 bytes application/msword American Geophysical Union |
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English |
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Cloud condensation nuclei Dimethylsulfide Global-seasonal correlations Cloud condensation nuclei Dimethylsulfide Global-seasonal correlations |
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Cloud condensation nuclei Dimethylsulfide Global-seasonal correlations Cloud condensation nuclei Dimethylsulfide Global-seasonal correlations Vallina, Sergio M. Simó, Rafel Gassó, S. Boyer-Montégut, C. de Río, Evilio del Jurado, Elena Dachs, Jordi Analysis of a potential "solar radiation dose—dimethylsulfide—cloud condensation nuclei" link from globally mapped seasonal correlations |
| description |
15 pages, 8 figures. |
| format |
artículo |
| topic_facet |
Cloud condensation nuclei Dimethylsulfide Global-seasonal correlations |
| author |
Vallina, Sergio M. Simó, Rafel Gassó, S. Boyer-Montégut, C. de Río, Evilio del Jurado, Elena Dachs, Jordi |
| author_facet |
Vallina, Sergio M. Simó, Rafel Gassó, S. Boyer-Montégut, C. de Río, Evilio del Jurado, Elena Dachs, Jordi |
| author_sort |
Vallina, Sergio M. |
| title |
Analysis of a potential "solar radiation dose—dimethylsulfide—cloud condensation nuclei" link from globally mapped seasonal correlations |
| title_short |
Analysis of a potential "solar radiation dose—dimethylsulfide—cloud condensation nuclei" link from globally mapped seasonal correlations |
| title_full |
Analysis of a potential "solar radiation dose—dimethylsulfide—cloud condensation nuclei" link from globally mapped seasonal correlations |
| title_fullStr |
Analysis of a potential "solar radiation dose—dimethylsulfide—cloud condensation nuclei" link from globally mapped seasonal correlations |
| title_full_unstemmed |
Analysis of a potential "solar radiation dose—dimethylsulfide—cloud condensation nuclei" link from globally mapped seasonal correlations |
| title_sort |
analysis of a potential "solar radiation dose—dimethylsulfide—cloud condensation nuclei" link from globally mapped seasonal correlations |
| publisher |
American Geophysical Union |
| publishDate |
2007-07 |
| url |
http://hdl.handle.net/10261/11184 |
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