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| Titel |
Wind speed dependent size-resolved parameterization for the organic mass fraction of sea spray aerosol |
| VerfasserIn |
B. Gantt, N. Meskhidze, M. C. Facchini, M. Rinaldi, D. Ceburnis, C. D. O'Dowd |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 16 ; Nr. 11, no. 16 (2011-08-30), S.8777-8790 |
| Datensatznummer |
250010036
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| Publikation (Nr.) |
 copernicus.org/acp-11-8777-2011.pdf |
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| Zusammenfassung |
| For oceans to be a significant source of primary organic aerosol (POA), sea
spray aerosol (SSA) must be highly enriched with organics relative to the
bulk seawater. We propose that organic enrichment at the air-sea interface,
chemical composition of seawater, and the aerosol size are three main
parameters controlling the organic mass fraction of sea spray aerosol
(OMSSA). To test this hypothesis, we developed a new marine POA
emission function based on a conceptual relationship between the organic
enrichment at the air-sea interface and surface wind speed. The resulting
parameterization is explored using aerosol chemical composition and surface
wind speed from Atlantic and Pacific coastal stations, and satellite-derived
ocean concentrations of chlorophyll-a, dissolved organic carbon, and
particulate organic carbon. Of all the parameters examined, a multi-variable
logistic regression revealed that the combination of 10 m wind speed and
surface chlorophyll-a concentration ([Chl-a]) are the most consistent
predictors of OMSSA. This relationship, combined with the published
aerosol size dependence of OMSSA, resulted in a new parameterization
for the organic mass fraction of SSA. Global emissions of marine POA are
investigated here by applying this newly-developed relationship to existing
sea spray emission functions, satellite-derived [Chl-a], and modeled 10 m
winds. Analysis of model simulations shows that global annual submicron
marine organic emission associated with sea spray is estimated to be from
2.8 to 5.6 Tg C yr−1. This study provides additional evidence that
marine primary organic aerosols are a globally significant source of
organics in the atmosphere. |
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