Details for Wind speed dependent size-resolved parameterization for the organic enrichment of sea spray

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Name:Wind speed dependent size-resolved parameterization for the organic enrichment of sea spray
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Gantt, B, N. Meskhidze, M.C. Facchini, M. Rinaldi, D. Ceburnis, C.D. O’Dowd, Wind speed dependent size-resolved parameterization for the organic enrichment of sea spray, Atmos. Chem. Phys., 11, 1–13, 2011, www.atmos-chem-phys.net/11/1/2011/doi:10.5194/acp-11-1-2011


Abstract: For oceans to become a significant source of primary organic aerosol, sea spray 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 (OMss).  To test this hypothesis, we developed a new marine primary organic aerosol 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 meter wind speed and surface chlorophyll-a concentration ([Chl-a]) are the most consistent predictors of OMss.  This relationship, combined the published aerosol size dependence of OMss, resulted in a new parameterization for the organic carbon fraction of sea spray.  Global marine primary organic emission is investigated here by applying this newly-developed relationship to existing sea spray emission functions, satellite-derived [Chl-a], and modeled 10 meter winds.  Analysis of model simulations show 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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