ACPD Atmospheric Chemistry and Physics Discussions ACPD 1680-7375 Copernicus GmbH Göttingen, Germany 10.5194/acpd-11-425-2011 Wind speed dependent size-resolved parameterization for the organic enrichment of sea spray Gantt B. 1 Meskhidze N. 1 Department of Marine, Earth, and Atmospheric Sciences, North Carolina State University, Raleigh, NC, USA 07 01 2011 11 1 425 452 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys-discuss.net/11/425/2011/acpd-11-425-2011.html The full text article is available as a PDF file from http://www.atmos-chem-phys-discuss.net/11/425/2011/acpd-11-425-2011.pdf

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 fraction of sea spray aerosol (OC<sub>ss</sub>). 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-<i>a</i>, 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-<i>a</i> concentration ([Chl-<i>a</i>]) are the most consistent predictors of OC<sub>ss</sub>. This relationship, combined with the published aerosol size dependence of OC<sub>ss</sub>, 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-<i>a</i>], and modeled 10 m winds. Analysis of model simulations show that global annual submicron marine organic emission associated with sea spray is estimated to be from 2.1 to 5.3 Tg C yr<sup>−1</sup>. This study provides additional evidence that marine primary organic aerosols are a globally significant source of organics in the atmosphere.

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