Wind speed dependent size-resolved parameterization for the organic mass fraction of sea spray aerosol
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 para...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2011-08-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | http://www.atmos-chem-phys.net/11/8777/2011/acp-11-8777-2011.pdf |
| _version_ | 1819020373619900416 |
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| author | B. Gantt N. Meskhidze M. C. Facchini M. Rinaldi D. Ceburnis C. D. O'Dowd |
| author_facet | B. Gantt N. Meskhidze M. C. Facchini M. Rinaldi D. Ceburnis C. D. O'Dowd |
| author_sort | B. Gantt |
| collection | DOAJ |
| description | 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 (OM<sub>SSA</sub>). 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-<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 OM<sub>SSA</sub>. This relationship, combined with the published aerosol size dependence of OM<sub>SSA</sub>, 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-<i>a</i>], 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<sup>−1</sup>. This study provides additional evidence that marine primary organic aerosols are a globally significant source of organics in the atmosphere. |
| first_indexed | 2024-12-21T03:50:11Z |
| format | Article |
| id | doaj.art-450e68b80403412da349b2b0089e4c75 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-12-21T03:50:11Z |
| publishDate | 2011-08-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-450e68b80403412da349b2b0089e4c752022-12-21T19:16:59ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242011-08-0111168777879010.5194/acp-11-8777-2011Wind speed dependent size-resolved parameterization for the organic mass fraction of sea spray aerosolB. GanttN. MeskhidzeM. C. FacchiniM. RinaldiD. CeburnisC. D. O'DowdFor 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 (OM<sub>SSA</sub>). 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-<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 OM<sub>SSA</sub>. This relationship, combined with the published aerosol size dependence of OM<sub>SSA</sub>, 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-<i>a</i>], 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<sup>−1</sup>. This study provides additional evidence that marine primary organic aerosols are a globally significant source of organics in the atmosphere.http://www.atmos-chem-phys.net/11/8777/2011/acp-11-8777-2011.pdf |
| spellingShingle | B. Gantt N. Meskhidze M. C. Facchini M. Rinaldi D. Ceburnis C. D. O'Dowd Wind speed dependent size-resolved parameterization for the organic mass fraction of sea spray aerosol Atmospheric Chemistry and Physics |
| title | Wind speed dependent size-resolved parameterization for the organic mass fraction of sea spray aerosol |
| title_full | Wind speed dependent size-resolved parameterization for the organic mass fraction of sea spray aerosol |
| title_fullStr | Wind speed dependent size-resolved parameterization for the organic mass fraction of sea spray aerosol |
| title_full_unstemmed | Wind speed dependent size-resolved parameterization for the organic mass fraction of sea spray aerosol |
| title_short | Wind speed dependent size-resolved parameterization for the organic mass fraction of sea spray aerosol |
| title_sort | wind speed dependent size resolved parameterization for the organic mass fraction of sea spray aerosol |
| url | http://www.atmos-chem-phys.net/11/8777/2011/acp-11-8777-2011.pdf |
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