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| Titel |
The physical and chemical characteristics of marine primary organic aerosol: a review |
| VerfasserIn |
B. Gantt, N. Meskhidze |
| 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 ; 13, no. 8 ; Nr. 13, no. 8 (2013-04-18), S.3979-3996 |
| Datensatznummer |
250018592
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| Publikation (Nr.) |
 copernicus.org/acp-13-3979-2013.pdf |
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| Zusammenfassung |
| Knowledge of the physical characteristics and chemical composition of marine
organic aerosols is needed for the quantification of their effects on solar
radiation transfer and cloud processes. This review examines research
pertinent to the chemical composition, size distribution, mixing state,
emission mechanism, photochemical oxidation and climatic impact of marine
primary organic aerosol (POA) associated with sea-spray. Numerous
measurements have shown that both the ambient mass concentration of marine
POA and size-resolved organic mass fraction of sea-spray aerosol are related
to surface ocean biological activity. Recent studies have also indicated that
fine mode (smaller than 200 nm in diameter) marine POA can have a size
distribution independent from sea-salt, while coarse mode aerosols (larger
than 1000 nm in diameter) are more likely to be internally mixed with
sea-salt. Modelling studies have estimated global submicron marine POA
emission rates of ~10 ± 5 Tg yr−1, with a considerable
fraction of these emissions occurring over regions most susceptible to
aerosol perturbations. Climate studies have found that marine POA can cause
large local increases in the cloud condensation nuclei concentration and have
a non-negligible influence on model assessments of the anthropogenic aerosol
forcing of climate. Despite these signs of climate-relevance, the source
strength, chemical composition, mixing state, hygroscopicity, cloud droplet
activation potential, atmospheric aging and removal of marine POA remain
poorly quantified. Additional laboratory, field, and modelling studies focused
on the chemistry, size distribution and mixing state of marine POA are
needed to better understand and quantify their importance. |
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