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| Titel |
Organics in the Northeastern Pacific and their impacts on aerosol hygroscopicity in the subsaturated and supersaturated regimes |
| VerfasserIn |
K. C. Kaku, D. A. Hegg, D. S. Covert, J. L. Santarpia, H. Jonsson, G. Buzorius, D. R. Collins |
| 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 ; 6, no. 12 ; Nr. 6, no. 12 (2006-09-13), S.4101-4115 |
| Datensatznummer |
250004109
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| Publikation (Nr.) |
 copernicus.org/acp-6-4101-2006.pdf |
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| Zusammenfassung |
| Aerosol samples were collected by aircraft during
the summer of 2004 in the Northeastern Pacific and
compared to measurements of
aerosol hygroscopicity. Chemical speciation analyses of the samples revealed that a significant portion
of the marine aerosols was organic, and on average 8% of the total
aerosol mass was insoluble organic material, tentatively attributed to natural
marine emissions.
Two chemical models were explored in an attempt to achieve closure
between the marine aerosol chemical and physical properties through
reproduction of the
observed aerosol growth, both in the subsaturated and
supersaturated regimes. Results suggest that at subsaturated relative
humidities, the nonideal behavior of water activity with respect to
aerosol chemistry has an important effect on aerosol growth. At
supersaturations, the underprediction of critical supersaturations by
all models suggests the hypothesis that formation of a complete
monolayer by the insoluble organics may inhibit the activation of
aerosols to form cloud droplets. |
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