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| Titel |
Hygroscopic properties of smoke-generated organic aerosol particles emitted in the marine atmosphere |
| VerfasserIn |
A. Wonaschütz, M. Coggon, A. Sorooshian, R. Modini, A. A. Frossard, L. Ahlm, J. Mülmenstädt, G. C. Roberts, L. M. Russell, S. Dey, F. J. Brechtel, J. H. Seinfeld |
| 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. 19 ; Nr. 13, no. 19 (2013-10-07), S.9819-9835 |
| Datensatznummer |
250085733
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| Publikation (Nr.) |
 copernicus.org/acp-13-9819-2013.pdf |
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| Zusammenfassung |
| During the Eastern Pacific Emitted Aerosol Cloud Experiment (E-PEACE), a
plume of organic aerosol was produced by a smoke generator and emitted into
the marine atmosphere from aboard the R/V Point Sur. In this study,
the hygroscopic properties and the chemical composition of the plume were
studied at plume ages between 0 and 4 h in different meteorological
conditions. In sunny conditions, the plume particles had very low
hygroscopic growth factors (GFs): between 1.05 and 1.09 for 30 nm and between 1.02 and 1.1
for 150 nm dry size at a relative humidity (RH) of 92%, contrasted by
an average marine background GF of 1.6. New particles were produced in large
quantities (several 10 000 cm−3), which lead to substantially increased
cloud condensation nuclei (CCN) concentrations at supersaturations between
0.07 and 0.88%. Ratios of oxygen to carbon (O : C) and water-soluble organic
mass (WSOM) increased with plume age: from < 0.001 to 0.2, and from
2.42 to 4.96 μg m−3, respectively, while organic mass fractions
decreased slightly (~ 0.97 to ~ 0.94).
High-resolution aerosol mass spectrometer (AMS) spectra show that the
organic fragment m/z 43 was dominated by C2H3O+ in the small,
new particle mode and by C3H7+ in the large particle mode. In
the marine background aerosol, GFs for 150 nm particles at 40% RH were
found to be enhanced at higher organic mass fractions: an average GF of 1.06
was observed for aerosols with an organic mass fraction of 0.53, and a GF of
1.04 for an organic mass fraction of 0.35. |
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