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| Titel |
Water content of aged aerosol |
| VerfasserIn |
G. J. Engelhart, L. Hildebrandt, E. Kostenidou, N. Mihalopoulos, N. M. Donahue, S. N. Pandis |
| 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 ; 11, no. 3 ; Nr. 11, no. 3 (2011-02-01), S.911-920 |
| Datensatznummer |
250009281
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| Publikation (Nr.) |
 copernicus.org/acp-11-911-2011.pdf |
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| Zusammenfassung |
| The composition and physical properties of aged atmospheric aerosol were
characterized at a remote sampling site on the northern coast of Crete,
Greece during the Finokalia Aerosol Measurement Experiment in May 2008
(FAME-2008). A reduced Dry-Ambient Aerosol Size Spectrometer (DAASS) was
deployed to measure the aerosol water content and volumetric growth factor
of fine particulate matter. The particles remained wet even at relative
humidity (RH) as low as 20%. The aerosol was acidic during most of the
measurement campaign, which likely contributed to the water uptake at low
RH. The water content observations were compared to the thermodynamic model
E-AIM, neglecting any contribution of the organics to aerosol water content.
There was good agreement between the water measurements and the model
predictions. Adding the small amount of water associated with the organic
aerosol based on monoterpene water absorption did not change the quality of
the agreement. These results strongly suggest that the water uptake by aged
organic aerosol is relatively small (a few percent of the total water for
the conditions during FAME-08) and generally consistent with what has been
observed in laboratory experiments. The water concentration measured by a
Q-AMS was well correlated with the DAASS measurements and in good agreement
with the predicted values for the RH of the Q-AMS inlet. This suggests that,
at least for the conditions of the study, the Q-AMS can provide valuable
information about the aerosol water concentrations if the sample is not
dried. |
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