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| Titel |
Chemical composition and hygroscopic properties of aerosol particles over the Aegean Sea |
| VerfasserIn |
S. Bezantakos, K. Barmpounis, M. Giamarelou, E. Bossioli, M. Tombrou, N. Mihalopoulos, K. Eleftheriadis, J. Kalogiros, J. D. Allan, A. Bacak, C. J. Percival, H. Coe, G. Biskos |
| 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. 22 ; Nr. 13, no. 22 (2013-11-29), S.11595-11608 |
| Datensatznummer |
250085844
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| Publikation (Nr.) |
 copernicus.org/acp-13-11595-2013.pdf |
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| Zusammenfassung |
| The chemical composition and water uptake characteristics of sub-micrometre
atmospheric particles over the region of the Aegean Sea were measured between
25 August and 11 September 2011 within the framework of the Aegean-Game campaign.
High temporal-resolution measurements of the chemical composition of the
particles were conducted using an airborne compact time-of-flight aerosol
mass spectrometer (cToF-AMS). These measurements were performed during two
flights from the island of Crete to the island of Lemnos and back. A
hygroscopic tandem differential mobility analyser (HTDMA) located on the
island of Lemnos was used to measure the ability of the particles to take up
water. The HTDMA measurements showed that the particles in the dominant mode
were internally mixed, having hygroscopic growth factors that ranged from
1.00 to 1.59 when exposed to 85% relative humidity. When the aircraft flew
near the ground station on Lemnos, the cToF-AMS measurements showed that the
organic volume fraction of the particles ranged from 43 to 56%. These
measurements corroborate the range of hygroscopic growth factors measured by
the HTDMA during that time. Good closure between HTDMA and cToF-AMS
measurements was achieved when assuming that the organic species were less
hygroscopic and had an average density that corresponds to aged organic
species. Using the results from the closure study, the cToF-AMS measurements
were employed to determine vertical profiles of a representative aerosol
hygroscopic parameter κmix. Calculated κmix
values ranged from 0.19 to 0.84 during the first flight and from 0.22 to 0.80
during the second flight. Air masses of different origin as determined by
back trajectory calculations can explain the spatial variation in chemical
composition and κmix values of the particles observed in the
region. |
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