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| Titel |
Sources and chemical characterization of organic aerosol during the summer in the eastern Mediterranean |
| VerfasserIn |
E. Kostenidou, K. Florou, C. Kaltsonoudis, M. Tsiflikiotou, S. Vratolis, K. Eleftheriadis, 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 ; 15, no. 19 ; Nr. 15, no. 19 (2015-10-13), S.11355-11371 |
| Datensatznummer |
250120094
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| Publikation (Nr.) |
 copernicus.org/acp-15-11355-2015.pdf |
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| Zusammenfassung |
The concentration and chemical composition of non-refractory fine
particulate matter (NR-PM1) and black carbon (BC) levels were measured
during the summer of 2012 in the suburbs of two Greek cities, Patras and
Athens, in an effort to better understand the chemical processing of
particles in the high photochemical activity environment of the eastern
Mediterranean. The composition of PM1 was surprisingly similar in both
areas, demonstrating the importance of regional sources for the corresponding
pollution levels. The PM1 average mass concentration was 9–14 μg m−3. The contribution of sulfate was around 38 %, while organic
aerosol (OA) contributed approximately 45 % in both cases. PM1
nitrate levels were low (2 %). The oxygen to carbon (O : C) atomic ratio was
0.50 ± 0.08 in Patras and 0.47 ± 0.11 in Athens. In both cases
PM1 was acidic.
Positive matrix factorization (PMF) was applied to the high-resolution
organic aerosol mass spectra obtained by an Aerodyne High-Resolution
Time-of-Flight Aerosol Mass Spectrometer (HR-ToF-AMS). For Patras, five OA
sources could be identified: 19 % very oxygenated OA (V-OOA), 38 %
moderately oxygenated OA (M-OOA), 21 % biogenic oxygenated OA (b-OOA),
7 % hydrocarbon-like OA (HOA-1) associated with traffic sources and 15 %
hydrocarbon-like OA (HOA-2) related to other primary emissions (including
cooking OA). For Athens, the corresponding source contributions were: V-OOA
(35 %), M-OOA (30 %), HOA-1 (18 %) and HOA-2 (17 %). In both cities
the major component was OOA, suggesting that under high photochemical
conditions most of the OA in the eastern Mediterranean is quite aged. The
contribution of the primary sources (HOA-1 and HOA-2) was important (22 %
in Patras and 35 % in Athens) but not dominant. |
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