Sources and chemical characterization of organic aerosol during the summer in the eastern Mediterranean
Item
Title (Dublin Core)
Sources and chemical characterization of organic aerosol during the summer in the eastern Mediterranean
Description (Dublin Core)
The concentration and chemical composition of non-refractory fine particulate matter (NR-PM<sub>1</sub>) 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 PM<sub>1</sub> was surprisingly similar in both areas, demonstrating the importance of regional sources for the corresponding pollution levels. The PM<sub>1</sub> average mass concentration was 9–14 μg m<sup>−3</sup>. The contribution of sulfate was around 38 %, while organic aerosol (OA) contributed approximately 45 % in both cases. PM<sub>1</sub> 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 PM<sub>1</sub> was acidic. <br><br> 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.
Creator (Dublin Core)
Kostenidou, E.
Florou, K.
Kaltsonoudis, C.
Tsiflikiotou, M.
Vratolis, S.
Eleftheriadis, K.
Pandis, S. N.
Date (Dublin Core)
2018-09-10
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acp-15-11355-2015
https://acp.copernicus.org/articles/15/11355/2015/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
