Journal
ATMOSPHERIC CHEMISTRY AND PHYSICS
Volume 15, Issue 19, Pages 11355-11371Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/acp-15-11355-2015
Keywords
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Funding
- European Research Council Project ATMOPACS (Atmospheric Organic Particulate Matter, Air Quality and Climate Change Studies) [267099]
- European FP7 project PEGASOS
- European Union (European Social Fund - ESF)
- Greek national funds through the Operational Program Education and Lifelong Learning of the National Strategic Reference Framework (NSRF) - Research Funding Program: THALES
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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 mu g 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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