期刊
ATMOSPHERIC CHEMISTRY AND PHYSICS
卷 10, 期 9, 页码 4111-4131出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/acp-10-4111-2010
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资金
- US Department of Energy Biological and Environmental Research [DE-FG02-05ER63983]
- US Environmental Protection Agency [RD-83374901]
- US NSF [ATM-0432377]
The elemental composition of laboratory chamber secondary organic aerosol (SOA) from glyoxal uptake, alpha-pinene ozonolysis, isoprene photooxidation, single-ring aromatic photooxidation, and naphthalene photooxidation is evaluated using Aerodyne high-resolution time-of-flight mass spectrometer data. SOA O/C ratios range from 1.13 for glyoxal uptake experiments to 0.30-0.43 for alpha-pinene ozonolysis. The elemental composition of alpha-pinene and naphthalene SOA is also confirmed by offline mass spectrometry. The fraction of organic signal at m/z 44 is generally a good measure of SOA oxygenation for alpha-pinene/O-3, isoprene/high-NOx, and naphthalene SOA systems. The agreement between measured and estimated O/C ratios tends to get closer as the fraction of organic signal at m/z 44 increases. This is in contrast to the glyoxal uptake system, in which m/z 44 substantially underpredicts O/C. Although chamber SOA has generally been considered less oxygenated than ambient SOA, single-ring aromatic- and naphthalene-derived SOA can reach O/C ratios upward of 0.7, well within the range of ambient PMF component OOA, though still not as high as some ambient measurements. The spectra of aromatic and isoprene-high-NOx SOA resemble that of OOA, but the spectrum of glyoxal uptake does not resemble that of any ambient organic aerosol PMF component.
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