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| Titel |
Characterization of volatile organic compounds (VOCs) in Asian and north American pollution plumes during INTEX-B: identification of specific Chinese air mass tracers |
| VerfasserIn |
B. Barletta, S. Meinardi, I. J. Simpson, E. L. Atlas, A. J. Beyersdorf, A. K. Baker, N. J. Blake, M. Yang, J. R. Midyett, B. J. Novak, R. J. McKeachie, H. E. Fuelberg, G. W. Sachse, M. A. Avery, T. Campos, A. J. Weinheimer, F. S. Rowland, D. R. Blake |
| 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 ; 9, no. 14 ; Nr. 9, no. 14 (2009-07-30), S.5371-5388 |
| Datensatznummer |
250007547
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| Publikation (Nr.) |
 copernicus.org/acp-9-5371-2009.pdf |
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| Zusammenfassung |
We present results from the Intercontinental Chemical Transport Experiment
– Phase B (INTEX-B) aircraft mission conducted in spring 2006. By analyzing
the mixing ratios of volatile organic compounds (VOCs) measured during the
second part of the field campaign, together with kinematic back
trajectories, we were able to identify five plumes originating from China,
four plumes from other Asian regions, and three plumes from the United
States. To identify specific tracers for the different air masses we
characterized their VOC composition and we compared their background levels
with those obtained during the 2004 INTEX-A mission. The Chinese and other
Asian air masses were significantly enhanced in carbonyl sulfide (OCS) and
methyl chloride (CH3Cl), while all CFC replacement compounds were
elevated in US plumes, particularly HFC-134a.
Although elevated mixing ratios of Halon-1211 were measured in some Chinese
plume samples, several measurements at background levels were also observed.
After analyzing the VOC distribution and correlations within the Chinese
pollution plumes and applying principal component analysis (PCA), we suggest
the use of a suite of species, rather than a single gas, as specific tracers
of Chinese air masses (namely OCS, CH3Cl, 1,2-dichloroethane, ethyl
chloride, and Halon-1211). In an era of constantly changing halocarbon usage
patterns, this suite of gases best reflects new emission characteristics
from China. |
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