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We present results from the Intercontinental Chemical Transport Experiment– Phase B (INTEX-B) aircraft mission conducted in spring 2006. By analyzingthe mixing ratios of volatile organic compounds (VOCs) measured during thesecond part of the field campaign, together with kinematic backtrajectories, we were able to identify five plumes originating from China,four plumes from other Asian regions, and three plumes from the UnitedStates. To identify specific tracers for the different air masses wecharacterized their VOC composition and we compared their background levelswith those obtained during the 2004 INTEX-A mission. The Chinese and otherAsian air masses were significantly enhanced in carbonyl sulfide (OCS) andmethyl chloride (CH3Cl), while all CFC replacement compounds wereelevated in US plumes, particularly HFC-134a. Although elevated mixing ratios of Halon-1211 were measured in some Chineseplume samples, several measurements at background levels were also observed.After analyzing the VOC distribution and correlations within the Chinesepollution plumes and applying principal component analysis (PCA), we suggestthe use of a suite of species, rather than a single gas, as specific tracersof Chinese air masses (namely OCS, CH3Cl, 1,2-dichloroethane, ethylchloride, and Halon-1211). In an era of constantly changing halocarbon usagepatterns, this suite of gases best reflects new emission characteristicsfrom China

atmospheric chemistry and physics

Characterization of volatile organic compounds (VOCs) in Asian and north American pollution plumes during INTEX-B: identification of specific Chinese air mass tracers