A series of high-frequency observations of chlorodifluoromethane (HCFC-22) at Hateruma Island (latitude 24.1N, longitude 123.8E) was used to evaluate the strength of various sources in East Asia by a tracer transport inversion. The forward calculation was conducted with a regional meteorological model using an online tracer transport scheme, and the inversion calculation used a Bayesian approach. On the basis of winter observations during 2005-2007, we estimated the annual HCFC-22 emission from China to be 32 Gg, which is nine times current estimates. The total uncertainty of the Chinese emission was reduced from 50% (a priori) to 15% (a posteriori) by the inversion calculation. A sensitivity study showed that the a posteriori values for China showed little dependency on the a priori values, whereas those for Japan, Korea, and Taiwan were considerably affected by the a priori values used. This can be explained by the more frequent high-concentration events from China observed at the Hateruma site. The a posteriori emission estimates from central China accounted for half of the total emissions from China. Copyright 2010 by the American Geophysical Union.
CITATION STYLE
Shirai, T., Yokouchi, Y., Sugata, S., & Maksyutov, S. (2010). HCFC-22 flux estimates over East Asia by inverse modeling from hourly observations at Hateruma monitoring station. Journal of Geophysical Research Atmospheres, 115(15). https://doi.org/10.1029/2009JD012858
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