Abstract
Abstract. The emissions of three hydrochlorofluorocarbons, HCFC-22 (CHClF2), HCFC-141b (CH3CCl2F) and HCFC-142b (CH3CClF2) and three hydrofluorocarbons, HFC-23 (CHF3), HFC-134a (CH2FCF3) and HFC-152a (CH3CHF2) from four East Asian countries and the Taiwan region for the year 2008 are determined by inverse modeling. The inverse modeling is based on in-situ measurements of these halocarbons at the Japanese stations Cape Ochi-ishi and Hateruma, the Chinese station Shangdianzi and the South Korean station Gosan. For every station and every 3 h, 20-day backward calculations were made with the Lagrangian particle dispersion model FLEXPART. The model output, the measurement data, bottom-up emission information and corresponding uncertainties were fed into an inversion algorithm to determine the regional emission fluxes. The model captures the observed variation of halocarbon mixing ratios very well for the two Japanese stations but has difficulties explaining the large observed variability at Shangdianzi, which is partly caused by small-scale transport from Beijing that is not adequately captured by the model. Based on HFC-23 measurements, the inversion algorithm could successfully identify the locations of factories known to produce HCFC-22 and emit HFC-23 as an unintentional byproduct. This lends substantial credibility to the inversion method. We report national emissions for China, North Korea, South Korea and Japan, as well as emissions for the Taiwan region. Halocarbon emissions in China are much larger than the emissions in the other countries together and contribute a substantial fraction to the global emissions. Our estimates of Chinese emissions for the year 2008 are 65.3±6.6 kt/yr for HCFC-22 (17% of global emissions extrapolated from Montzka et al., 2009), 12.1±1.6 kt/yr for HCFC-141b (22%), 7.3±0.7 kt/yr for HCFC-142b (17%), 6.2±0.7 kt/yr for HFC-23 (>50%), 12.9±1.7 kt/yr for HFC-134a (9% of global emissions estimated from Velders et al., 2009) and 3.4±0.5 kt/yr for HFC-152a (7%).
Highlights
The emissions of chlorofluorocarbons (CFCs) and halons have decreased substantially over the last decade and will decrease further as a result of the phaseout of their production and use required by the Montreal Protocol
HCFC-22 is the most abundant of the hydrochlorofluorocarbons measured in the atmosphere and has a lifetime of about www.atmos-chem-phys.net/10/3545/2010/
We have used an inversion method based on atmospheric measurement data, bottom-up emission information and an atmospheric transport model to improve regional estimates for East Asia for the year 2008 of the emissions of three hydrochlorofluorocarbons (HCFC-22, HCFC-141b, HCFC142b) and three hydrofluorocarbons
Summary
The emissions of chlorofluorocarbons (CFCs) and halons have decreased substantially over the last decade and will decrease further as a result of the phaseout of their production and use required by the Montreal Protocol. Blake et al (2003) and Palmer et al (2003) calculated CFC emissions from China based on downwind aircraft measurement data but their studies did not include HCFCs or HFCs. While for Japan, top-down estimates are available (Yokouchi et al, 2005; Stohl et al, 2009), for the Taiwan region, South Korea and North Korea, there exists even less information than for China This motivated the present study which uses measurement data from several stations in East Asia, an atmospheric transport model and an inversion algorithm to compute HCFC and HFC emissions for several countries in East Asia (mainland China including Hong Kong and Macao abbreviated as ”China” in the following, North Korea, South Korea, Japan) as well as the Taiwan region
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