Articles | Volume 10, issue 8
Atmos. Chem. Phys., 10, 3545–3560, 2010
Atmos. Chem. Phys., 10, 3545–3560, 2010

  16 Apr 2010

16 Apr 2010

Hydrochlorofluorocarbon and hydrofluorocarbon emissions in East Asia determined by inverse modeling

A. Stohl1, J. Kim2, S. Li2, S. O'Doherty3, J. Mühle4, P. K. Salameh4, T. Saito5, M. K. Vollmer6, D. Wan7, R. F. Weiss4, B. Yao8, Y. Yokouchi5, and L. X. Zhou8 A. Stohl et al.
  • 1Norwegian Institute for Air Research, Kjeller, Norway
  • 2School of Earth and Environmental Sciences, Seoul National University, Seoul, Korea
  • 3School of Chemistry, University of Bristol, Bristol, UK
  • 4Scripps Institution of Oceanography, University of California, San Diego, California, USA
  • 5National Institute for Environmental Studies, Tsukuba, Japan
  • 6Swiss Federal Laboratories for Materials Testing and Research (Empa), Duebendorf, Switzerland
  • 7State Key Joint Laboratory for Environmental Simulation and Pollution Control, Peking University, Beijing, China
  • 8Centre for Atmosphere Watch and Services, Key Laboratory for Atmospheric Chemistry, Chinese Academy of Meteorological Sciences, Beijing, China

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%).

Final-revised paper