Supporting Information
Emission estimates of methyl chloride from
industrial sources in China based on high
frequency atmospheric observations
Shanlan Li1, Mi-Kyung Park1, Chun Ok Jo1, Sunyoung Park1,2
1
Kyungpook Institute of Oceanography, College of Natural Sciences, Kyungpook National
University, Daegu 41566, South Korea
2
Department of Oceanography, School of Earth System Sciences, Kyungpook National
University, Daegu 41566, South Korea

Corresponding author phone: +82) 53 950 5393; fax: +82) 53 950 5397; e-mail:[email protected],
[email protected]
Figure S1. (a) Plot of C2H6 versus CH3Cl enhancements. For the subset of data with C2H6
enhancements > 600 pptv in 2011 when CO data were available, we found relatively compact
correlations of (b) CH3Cl vs. CO and of (c) COS vs.CO enhanced concentrations
Inverse model for HCFC-22 emission estimation
Emission rates of HCFC-22 were derived from Gosan measurements with a particle
dispersion model (FLEXPART) [Stohle et al., 2010; Fang et al., 2014]. We employed several
sources of information to define a priori emissions for HCFC-22. First, Montzka et al. (2009)
determined global emissions based on a large number of measurements taken at several sites
and a simple box model. They reported emissions of 375 Gg/yr for 2007, which we
extrapolated to 2008 by assuming a linear trend. For China, we directly used HCFC-22
bottom-up emissions of 79.3 Gg/yr reported by Wan et al. (2009). For all other countries, the
global emissions (minus emissions in China) were disaggregated to countries according to the
HCFC consumption data reported by United Nations Environment Programme
(http://www.unep.org/ozone) for 2008. Within the countries, the emissions were distributed
according to population taken from CIESIN (2010). We reduce and increase all emissions by
50% and repeat the inversions. For reporting national emissions, we also report the mean of
all inversions, and we characterize uncertainty by the standard deviation of all inversions
performed.
Figure S2. Annual HCFC-22 emissions (Gg/yr) in China determined by an inversion
calculation based on a particle dispersion model (FLEXPART) (black circle). Gray solid
circles represent a prior emissions of HCFC-22 used in the model.
Figure S3. Annual HCFCs production (ODP tones) reported by UNEP (UNEP, 2015) and
silicone production (Mt) in China obtained from http://www.cbcie.com/6812/0/list.html.
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