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First observations, trends, and emissions of HCFC-31 (CH2ClF) in the global atmosphere

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Title
First observations, trends, and emissions of HCFC-31 (CH2ClF) in the global atmosphere
Authors
Fabian Schoenenberger
Stefan Reimann
Thomas Peter
Rhee, Tae Siek
Ray L. Langenfelds
Paul B. Krummel
Paul J. Fraser
Matthias Hill
Matt Rigby
Martin K. Vollmer
Subject
Geology
Keywords
Atmosphere; CH2ClF; HCFC-31
Issue Date
2015
Citation
Fabian Schoenenberger, et al. 2015. "First observations, trends, and emissions of HCFC-31 (CH2ClF) in the global atmosphere". GEOPHYSICAL RESEARCH LETTERS, 42(18): 7817-7824.
Abstract
We report the first multiyear atmospheric record of HCFC-31 (CH2ClF), based on flask samples and in situ analyses of air from both hemispheres. Although HCFC-31 has never been produced in large amounts, observedmole fractions in the Northern Hemisphere increased from 2000 onward, reaching 170 ppq(parts per quadrillion, 10 15) in 2011?2012 before decreasing rapidly. By combining our observations with a two-dimensional atmospheric chemistry-transport model, we infer an increase in global emissions from 240 t yr 1 in 2000 to 840 t yr 1 in 2011?2012, followed by a relatively fast decline to 570 t yr 1 in 2014. Emissions of HCFC-31 originate most probably from intermediate product release during the manufacturing process of HFC-32 (CH2F2). The rapid decline in recent years could be due to changes in production methods rather than declines in diffusive sources such as landfills or HCFC-31 contaminations in merchandised HFC-32.
URI
http://repository.kopri.re.kr/handle/201206/6098
DOI
http://dx.doi.org/10.1002/2015GL064709
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