Abrupt reversal in emissions and atmospheric abundance of HCFC-133a (CF3CH2Cl)
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- Abrupt reversal in emissions and atmospheric abundance of HCFC-133a (CF3CH2Cl)
- Vollmer, Martin K.
Laube, Johannes C.
Rhee, Tae Siek
Gooch, Lauren J.
Steele, L. Paul
Langenfelds, Ray L.
Brenninkmeijer, Carl A. M.
Wyss, Simon A.
Oram, David E.
Krummel, Paul B.
Fraser, Paul J.
Sturges, William T.
- Atmospheric abundances; Emission; HCFC-133a
- Issue Date
- Vollmer, Martin K., et al. 2015. Abrupt reversal in emissions and atmospheric abundance of HCFC-133a (CF3CH2Cl). Geophysical Research Letters, 42: 8702-8710.
- Hydrochlorofluorocarbon HCFC-133a (CF3CH2Cl) is an anthropogenic compound whose
consumption for emissive use is restricted under the Montreal Protocol. A recent study showed rapidly
increasing atmospheric abundances and emissions. We report that, following this rise, the atmospheric
abundance and emissions have declined sharply in the past three years. We find a Northern Hemisphere
HCFC-133a increase from 0.13 ppt (dry-air mole fraction in parts per trillion) in 2000 to 0.50 ppt in
2012-mid-2013 followed by an abrupt drop to ∼0.44 ppt by early 2015. Global emissions derived from these
observations peaked at 3.1 kt in 2011, followed by a rapid decline of ∼0.5 kt yr-2 to reach 1.5 kt yr-1 in 2014.
Sporadic HCFC-133a pollution events are detected in Europe from our high-resolution HCFC-133a records at three European stations, and in Asia from samples collected in Taiwan. European emissions are estimated to
be <0.1 kt yr-1 although emission hot spots were identified in France.
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