Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 42, Issue 20, Pages 8702-8710Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2015GL065846
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Funding
- Swiss Federal Office for the Environment (FOEN) within the project HALCLIM
- International Foundation High Altitude Research Stations Jungfraujoch and Gornergrat (HFSJG)
- Department of Energy and Climate Change (DECC, UK) [GA0201]
- Australian Bureau of Meteorology
- CSIRO
- Swiss State Secretariat for Education and Research and Innovation (SERI)
- National Research Foundation of Korea for the Korean-Swiss Science and Technology Cooperation Program
- UK NERC [NE/J016012]
- National Centre for Atmospheric Science (NCAS)
- Taiwan Ministry of Science and Technology
- UK Natural Environment Research Council (NERC) [NE/1021365/1, NE/1021918/1]
- Korean Polar Research Programs [PE13410, PP15101]
- Award NERC IOF [NE/J016012/1]
- NERC Studentship
- NERC [NE/J016012/1, NE/L013088/1, NE/F021194/1, ncas10006, NE/I021918/1, NE/I021365/1] Funding Source: UKRI
- Natural Environment Research Council [NE/F021194/1, NE/I021918/1, 1210143, NER/T/S/2000/01040, NE/L013088/1, NE/J016012/1, ncas10006, NE/I021365/1] Funding Source: researchfish
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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 0.50ppt in 2012-mid-2013 followed by an abrupt drop to similar to 0.44 ppt by early 2015. Global emissions derived from these observations peaked at 3.1kt in 2011, followed by a rapid decline of similar to 0.5 ktyr(-2) to reach 1.5 ktyr(-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 ktyr(-1) although emission hot spots were identified in France.
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