| Autor: |
Vollmer, Martin K., Rigby, Matt, Laube, Johannes C., Henne, Stephan, Rhee, Tae Siek, Gooch, Lauren J., Wenger, Angelina, Young, Dickon, Steele, L. Paul, Langenfelds, Ray L., Brenninkmeijer, Carl A. M., Wang, Jia‐Lin, Ou‐Yang, Chang‐Feng, Wyss, Simon A., Hill, Matthias, Oram, David E., Krummel, Paul B., Schoenenberger, Fabian, Zellweger, Christoph, Fraser, Paul J., Sturges, William T., O'Doherty, Simon, Reimann, Stefan |
| Zdroj: |
Geophysical Research Letters; October 2015, Vol. 42 Issue: 20 p8702-8710, 9p |
| Abstrakt: |
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−2to reach 1.5 kt yr−1in 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−1although emission hot spots were identified in France. Atmospheric abundances of HCFC‐133a and emissions have suddenly reversed in the last three yearsThe sources of HCFC‐133a to the atmosphere are likely from the production of HFC‐134aIn Europe, the emissions of HCFC‐133a are less than 0.1 kt/yr while globally about 1.5 kt/yr |
| Databáze: |
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