|Title||Increase in HFC-134a emissions in response to the success of the Montreal Protocol|
|Publication Type||Journal Article|
|Year of Publication||2015|
|Authors||Fortems-Cheiney A., Saunois M., Pison I., Chevallier F, Bousquet P., Cressot C., Montzka SA, Fraser PJ, Vollmer M.K, Simmonds PG, Young D, O'Doherty S, Weiss RF, Artuso F., Barletta B., Blake D.R, Li S., Lunder C., Miller B.R, Park S., Prinn R., Saito T., Steele LP, Yokouchi Y.|
|Journal||Journal of Geophysical Research-Atmospheres|
|Type of Article||Article|
|Keywords||2 decades; california; global emissions; halocarbon emissions; halogenated greenhouse gases; hcfc-22; inversion; methyl chloroform; sensitivity; variability|
The 1,1,1,2-tetrafluoroethane (HFC-134a), an important alternative to CFC-12 in accordance with the Montreal Protocol on Substances that Deplete the Ozone Layer, is a high global warming potential greenhouse gas. Here we evaluate variations in global and regional HFC-134a emissions and emission trends, from 1995 to 2010, at a relatively high spatial and temporal (3.75 degrees in longitude x 2.5 degrees in latitude and 8 day) resolution, using surface HFC-134a measurements. Our results show a progressive increase of global HFC-134a emissions from 19 +/- 2 Gg/yr in 1995 to 167 +/- 5 Gg/yr in 2010, with both a slowdown in developed countries and a 20%/yr increase in China since 2005. A seasonal cycle is also seen since 2002, which becomes enhanced over time, with larger values during the boreal summer.