Publication Date:
2013-06-11
Description:
[1] HCFC-22 (CHClF2, chlorodifluoromethane) is an ozone-depleting substance, the consumption of which is controlled under the Montreal Protocol. Within a Bayesian inversion framework, we use measurements of HCFC-22 atmospheric concentrations to constrainestimates of HCFC-22 emissions, at the grid-point 3.75° × 2.5° and 8-day resolution, from January 1995 to December 2010. Starting from a new gridded bottom-up inventory which is then optimized, our method shows continuously rising global emissions, from 182 ± 11 Gg in 1995, to the maximum of 410 ± 9 Gg in 2009. This is mainly due to an increase of emissions in developing regions, particularly in Eastern Asia, and occurs despite the current phase-out in developed countries. The high temporal resolution of our inversion (8-day) allows to reveal some of the emission seasonality, the global posterior sources ranging from 25 Gg/month in November to 42 Gg/month in July, for example, in 2010.
Print ISSN:
0148-0227
Topics:
Geosciences
,
Physics