Physics
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3702808m&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 2, CiteID L02808
Physics
8
Atmospheric Composition And Structure: Constituent Sources And Sinks, Atmospheric Composition And Structure: Troposphere: Composition And Chemistry
Scientific paper
Firn-air and ambient air measurements of CHF3 (HFC-23) from three excursions to Antarctica between 2001 and 2009 are used to construct a consistent Southern Hemisphere (SH) atmospheric history. The results show atmospheric mixing ratios of HFC-23 continuing to increase through 2008. Mean global emissions derived from this data for 2006-2008 are 13.5 ± 2 Gg/yr (200 ± 30 × 1012 gCO2-equivalent/yr, or MtCO2-eq./yr), ˜50% higher than the 8.7 ± 1 Gg/yr (130 ± 15 MtCO2-eq./yr) derived for the 1990s. HFC-23 emissions arise primarily from over-fluorination of chloroform during HCFC-22 production. The recent global emission increases are attributed to rapidly increasing HCFC-22 production in developing countries since reported HFC-23 emissions from developed countries decreased over this period. The emissions inferred here for developing countries during 2006-2008 averaged 11 ± 2 Gg/yr HFC-23 (160 ± 30 MtCO2-eq./yr) and are larger than the ˜6 Gg/yr of HFC-23 destroyed in United Nations Framework Convention on Climate Change Clean Development Mechanism projects during 2007 and 2008.
Aydın Meral
Battle Mark O.
Fahey David W.
Kuijpers L.
Montzka Stephen A.
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