A potent greenhouse gas identified in the atmosphere: SF(5)CF(3)
We detected a compound previously unreported in the atmosphere, trifluoromethyl sulfur pentafluoride (SF(5)CF(3)). Measurements of its infrared absorption cross section show SF(5)CF(3) to have a radiative forcing of 0.57 watt per square meter per parts per billion. This is the largest radiative forcing, on a per molecule basis, of any gas found in the atmosphere to date. Antarctic firn measurements show it to have grown from near zero in the late 1960s to about 0.12 part per trillion in 1999. It is presently growing by about 0.008 part per trillion per year, or 6% per year. Stratospheric profiles of SF(5)CF(3) suggest that it is long-lived in the atmosphere (on the order of 1000 years).
Sturges
WT
School of Environmental Sciences, University of East Anglia, Norwich NR4 7TJ, UK. Ford Motor Company, Mail Drop SRL-3083, Dearborn, MI 48121-2053, USA. Department of Meteorology, University of Reading, Reading RG6 6BB, UK. Institute for Meteorology.
Wallington
TJ
Hurley
MD
Shine
KP
Sihra
K
Engel
A
Oram
DE
Penkett
SA
Mulvaney
R
Brenninkmeijer
CA