February 28, 2007
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Global Climate Change Digest
A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999
FROM VOLUME 5, NUMBER 12, DECEMBER 1992
OZONE DEPLETION POTENTIALS
"Atmospheric Lifetimes and Ozone Depletion Potentials of Methyl
Bromide (CH3Br) and Dibromomethane (CH2Br2)," A. Mellouki (NOAA, 325
Broadway, Boulder CO 80303), R.K. Talukdar et al., Geophys. Res. Lett.,
19(20), 2059-2062, Oct. 23, 1992.
Rate coefficients measured in the laboratory were used with a semi-empirical
model and a 2-D model to calculate steady-state depletion potentials and
lifetimes with much greater accuracy than before. Potentials calculated for
methyl bromide and dibromomethane respectively are 0.65 and 0.17.
"On the Age of Stratospheric Air and Ozone Depletion Potentials in
Polar Regions," W.H. Pollock (NCAR, POB 3000, Boulder CO 80307), L.E. Heidt
et al., J. Geophys. Res., 97(D12), 12,993-12,999, Aug. 20, 1992.
Estimates of the age of stratospheric air were combined with direct
measurements of HCFC-22, HCFC-142b, CH3Br, H-1301, H-1211 and H-2402 to estimate
their local depletion potentials. The HCFCs are much less efficiently
dissociated than CFC-11, lowering their ozone depletion potentials to only
30%-40% of their chlorine loading potentials. However, CH3Br and the Halons are
"Estimating Tropospheric Lifetimes and Ozone Depletion Potentials of
One- and Two-Carbon Hydrofluorocarbons and Hydrochlorofluorocarbons," J.S.
Nimitz (Ctr. Global Environ. Technol., Eng. Res. Inst., New Mexico Univ.,
Albuquerque NM 87131), S.R. Skaggs, Environ. Sci. Technol., 26(4),
739-744, Apr. 1992.
Made estimates for all 53 possible one- and two-carbon HFCs and
HCFCs, and examined relationships among C-H bond strength, activation energy for
removal of H by OH, tropospheric lifetime and depletion potentials. Developed
algorithms that are easy to apply and accurate enough for initially screening
alternative compounds based on environmental considerations.
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