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Global Climate Change Digest

A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999


OZONE DEPLETION: Ozone Depleting Compounds

Item #d98mar70

"Green Plants: A Terrestrial Sink for Atmospheric CH3Br," P.M. Jeffers (Chem. Dept., SUNY Cortland, Cortland NY 13077), N.L. Wolfe, V. Nzengung,Geophys. Res. Lett., 25(1), 43-46, Jan. 1, 1998.

Methyl bromide is reactively removed from the air by the foliage of all nine herbaceous, 18 deciduous, and 12 coniferous plants tested. This sink could be significant for the global methyl bromide budget.

Item #d98mar71

"Evaluation of Source Gas Lifetimes from Stratospheric Observations," C.M. Volk (Inst. Meteor. & Geophysik, Univ. Frankfurt, 60323 Frankfurt am Main, Ger.; e-mail:, J.W. Elkins et al.,J. Geophys. Res., 102(D21), 25,543-25,564, Nov. 20, 1997.

Simultaneous in situ measurements of several long-lived trace species indicate shorter lifetimes than those calculated from a photochemical model, implying the recovery of the ozone layer following the phaseout of industrial halocarbons will occur faster than is currently predicted.

Item #d98mar72

"Radiative Forcing of Climate Change by CFC-11 and Possible CFC Replacements," N. Christidis (Dept. Meteor., Univ. Reading, Reading RG6 6BB, UK; e-mail:, M.D. Hurley et al.,J. Geophys. Res., 102(D16), 19,597-19,609, Aug. 27, 1997.

Calculations indicate a value of radiative forcing for CFC-11 that is 30% higher than the value adopted by the IPCC, and is believed to be accurate to within 10%.

Item #d98mar73

"Anthropogenic Sources of Halocarbons, Sulfur Hexafluoride, Carbon Monoxide, and Methane in the Southeastern United States," P.S. Bakwin (CMDL/NOAA, 325 Broadway, Boulder CO 80303; e-mail:, D.F. Hurst et al.,J. Geophys. Res., 102(D13), 15,915-15,925, July 20, 1997.

Used hourly observations to determine that sources of CFCs 11, 12 and 113 are much lower than expected from global emissions inventories. This finding that may indicate that the ratio of North American to global emissions of these compounds has dropped dramatically since the mid-1980s, or that emissions have decreased more rapidly than industry estimates, or both.

Item #d98mar74

"Radiative Forcing Calculations for CH3Cl and CH3Br," A.S. Grossman (Atmos. Sci., Livermore Natl. Lab., L-103, Livermore CA 94550; e-mail:, K.E. Grant et al.,J. Geophys. Res., 102(D12), 13,651-13,656, June 27, 1997.

Calculations indicate that methyl chloride and methyl bromide have direct global warming potentials similar to that of methane, but current emission rates are too low to contribute meaningfully to atmospheric greenhouse warming.

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