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Global Climate Change Digest
A Guide to Information on Greenhouse Gases and Ozone Depletion
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FROM VOLUME 4, NUMBER 7, JULY 1991

PROFESSIONAL PUBLICATIONS...
ATMOSPHERIC HALOCARBONS

Item #d91jul48

"Atmospheric Lifetimes of CHF2Br, a Proposed Substitute for Halons," T. Talukdar et al., A.R. Ravishankara (Aeronomy Lab., NOAA, R/E/AL2, 325 Broadway, Boulder CO 80303), Science, 252(5006), 693-695, May 3, 1991.

Determined the rate coefficient for the reaction of CHF2Br with OH, and its ultraviolet absorption cross section, and used these values in a one-dimensional model. The estimated lifetime of CHF2Br is seven years, shorter than those of CF3Br and CF2ClBr.

Item #d91jul49

J. Atmos. Chem., 12(3), Apr. 1991.

"Temperature-Dependence of Ultraviolet Absorption Cross Sections of Alternative Chlorofluoroethanes," D. Gillotay (Univ. Reims-UFR Sci., Lab. Spectros. atmos., Moulin de la Housse, BP 347, 51062 Reims Cedex, France), P.C. Simon, 269-285. The absorption cross sections of HCFC-123, HCFC-141b and HCFC-142b were measured for a 295-210 K temperature range. Proposes parametrical formulae to compute the absorption cross section for wavelengths and temperatures useful in atmospheric modeling.

"The Temperature Dependent, Infrared Absorption Cross Sections for the Chlorofluorocarbons: CFC-11, CFC-12, CFC-13, CFC-14, CFC-22, CFC-113, CFC-114 and CFC-115," A.H. McDaniel (NCAR, POB 3000, Boulder CO 80307), C.A. Cantrell et al., 211-227. Measured cross sections as a function of temperature from 203-295 K; makes recommendations for uses in atmospheric sensing and radiative energy transfer models.

Item #d91jul50

J. Geophys. Res., 96(D3), Mar. 20, 1991.

"Atmospheric Fate of Hydrofluoroethanes and Hydrofluorochloroethanes: 1. Rate Coefficients for Reactions with OH," T. Gierczak (Dept. Chem., Warsaw Univ., Zwirki i Wigury 101, 02-089 Warsaw, Poland), R. Talukdar et al., 5001-5011. Determined the rate coefficients for five alternatives to chlorofluoromethanes: HCFC-134a, HCFC-124, HCFC-123, HFC-152a, and HCFC-142b. The data are used in the following paper.

"Atmospheric Fate of Several Hydrofluoroethanes and Hydrochloroethanes: 2. UV Absorption Cross Sections and Atmospheric Lifetimes," J.J. Orlando (NCAR, POB 3000, Boulder CO 803O7), J.B. Burckholder et al., 5013-5023. Temperature-dependent cross sections were measured for five compounds and, combined with the kinetic data from the previous paper, were used to calculate atmospheric lifetimes using a one-dimensional atmospheric model.

"Atmospheric Fate of CF3Br, CF2Br2, CF2ClBr and CF2BrCF2Br," J.B. Burkholder (NOAA, R/E/AL2, 325 Broadway, Boulder CO 80303), R.R. Wilson et al., 5025-5043. Measurements of the temperature-dependent UV absorption cross sections of these haloalkanes, combined with a one-dimensional model, yield atmospheric lifetimes of 65, 3.2, 16 and <<20 years, respectively.

Item #d91jul51

"Tropospheric OH and the Lifetimes of Hydrochlorofluorocarbons," M. Prather (NASA-Goddard, 2880 Broadway, New York NY 10025), C.M. Spivakovsky, ibid., 95(D11), 18,723-18,729, Oct. 20, 1990. Lifetimes for the HCFCs are predicted in two ways: integrating their loss with a global model, and scaling to another compound with a better-known lifetime. Both approaches yield similar results.

Item #d91jul52

"Background Concentrations of Low-Molecular Chlorinated Hydrocarbons in the Antarctic Atmosphere and Snow Water," O.E. Tulupov (Taifun Sci. Indus. Assoc.), A.I. Kochetkov et al., Soviet Meteor. Hydrol., No. 6, 54-58, 1989 (publ. 1990). Eng. trans. of Meteor. i Gidrol., No. 6, 68-72, 1989. Gas chromatographic measurements indicate September maxima in concentrations of CHCl3, C2HCl3 and C2Cl4 in the surface Antarctic air of several times the global level, while CCl4 is approximately constant. The maxima are attributed to synoptic processes.