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 4, NUMBER 7, JULY 1991
"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,
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.
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.
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.
"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
"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.
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