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 7, NUMBER 2, FEBRUARY 1994
- HALOCARBONS: OTHER SPECIFIC SPECIES
Environmental History and Probable Future of Fluorocarbon
11," M.A.K. Khalil (Oregon Grad. Inst., POB 91,000, Portland
OR 97291), J. Geophys. Res., 98(D12),
23,091-23,106, Dec. 20, 1993. Concentrations are not likely to
reach the peaks once predicted, and are likely to decline faster
Light and Accuracy of the Cross-Section Measurements of Weak
Absorptions: Gas and Liquid Phase UV Absorption Cross Sections of
CH3CFCl2," A. Fahr (Chem. Kinetics Div., Natl. Inst. Stand.
& Technol., Gaithersburg MD 20899), W. Braun, M.J. Kurylo, ibid., 98(D11),
20,467-20,472, Nov. 20, 1993.
Demonstrates that scattered light from the shorter wavelengths
can compromise the absorption cross-section measurement. Uses a
model to assess the effect and make corrections.
Production and Release to the Atmosphere of Chlorodifluoromethane
(HCFC 22)," P.M. Midgley, D.A. Fisher (Du Pont Co., Exper.
Sta., POB 80320, Wilmington DE 19880), Atmos. Environ., 27A(14),
2215-2223, Oct. 1993.
Presents production and use data for 1980-1991 and production
data for 1970-1979. Compares calculated atmospheric
concentrations and trends with measurements.
of Trifluoroacetic Acid from the Atmospheric Degradation of
Hydrofluorocarbon 134a: A Human Health Concern?" J.C. Ball
(Sci. Res. Lab.-3083, Ford Motor Co., Dearborn, MI 48121), T.J.
Wallington, Air & Waste, 43(9), 1260-1262, Sep.
The estimated maximum concentration of CF3COOH from the
breakdown of HFC-134a is 80 nM, well below concentrations used in
animal studies that have shown no acute adverse health effects.
Constant for the Reaction of OH with CH3CCl2F (HCFC-141b)
Determined by Relative Rate Measurements with CH4 and
CH3CCl3," K. Huder (Jet Propulsion Lab., 4800 Oak Grove Dr.,
Pasadena CA 91109), W.B. DeMore, Geophys. Res. Lett., 20(15),
1575-1577, Aug. 6, 1993.
Constants for the Reactions of OH with HFC-134a (CF3CH2F) and
HFC-134 (CHF2CHF2)," W.B. DeMore (Jet Propulsion Lab., 4800
Oak Grove Dr., Pasadena CA 91109), Geophys. Res. Lett., 20(13),
1359-1362, July 9, 1993.
Establishes more accurate rate constants; previously the
recommended constant for HFC-134a was too high and data for
HFC-134 was limited.
of Solar Radiation by O2: Implications for O3 and Lifetimes of
N2O, CFCl3, and CF2Cl2," K. Minschwaner (NCAR, POB 3000,
Boulder CO 80307), R.J. Salawitch, M.B. McElroy, J. Geophys.
Res., 98(D6), 10,543-10,561, June 20, 1993. (See GCCD,
Degradation Products of CH2FCF3 (HFC-134a)," E.C. Tuazon
(Statewide Air Pollut. Res. Ctr., Univ. Calif., Riverside CA
92521), R. Atkinson, J. Atmos. Chem., 16(4),
301-312, May 1993.
Investigated the relative importance of the two major reaction
pathways. Predicted that decomposition is dominant at Earth's
surface, and reaction with O2 is dominant at the tropopause.
Tropospheric Distribution and Calibration Scale of HCFC-22,"
S.A. Montzka (CMDL, NOAA, 325 Broadway, Boulder CO 80303), R.C.
Myers et al., Geophys. Res. Lett., 20(8), 703-706,
Apr. 23, 1993.
Laboratory measurements suggest a global tropospheric mean
about 28% lower than that determined from surface-based
measurements. Estimates a mean growth rate for HCFC-22 of 7.3
(±0.3)% yr-1 for 1987-1992.
Reaction Kinetics and Atmospheric Lifetimes of CF3CFHCF3 and
CF3CH2Br," D.D. Nelson Jr. (Aerodyne Res. Inc., Billerica MA
01821), M.S. Zahniser, C.E. Kolb, ibid., 20(2),
197-200, Feb. 5, 1993. Found atmospheric lifetimes for the
compounds of 42 and 4.1 years, respectively.
Chemistry of Hydrofluorocarbon 134a. Fate of the Alkoxy Radical
CF3O," J. Sehested, T.J. Wallington (Sci. Res. Lab.-3083,
Ford Motor Co., POB 2053, Dearborn MI 48121), Environ. Sci.
Technol., 27(1), 146-152, Jan. 1993.
Establishes the rate constant for the reaction of CF3O with
HFC-134a, and investigates the decomposition of the reaction
Chemistry of Hydrofluorocarbon 134a: Fate of the Alkoxy Radical
CF3CFHO," T.J. Wallington (Sci. Res. Lab.-3083, Ford Motor
Co., POB 2053, Dearborn MI 48121), M.D. Hurley et al., Environ.
Sci. Technol., 26(7), 1318-1324, July 1992.
Investigates decomposition and the reaction with O2 of the
radical produced by photooxidation of HFC-134a.
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