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Global Climate Change Digest
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Published July 1988 through June 1999

FROM VOLUME 7, NUMBER 2, FEBRUARY 1994

PROFESSIONAL PUBLICATIONS...

• HALOCARBONS: OTHER SPECIFIC SPECIES

Item #d94feb80

"The 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 than predicted.

Item #d94feb81

"Scattered 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.

Item #d94feb82

"The 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.

Item #d94feb83

"Formation 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. 1993.

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.

Item #d94feb84

"Rate 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.

Item #d94feb85

"Rate 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.

Item #d94feb86

"Absorption 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, July-Aug. 1993.)

Item #d94feb87

"Tropospheric 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.

Item #d94feb88

"Global 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.

Item #d94feb89

"OH 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.

Item #d94feb90

"Atmospheric 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 product, CF3OH.

Item #d94feb91

"Atmospheric 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.