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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

PROFESSIONAL PUBLICATIONS...

• HALOCARBONS: GENERAL ANALYSES

Item #d94feb68

"Potential Chlorofluorocarbon Replacements: OH Reaction Rate Constants Between 250 and 315 K and Infrared Absorption Spectra," N.L. Garland (Chem. Div., Code 6111, Naval Res. Lab., Washington DC 20375), L.J. Medhurst, H.H. Nelson, J. Geophys. Res., 98(D12), 23,107-23,111, Dec. 20, 1993.

Estimated tropospheric lifetimes suggest that E 134 and FC 236fa may have significant global warming potential, while FC 236ea and FC 236cb do not.

Item #d94feb69

"Global Warming from Chlorofluorocarbons and Their Alternatives: Time Scales of Chemistry and Climate," M.K.W. Ko (Atmos. & Environ. Res. Inc., 840 Memorial Dr., Cambridge MA 01730), N.D. Sze et al., Atmos. Environ., 27A(4), 581-587, Mar. 1993. (See GCCD, May 1993.)

Item #d94feb70

"Infrared Cross Sections and Global Warming Potentials of 10 Alternative Hydrohalocarbons," C. Clerbaux (Lab. Chim. Phys. Moléculaire, CPI 160/09, Univ. Libre Bruxelles, 1050 Brussels, Belg.), R. Colin et al., J. Geophys. Res., 98(D6), 10,491-10,497, June 20, 1993.

Obtained absorption cross sections between 600 and 1500 cm-1, and used the integrated cross sections in a two-dimensional model to calculate the global warming potentials.

Item #d94feb71

"Potential CFC Replacements: Tropospheric Lifetimes of C3 Hydrofluorocarbons and Hydrofluoroethers," D.L. Cooper (Dept. Chem., Univ. Liverpool, POB 147, Liverpool L69 3BX, UK), T.P. Cunningham et al., Atmos. Environ., 27A(1), 117-119, Jan. 1993. Identifies factors that appear to favor short lifetimes for HFEs.

Item #d94feb72

"Tropospheric Transformation Products of a Series of Hydrofluorocarbons and Hydrochlorofluorocarbons," E.C. Tuazon (Statewide Air Pollut. Res. Ctr., Univ. Calif., Riverside CA 92521), R. Atkinson, J. Atmos. Chem., 17(2), 179-199, Aug. 1993. Quantified the products of the Cl-atom initiated reactions.

Item #d94feb73

"CFC Alternatives: A Fresh Look," K. Srinivasan (Dept. Mech. Eng., Indian Inst. Sci., Bangalore 560 012, India), Environ. Conserv., 19(4), 339-341, Winter 1992-1993.

Re-examines the CFC issue by looking at how molecular weight, size and dipole moment of R-134a and R-123 may affect the chemical equilibrium of ice particles in polar stratospheric clouds and influence photochemical reactions in them.

Item #d94feb74

"Laboratory Investigations of the Deposition of Oxidation Products of Hydrochlorofluorocarbons (HCFCs) and Hydrofluorocarbons (HFCs) to Aqueous Solutions," E.O. Edney (AREAL, U.S. EPA, Res. Triangle Pk. NC 27711), D.J. Driscoll, Water, Air, Soil Pollut., 66(1-2), 97-110, Jan. 1993.

Results were consistent with previous findings that deposition of the oxidation products to oceans and cloudwater was sufficiently fast that they are unlikely to be transported to the stratosphere.

Item #d94feb75

"Global Warming Potential Due to Chlorofluorocarbons and Their Substitutes," S. Guangyu (Inst. Atmos. Phys., Chinese Acad. Sci., Beijing 100029, China), Chinese J. Atmos. Sci., 16(3), 240-248, 1992. The global warming potentials of most of the proposed substitutes are significantly lower than those of the CFCs.