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Global Climate Change DigestArchives of the
Global Climate Change Digest

A Guide to Information on Greenhouse Gases and Ozone Depletion
Published July 1988 through June 1999



Item #d91jan40

"Reactions of Hydrofluorocarbons and Hydrochlorofluorocarbons with the Hydroxyl Radical," D.L. Cooper (Dept. Chem., Univ. Liverpool, POB 147, Liverpool L69 3BX, UK), N.L. Allan, A. McCulloch, Atmos. Environ., 24A(9), 2417-2419, 1990. Reaction rates for H-atom abstraction are important in determining the atmospheric residence times of HCFCs and HFCs, regarded as potential substitutes for fully halogenated CFCs. Reaction rates are reported and a method is given for predicting unknown rates.

Item #d91jan41

"Laboratory Studies of Some Halogenated Ethanes and Ethers: Measurements of Rates of Reaction with OH and of Infrared Absorption Cross-Sections," A.C. Brown (Phys. Chem. Lab., Univ. Oxford., S. Parks Rd., Oxford OX1 3QZ, UK), C.E. Canosa-Mas et al., ibid., 2499-2511.

A discharge-flow, resonance-fluorescence technique was used in the temperature range 230-423 K to measure the reaction rates for potential CFC substitutes. Measurements are used to calculate ozone and global warming depletion potentials relative to CFCl3.

Item #d91jan42

"Volatile Organic Compounds in Solfataric Gases," V.A. Isidorov (Chem. Dept., Leningrad Univ., 198904, Leningrad, USSR), I.G. Zenkevich, B.V. Ioffe, J. Atmos. Chem., 10(3), 329-340, Apr. 1990.

Data obtained through gas chromatographic analysis of volcanic gas samples confirm the existence of a natural source of halocarbons that have a long lifetime in the troposphere. They play an important role in the greenhouse effect and in the catalytic cycle of destruction of stratospheric ozone.

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