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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 #d95jul122

"Seasonal Variations in the Atmospheric Distribution of a Reactive Chlorine Compound, Tetrachloroethene (CCl2=CCl2)," C.J.-L. Wang (Dept. Chem., Univ. Calif., Irvine CA 92717), D.R. Blake, F.S. Rowland, Geophys. Res. Lett., 22(9), 1097-1100, May 1, 1995.

Measurements in the Northern Hemisphere show maximum concentrations in late winter and minimum concentrations in late summer. The variation is strongly coupled to the atmospheric abundance of hydroxyl radical, the only important species responsible for CCl2=CCl2 removal.

Item #d95jul123

"Uptake of Haloacetyl and Carbonyl Halides by Water Surfaces," W.J. De Bruyn (Dept. Chem., Boston Coll., Chestnut Hill MA 02167), J.A. Shorter et al., Environ. Sci. Technol., 29(5), 1179-1185, May 1995.

A 30-day upper limit to the tropospheric lifetime of CCl3CClO and CCl2O implies that tropospheric removal of the halide degradation products is fast enough that they do not contribute to the ozone depletion potential of the parent HCFCs.

Item #d95jul124

"Atmospheric Distributions of HCFC 141b," S.M. Schauffler (NCAR, POB 3000, Boulder CO 80307), W.H. Pollock et al., Geophys. Res. Lett., 22(7), 819-822, Apr. 1, 1995.

Measurements of the distribution and rate of growth provide data to begin evaluating the atmospheric fate of this replacement for CFC 11 and CFC 113. Found a strong interhemispheric gradient and rapid growth in tropospheric mixing ratios during various periods in 1992-1993.

Item #d95jul125

"A Net Sink for Atmospheric CH3Br in the East Pacific Ocean," J.M. Lobert (CMDL, NOAA, 325 Broadway, Boulder CO 80303), J.H. Butler et al., Science, 267(5200), 1002-1005, Feb. 17, 1995.

Measurements indicate that about 8% of the observed interhemispheric difference in atmospheric CH3Br can be attributed to an uneven global distribution of oceanic sources and sinks.

Item #d95jul126

"Effects of Electron and Ion Reactions on Atmospheric Lifetimes of Fully Fluorinated Compounds," R.A. Morris (Phillips Lab., Hanscom AFB MA 01731), T.M. Miller et al., J. Geophys. Res., 100(D1), 1287-1294, Jan. 20, 1995.

Evaluates lifetimes for CF4, C2F6, c-C4F8, C6F14 and SF6. While the lifetimes of c-C4F8 and SF6 may be significantly shorter than previously estimated, these compounds remain extremely long-lived with significant global warming potentials.

Item #d95jul127

"On the Evaluation of Halocarbon Radiative Forcing and Global Warming Potentials," J.S. Daniel (CIRES, Univ. Colorado, Boulder CO 80309), S. Solomon, D.L. Albritton, J. Geophys. Res., 100(D1), 1271-1285, Jan. 20, 1995.

Unlike other greenhouse gases, halocarbons can have a cooling effect through their ability to destroy stratospheric ozone. This study calculates net global warming potentials for 14 significant halocarbons. In the next 20 years, halocarbon radiative forcing is not predicted to decrease as mixing ratios of strongly ozone-depleting gases decline, because of faster decreases in radiative cooling than in radiative warming. Continuing production of HFCs as substitutes for CFCs could result in sharply increasing halocarbon radiative heating in the latter part of the 20th century.

Item #d95jul128

"Early Trends in the Global Tropospheric Abundance of Hydrochlorofluorocarbon-141b and 142b," S.A. Montzka (CMDL, NOAA, 325 Broadway, Boulder CO 80303), R.C. Myers et al., Geophys. Res. Lett., 21(23), 2483-2486, Nov. 15, 1994.

Reports the first global time series of two HCFCs that are considered interim CFC replacements because they also contain chlorine. Results suggest that HCFCs are currently used extensively to replace CFCs in selected applications; measured tropospheric levels are significantly higher than expected based on available emission estimates and consumption predictions.

Specialized Papers

Item #d95jul129

"Infrared Band Intensities and Global Warming Potentials of CF4, C2F6, C3F8, C4F10, C5F12 and C6F14," C.M. Roehl (M. Planck Inst. Chem., Abteilung Luftchem., 55020 Mainz, Ger.), D. Boglu et al., Geophys. Res. Lett., 22(7), 815-818, Apr. 1, 1995.

Item #d95jul130

"Theoretical Performance of HCFCl123 as an Alternative to CFC11," S.A.M. Said (Mech. Eng. Dept., King Fahd Univ. Petroleum & Minerals, Dhahran, Saudi Arabia), Y.M. Suleiman, B. Ismail, Energy, 20(3), 205-208, Mar. 1995.

Item #d95jul131

"Rate Constant for the Reaction of OH Radical with HFC-365mfc (CF3CH2CF2CH3)," A. Mellouki (Lab. Combustion & Sys. R?actifs, Univ. Orl?ans, 45071 Orl?ans cedex 2, France), S. T?ton, G. Le Bras, Geophys. Res. Lett., 22(4), 389-392, Feb. 15, 1995.

Item #d95jul132

"Correlations Between Rate Parameters and Calculated Molecular Properties in the Reactions of the Hydroxyl Radical with Hydrofluorocarbons," C.J. Percival, G. Marston, R.P. Wayne (Phys. Chem. Lab., Univ. Oxford, S. Parks Rd., Oxford OX1 3QZ, UK), Atmos. Environ., 29(3), 305-311, Feb. 1995.

Item #d95jul133

"The Fate of Atmospheric Phosgene and the Stratospheric Chlorine Loadings of Its Parent Compounds: CCl4, C2Cl4, C2HCl3, CH3CCl3, and CHCl3," T.P. Kindler (Sch. Earth & Atmos. Sci., Georgia Inst. Technol., Atlanta GA 30332), W.L. Chameides et al., J. Geophys. Res., 100(D1), 1235-1251, Jan. 20, 1995.

Item #d95jul134

"Tropospheric Reaction Products and Mechanisms of the Hydrochlorofluorocarbons 141b, 142b, 225ca, and 225cb," E.C. Tuazon (Statewide Air Pollut. Res. Ctr., Univ. Calif., Riverside CA 92521), R. Atkinson, Environ. Sci. Technol., 28(13), 2306-2313, Dec. 1994.

Item #d95jul135

"Vertical Distribution of Methyl Bromide over Hyderabad, India," S. Lal (Phys. Res. Lab., Ahmedabad 380 009, India), R. Borchers et al., Tellus, 46B(5), 373-377, Nov. 1994.

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