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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: METHYL BROMIDE

Item #d94feb76

"Atmospheric Methyl Bromide: Trends and Global Mass Balance," M.A.K. Khalil (Global Change Res. Ctr., Oregon Grad. Inst., POB 91,000, Beaverton OR 97006), R.A. Rasmussen, R. Gunawardena, J. Geophys. Res., 98(D2), 2887-2896, Feb. 20, 1993.

Presents concentration data, including a decadal time series, latitudinal distributions in air and ocean, and variation with altitude. Uses the data to construct a global mass balance to estimate total emissions and apportionment between natural and anthropogenic sources.

Item #d94feb77

"An Investigation of the Atmospheric Sources and Sinks of Methyl Bromide," H.B. Singh (NASA-Ames, Moffet Field CA 94035), M. Kanakidou, Geophys. Res. Lett., 20(2), 133-136, Jan. 22, 1993.

Estimates that sources are about 35% anthropogenic and 65% natural. Oceans are the most important natural source. Model calculations show significant vertical and seasonal variations in atmospheric concentrations.

Item #d94feb78

"Nucleophilic Substitution Rates and Solubilities for Methyl Halides in Seawater," S. Elliott (Inst. Geophys., Los Alamos Natl. Lab., Los Alamos NM 87545), F.S. Rowland, ibid., 20(11), 1043-1046, June 7, 1993.

Measured rate constants for attack on CH3Br by chloride ion and H2O. Results are consistent with classical aqueous-phase research, adjusted for ionic strength effects.

Item #d94feb79

"A Temperature Dependent Kinetic Study of the Reaction of the Hydroxyl Radical with CH3Br," Z. Zhang (Chem. Kinetics Div., Natl. Inst. Stand. & Technol., Gaithersburg MD 20899), R.D. Saini et al., Geophys. Res. Lett., 12(24), 2413-2416, Dec. 24, 1992.

Estimates the tropospheric lifetime at 277 K to be 2.2 years with respect to OH, and 2.1 years overall.