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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 #d99may19

“A Model-Derived Global Climatology of UV Irradiation at the Earth’s Surface, A. A. Sabziparvar, K. P. Shine, and P. M. de F. Forster, Photochemistry and Photobiology, 69 (2), 193-202 (1999).

A multistream radiative transfer model was used to calculate the geographic distribution of the UV-A and UV-B dose rates at the surface of the Earth. It used a multiyear climatology that included the effects of ozone, clouds, surface pressure, surface albedo, temperature, and aerosols. The results indicated that the most important factor in determining the dose is the Sun’s position. Clouds reduce the dose from a few percent under clear-sky conditions to 45% where midlatitude depressions occur frequently.

Item #d99may20

“Present and Future Trends in the Atmospheric Burden of Ozone-Depleting Halogens,” S. A. Montzka et al., Nature, 398, 690-694 (1999).

An analysis of atmospheric concentrations of ozone-depleting halogen species showed a decline since 1994 across a large number of chemicals led by the decline of trichloroethane, a cleaning solvent. Its decline has now peaked. Any future declines in emissions of ozone-depleting compounds will have to come from limitations on emissions of other chemicals, notably Halon-1211 (CBrClF2), whose atmospheric concentration has remained constant and is retarding the overall decline of ozone-depleting halogens.

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