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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 #d94sep10

"Ozone Depletion: 20 Years After the Alarm," F.S. Rowland (Dept. Chemistry, Univ. California, Irvine, Calif.), M.J. Molina, Chem. Eng. News, pp. 8-13, Aug. 15, 1994.

The chemists who issued the first warning that chlorine from CFCs could destroy ozone in the stratosphere reflect extensively on the enormous changes that have occurred in the past two decades in atmospheric science, environmental policy and the CFC industry. The rapid development and acceptance of the Montreal Protocol offers considerable promise for the handling of future global environmental problems.

Item #d94sep11

"Chemical Depletion of Ozone in the Arctic Lower Stratosphere During Winter 1992-93," G.L. Manney (Jet Propulsion Lab., 4800 Oak Grove Dr., Pasadena CA 91109), L. Froidevaux et al., Nature, 370(6489), 429-433, Aug. 11, 1994.

Satellite observations supplemented with other analyses show that the roughly 20% decrease in Arctic lower stratospheric ozone in February and March 1993 is inconsistent with changes expected from transport alone, but is consistent with observed levels of clorine monoxide and associated depletion by chlorine chemistry. As chlorine levels continue to increase, ozone depletion in the region is likely to equal or exceed that of 1993 in the near future.

Item #d94sep12

"Minimal Effects of UV-B Radiation on Antarctic Diatoms Over the Past 20 Years," A. McMinn (Antarctic CRC, Univ. Tasmania, Box 252C, Hobart 7001, Tasmania, Australia), H. Heijnis, D. Hodgson, ibid., 370(6490), 547-549, Aug. 18, 1994.

Presents analyses of diatom assemblages from high-resolution stratigraphic sequences from anoxic basins in fjords of Vestfold Hills, Antarctica. Although the phytoplankton community there has already experienced about 20 years of exposure to increasing levels of UV-B radiation, little change could be detected in diatom composition. Results should apply to other Antarctic coastal regions, where thick ice cover and the timing of phytoplankton bloom offer protection from the effects of increased UV-B.

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