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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 #d92nov91

UV contrast: Measurements show that surprisingly less ultraviolet radiation reaches the Earth's surface in Germany than in New Zealand. The difference is attributed to both stratospheric ozone depletion over New Zealand and to the screening effect of elevated tropospheric ozone over Germany. (See Seckmeyer, Nature, p. 135, Sep. 10, 1992, in Prof. Pubs./Gen. Interest--Ozone Depletion, this GLOBAL CLIMATE CHANGE DIGEST issue--Nov. 1992; and Science News, pp. 180-181, Sep. 19.)

Item #d92nov92

New ice core results: The first major findings from ice coring conducted by a team from eight European nations, the Greenland Ice Core Project (GRIP), are reported by Johnsen et al. in Nature (p. 311, Sep. 24, 1992; see Prof. Pubs./General Int.--Sci., this GLOBAL CLIMATE CHANGE DIGEST issue--Nov. 1992), and further discussed by D. Peel on pp. 274-275 of that issue. The results confirm the existence of irregular, rapid warmings of up to 7 ° C during the last ice age, which could provide important cases for testing global climate models. Future results are expected to show, among other things, whether greenhouse gas concentrations have led or lagged temperature variations. Implications of the research are also discussed in New Scientist, p. 15, Sep. 26.

Item #d92nov93

Hydroxyl radical measured: The hydroxyl radical controls the lifetimes of many chemical species in the troposphere, including some greenhouse gases and ozone-depleting species. "Stalking the Elusive Hydroxyl Radical" by W.H. Brune (Science, pp. 1154-1156, May 22, 1992) discusses the implications of a paper on p. 1187 of that issue by Mount and Eisele (see Prof. Pub./Tropospheric OH), which reports successful measurements of OH that differ from model predictions.

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