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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 5, NUMBER 6, JUNE 1992

NEWS...
RESEARCH NEWS

Item #d92jun108

GCM comparison: A comparison of 19 global climate models shows that their results vary mainly because of differences in the way moisture is represented. See Sci. News (p. 212, Apr. 4, 1992) or Randall et al., Prof. Pubs./Gen. Interest--Science, this GLOBAL CLIMATE CHANGE DIGEST issue--June 1992.

Item #d92jun109

CO₂ fertilization limited: Data from long-term experiments now in progress, funded by the Electric Power Research Institute, fail to show a CO₂ fertilization effect on tree growth. Instead, they are consistent with studies and theory indicating that the rate of biomass production is limited by the availability of nutrients. (From the EPRI newsletter Environment Update, p. 10, Apr. 1992)

Item #d92jun110

OH levels may be rising: A recent paper estimates that the hydroxyl radical (OH) may be increasing in the atmosphere by about one percent per year. As discussed in an article in Global Environ. Change Rep. (pp. 5-6, Mar. 27, 1992), one of the many roles of OH is to remove HCFCs, methyl chloroform, and methane. (See Prinn et al., J. Geophys. Res., Feb. 20, in Prof. Pubs./Trend Analysis, this GLOBAL CLIMATE CHANGE DIGEST issue--June 1992.)

Item #d92jun111

"Haze Clouds the Greenhouse," R. Monastersky, Sci. News, pp. 232-233, Apr. 11, 1992. A lengthy discussion of recent developments on the effect of sulfur particle haze on climate, focusing on the work of Robert Charlson and colleagues.