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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 #d94oct9

"Effect of Ozone Depletion on Atmospheric CH4 and CO Concentrations," S. Bekki (Ctr. Atmos. Sci., Cambridge Univ., Lensfield Rd., Cambridge CB2 1EW, UK), K.S. Law, J.A. Pyle, Nature, 371(6498), 595-597, Oct. 13, 1994.

The unprecedented, large depletion of stratospheric O3 in 1991 and 1992 may have contributed to the sharp decrease in the growth rates of CH4 and CO by exposing the troposphere to more UV radiation. Model simulations show that low values in stratospheric ozone can account for almost half the 1992 decrease in CH4 and CO growth rates.

Item #d94oct10

Two related items from Nature, 371(6497), Oct. 6, 1994:

"Arctic Chill for CO2 Uptake," C.B. Field (Dept. Plant Biol., Carnegie Inst., 290 Panama St., Stanford CA 94305), 472-473. Discusses the challenges to understanding responses of ecosystems to climate change, and the need for long-term, ecosystem-scale studies such as the following.

"Transient Nature of CO2 Fertilization in Arctic Tundra," W.C. Oechel (Global Change Res. Group, San Diego State Univ., San Diego CA 92182), S. Cowles et al., 500-503. Exposed in situ an intact native ecosystem (tussock tundra, Toolik Lake, Alaska) to elevated CO2 and normal or elevated temperatures for three years. The responses of native ecosystems to such conditions may not always be positive and are unlikely to be straightforward. CO2 fertilization effects must be considered in the context of genetic limitations, resource availability and other factors.

Item #d94oct11

"Carbon Storage by Introduced Deep-Rooted Grasses in the South American Savannas," M.J. Fisher (Centro Internacional de Agricultura Tropical, Apartado AĆ©reo 6713, Cali, Columbia), I.M. Rao et al., ibid., 371(6494), 236-238, Sep. 15, 1994.

In a pasture based on these plants, significant amounts of organic carbon were found deep in the soil. This could represent annual sequestration of 100-507 Mt of carbon, a substantial amount of the "missing sink."

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