February 28, 2007
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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 7, NUMBER 10, OCTOBER 1994
PROFESSIONAL PUBLICATIONS... OF GENERAL INTEREST: CLIMATE CHANGE SCIENCE
"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.
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.
"Carbon Storage by Introduced Deep-Rooted Grasses in the
South American Savannas," M.J. Fisher (Centro Internacional
de Agricultura Tropical, Apartado Aéreo 6713, Cali, Columbia),
I.M. Rao et al., ibid., 371(6494), 236-238, Sep.
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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