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 6, NUMBER 5, MAY 1993
EARTH SYSTEM SCIENCE
Section: "Evolution of Atmospheres," Science,
Feb. 12. Contains survey articles on validating models with
paleoclimatic data, determining past CO2 levels from
sedimentary rock, and controversy over the NASA Earth Observing
"Ecologists Put Some Life into Models of a Changing
World," Y. Baskin, Science, pp. 1694-1696, Mar. 19,
"Fire Beneath the Ice," R. Monastersky, Science News,
104-107, Feb. 13, 1993.
Two geophysicists have published evidence (Nature, Feb.
11, 1993) that there is volcanic activity beneath the West
Antarctic ice sheet. This finding suggests that the future
stability of the ice sheet will depend less on current and future
climate than on past climate and geological conditions. Should
the ice sheet collapse, sea levels would rise regardless of
efforts to limit global warming.
Indicators of Global Warming," D. Denniston, World Watch,
9, 34-35, Jan.-Feb. 1993 (Worldwatch Inst., 1776 Mass. Ave. NW,
Washington DC 20036).
Describes observations by several scientists around the world
which generally show a melting trend in glaciers during this
century. Most take this result as evidence of global warming.
Trends in high-altitude, tropical glaciers may have special
"Chasing the Rogue Icebergs," D. Vaughan, New
Scientist, 24-27, Jan. 9, 1993.
Scientists are using the motion of three huge icebergs that
broke off an antarctic ice shelf in 1986 to study ocean
circulation and evaluate computer models. Models appear to be
correct in showing sea temperature and circulation, rather than
air temperature, as the main controls on the melting of major ice
shelves. A confident estimate of any change in antarctic ice
content is many years away.
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