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 2, FEBRUARY 1993
influence on climate: two articles plus a related commentary
in the Nov. 26 Nature discuss evidence that most of the
recent warming trend is caused by greenhouse forcing, not
variations in solar irradiance. (See Prof. Pubs./Gen. Int. Sci.; New
Scientist, p. 18, Dec. 5.)
slacken: Research presented at last November's meeting of the
parties to the Montreal Protocol (GCCD, p. 13, Jan. 1993)
shows that the rates of increase of CFC-11 and CFC-12 have slowed
in response to international controls under the Protocol.
However, considerable ozone destruction will continue to occur
from past emissions, regardless of future emission declines. See Science,
pp. 28-29, Jan. 1. 1992
lifetimes: A study published in the Jan. 8 Science
finds that perfluorocarbons--potential CFC substitutes composed
only of carbon and fluorine--have long atmospheric lifetimes and
could contribute to greenhouse warming for thousands of years.
The U.S. EPA is considering perfluorocarbons as acceptable
alternatives to CFCs if nothing else is available. (See Intl.
Environ. Rptr., p. 15, Jan. 13 1993; Global Environ.
Change Rep., p. 5, Jan. 15. 1993)
experiment: Scientists from over 13 nations studied a planned
burning of biomass last September in South Africa, as part of the
Southern African Fire-Atmosphere Research Initiative (SAFARI).
(See Nature, pp. 776 and 812, Oct. 29 1992).
- 1992 Aspen Global Change Institute. "The Coupled
Ocean System and Global Change," G. Meehl, D.
Schimel, Eos, pp. 2, 14, Jan. 5; "Freshwater,
Land, and Biospheric Interactions: Changes and
Impacts," M. Meier, M. Falkenmark, W. Riebsame, Eos,
p. 556, Dec. 29.
- Meetings on Earth System History, E. Barron, Eos,
pp. 338-339, Aug. 11. Discusses sessions organized by the
U.S. National Science Foundation and associated reports,
aimed at organizing a larger research planning workshop
of interested Earth scientists.
Global Change Fellowships: For already enrolled doctoral
students; proposals due April 1. Contact Fellowship Prog., Code
SE-44, NASA, Washington DC 20546.
"Secrets from Tibet's Icy Peaks," Science, p.
181, Jan. 8. An American-Chinese expedition has obtained ice
cores from a Tibetan glacier that span up to 200,000 years of
seasonal deposits of snow and dust. The annual stratigraphy of
the core is much more pronounced than is found in ice at more
poleward locations such as Greenland.
"Atmospheric Research Plane Unveiled," Chem. Eng.
News, p. 8, Jan. 4. The unmanned plane, the first designed
specifically for high-altitude research, will collect data
related to stratospheric ozone and other problems up to an
altitude of 98,000 feet.
"Getting an Earful of Climate," Science, p.
1087, Nov. 13. A geologist and a paleontologist from the
University of Michigan are attempting to determine past
temperatures in the North American interior by analyzing lumps of
calcium carbonate (otoliths) found in the ears of most fish. They
are measuring the oxygen isotopes of daily layers of carbonate in
otoliths found in fossil deposits and among Indian artifacts.
"Southeast Asian Gases and Coasts," R.H. Moss, Ambio,
p. 491, Nov. Summarizes research plans submitted by the Southeast
Asia Regional Committee for the START program of the IGBP.
Activities will focus on estimates of greenhouse-gas fluxes,
especially in relation to changes in land use and cover, and will
assess the impacts of sea level increase on terrestrial and
marine resources in the coastal zone.
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Index of Abbreviations