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 8, NUMBER 5, MAY 1995
OF GENERAL INTEREST: GLOBAL WARMING POTENTIALS
Evaluation of Halocarbon Radiative Forcing and Global Warming Potentials,"
J.S. Daniel (CIRES, Univ. Colorado, Boulder CO 80309), S. Solomon, D.L.
Albritton, J. Geophys. Res., 100(D1), 1271-1285, Jan. 20, 1995.
Unlike other greenhouse gases, halocarbons can have a cooling effect through
their ability to destroy stratospheric ozone. This study calculates net global
warming potentials for 14 significant halocarbons. In the next 20 years,
halocarbon radiative forcing is not predicted to decrease as mixing ratios of
strongly ozone-depleting gases decline, because of faster decreases in radiative
cooling than in radiative warming. Continuing production of HFCs as substitutes
for CFCs could result in sharply increasing halocarbon radiative heating in the
latter part of the 20th century.
Timescales for Anthropogenic CO2 in the Atmosphere," B.C.
O'Neill (Dept. Earth Sys. Sci., New York Univ., New York NY 10003), S.R. Gaffin
et al., Tellus, 46B(5), 378-389, Nov. 1994.
A number of timescales are being used in both scientific and policy contexts
to describe the behavior of greenhouse gases, but precise definitions are not
being used, leading to confusion over how to calculate, compare and interpret
these numbers. This paper analyzes the situation theoretically, particularly the
case of departure from steady state as in the atmosphere. Discusses results in
light of global warming policy issues, since any comparisons of lifetimes of
different greenhouse gases must use a consistent definition.
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