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Science 7 November 1997:
Vol. 278. no. 5340, pp. 1104 - 1106
DOI: 10.1126/science.278.5340.1104
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Reports
Observed Hemispheric Asymmetry in Global Sea Ice Changes
D. J. Cavalieri,
*
P. Gloersen,
C. L. Parkinson,
J. C. Comiso,
H. J. Zwally
From November 1978 through December 1996, the areal extent of sea
ice decreased by 2.9 ± 0.4 percent per decade in the Arctic and
increased by 1.3 ± 0.2 percent per decade in the Antarctic. The
observed hemispheric asymmetry in these trends is consistent with a
modeled response to a carbon dioxide-induced climate warming. The
interannual variations, which are 2.3 percent of the annual mean in the
Arctic, with a predominant period of about 5 years, and 3.4 percent of
the annual mean in the Antarctic, with a predominant period of about 3 years, are uncorrelated.
Laboratory for Hydrospheric Processes, NASA Goddard Space Flight
Center, Code 971, Greenbelt, MD 20771, USA.
*
To whom correspondence should be addressed.
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