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1993-04-08
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THE WEEK, Page 26HEALTH & SCIENCEGet Out the Lifeboats! Antarctica Is Melting
New evidence suggests the ice caps are more fragile than
assumed
If the Earth gets warmer, will the ice caps melt? That's a
matter of hot debate among scientists who worry about possible
climatic change. The Antarctic ice sheet alone is larger than
the continental U.S. and holds a mass of water that if melted
would raise world sea levels by about 60 m (200 ft.).
Coastal residents could take comfort in the prevailing
view that Antarctica hasn't thawed for 14 million years, but
that view is being challenged. A report in Nature suggests
large portions of the ice cap may have melted just 3 million
years ago.
The evidence centers on sea-plankton remains found in the
Transantarctic Mountains at altitudes where no sea should have
been. By measuring the age of nearby volcanic ash, a team led
by Peter Barrett at Victoria University of Wellington, New
Zealand, concluded that the whole area was probably flooded
during the mid-Pliocene epoch -- when temperatures were only a
few degrees warmer than today.