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Recent advances in the determination of
the mass balance of polar ice sheets show that the Greenland Ice Sheet
is losing massby near-coastal thinning, and that the West Antarctic
Ice Sheet,with thickening in the west and thinning in the north,
is probablythinning overall. The mass imbalance of the East Antarctic
IceSheet is likely to be small, but even its sign cannot yet be
determined.Large sectors of ice in southeast Greenland, the Amundsen
SeaEmbayment of West Antarctica, and the Antarctic Peninsula arechanging quite rapidly as a result of processes not yet understood.
1 Jet Propulsion Laboratory, California
Institute of Technology, Mail Stop 300-235, Pasadena, CA 91109, USA.
2 EG&G Services, Wallops Flight Facility,
Building N-159, Wallops Island, VA 23337, USA. E-mail:
eric{at}adelie.jpl.nasa.gov, robert_thomas{at}hotmail.com
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