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Science 18 February 2000:
Vol. 287. no. 5456, pp. 1248 - 1250
DOI: 10.1126/science.287.5456.1248
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Reports
Widespread Complex Flow in the Interior of the Antarctic Ice Sheet
Jonathan L. Bamber,
1*
David G. Vaughan,
2
Ian Joughin
3
It has been suggested that as much as 90% of the discharge from
the Antarctic Ice Sheet is drained through a small number of
fast-moving ice streams and outlet glaciers fed by relatively stable
and inactive catchment areas. Here, evidence obtained from balance
velocity estimates suggests that each major drainage basin is fed by
complex systems of tributaries that penetrate up to 1000 kilometers
from the grounding line into the interior of the ice sheet. This
finding has important consequences for the modeled or estimated dynamic
response time of past and present ice sheets to climate forcing.
1 Bristol Glaciology Centre, School of
Geographical Sciences, University of Bristol, University Road, Bristol,
BS8 1SS, UK.
2 British Antarctic Survey High Cross,
Madingley Road, Cambridge, CB3 OET, UK.
3 Jet
Propulsion Laboratory, California Institute of Technology, Mail Stop
300-235, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
*
To whom correspondence should be addressed. E-mail:
j.l.bamber{at}bristol.ac.uk
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