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[greenyes] Climate Disruption - The Antarctic Ice Cap

Antarctic ice shelf collapse linked to global warming
The collapse of a huge ice shelf in Antarctica in 2002 has no precedent in
the past 11,000 years, according to a study to be published today that
points the finger at global warming.

Measuring some 3,250 sq km in area and 220m thick, the Larsen B iceshelf
broke away from the eastern Antarctic Peninsula in 2002, eventually
disintegrating into giant icebergs.
By chance, a US-led team of geologists had gathered a rich harvest of data
around the ice shelf just before the spectacular collapse, including six
cores that had been drilled into marine sediment.
The cores contain the remains of plankton and algae imbedded in layers of
minerals, and their radiocarbon and oxygen isotopes provide clues about ice
cover and climate change over the millennia.
The researchers, reporting in Nature, the British science weekly, say that
since the end of the last Ice Age, some 11,000 years ago, the ice shelf had
been intact but had slowly thinned, by several dozen metres.
Its coup de grace came from a recent but decades-long rise in air
temperature, they say.
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