Monday, May 12, 2014

#Antarctica: Where's the ICE?



New Antarctic ice shelf threatened by warming




By Chris Wickham; Editing by Janet Lawrence






LONDON (Reuters) – Scientists are predicting the disappearance of another vast ice shelf in Antarctica by the end of the century that will accelerate rising sea levels.


Edge of an ice shelf close to the Halley Station, Antarctica. Formation of giant icebergs is a process typical to the floating ice shelves in Antarctica. A new study indicates that an abrupt increase of basal melting may cause a substantial thinning of the large Filchner-Ronne Ice Shelf in the Weddell Sea. Photo: Ralph Timmermann / Alfred Wegener Institute
The Filchner-Ronne Ice Shelf fringing the Weddell Sea on the eastern side of Antarctica has so far not seen ice loss from global warming and much of the observation of melting has focused on the western side of the continent around the Amundsen Sea. But new research from the Alfred Wegener Institute for Polar and Marine Research in Germany says the 450,000-sq-km ice shelf is under threat.

"According to our calculations, this protective barrier will disintegrate by the end of this century," said Dr Harmut Hellmer, lead author of the study, published in the journal Nature this week.

The huge ice shelves that float on the seas fringing Antarctica provide a buffer against warming waters eating away at the base of the much larger glaciers behind them that sit on the land.
"Ice shelves are like corks in the bottles for the ice streams behind them," said Hellmer. "They reduce the ice flow.

"If, however, the ice shelves melt from below, they become so thin that the dragging surfaces become smaller and the ice behind them starts to move."

Hellmer and his team predict the melting of the Filchner-Ronne shelf could add up to 4.4 mm per year to rising global sea levels.





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