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Iceberg is twice the size of Atlanta

Iceberg is twice the size of Atlanta

By Brad Lendon

 (CNN) -- A massive iceberg with an area almost twice the size of Atlanta is moving into the ocean off Antarctica and could threaten shipping during the Antarctic winter, scientists say.

The ice island, known as iceberg B31, covers 255 square miles and could be almost a third of a mile thick, scientists say in a report from NASA's Earth Observatory.

The iceberg calved from Antarctica's Pine Island Glacier last November, according to NASA. The crack that produced it was first spotted in 2011.

Since November, B31 has drifted out of Pine Island Bay and into the Amundsen Sea off the western side of the continent.

"The iceberg is now well out of Pine Island Bay and will soon join the more general flow in the Southern Ocean, which could be east or west in this region," iceberg researcher Grant Bigg from the University of Sheffield in England said in the NASA statement.

Once that happens, the researchers worry it will be difficult track the iceberg during the long weeks of darkness that comprise the Antarctic winter.

And don't expect it to melt. An iceberg of that size could hang around for a year or more, Robert Marsh, a scientist at the University of Southampton in England, said last year.


   
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