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A Delaware-sized portion of Antarctica’s forth-largest ice shelf calved off, sometime between July 10th and 12th, following the rapid propagation of a 127 kilometer (79 mile) long crack running through the sheet. The resulting iceberg is over 200 meters (656 feet) thick, and covers roughly 6,000 square kilometers (Delaware itself is only 5,130 square kilometers (1,982 square miles). This will likely place it as the third-largest known iceberg in modern history.
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A $17 million expedition aimed at studying the effects of climate change in Canada’s Hudson Bay has been postponed due to complications brought about by climate change itself. An unusually heavy southward flow of surface ice from the Arctic has blocked the safe passage of the Canadian Research Icebreaker CCGS Amundsen, on the first leg of her mission to ferry 40 scientists participating in the Hudson Bay System Study (BaySys).
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The massive crack running through Antarctica’s fourth-largest ice shelf dramatically accelerated its growth last month, extending over 11 miles in just six days. According to the UK-based Project Midas research group, the 110 kilometer (68 mile) long chasm extended an additional 17 km (11 miles) between May 25 and May 31.

The crack’s course has also suddenly turned seaward, with only 13 km (8 miles) remaining before the ice front calves off. Provided the ice front stays intact after calving, the resulting iceberg would account for more than ten percent of Larsen C’s area, a 5,000 square kilometer (1,150 sq mi) island of ice 350 meters (1,150 feet) thick, approximately the size of the state of Delaware. A berg that size would be one of the largest on record.
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