Arctic perennial sea ice - which normally survives the summer melt season and remains year-round - shrank abruptly by 14 per cent between 2004 and 2005.
According to researchers, the loss of perennial ice in the east Arctic Ocean neared 50 per cent during that time as some of the ice moved from the east Arctic to the west.
The overall decrease in winter Arctic perennial sea ice totals 280,000 square miles - an area the size of Texas....
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