
That is the second lowest level since the centre began tracking the ice mass by satellite more than 30 years ago, with the lowest level recorded in 2007. The NSIDC cautioned that the measurement was based on preliminary results and that changing winds could push the ice flows closer together, resulting in a smaller figure when final numbers are released in early October.
“The last five years (2007 to 2011) have been the five lowest extents in the continuous satellite record, which extends back to 1979,” the NSIDC said. “While the record low year of 2007 was marked by a combination of weather conditions that favoured ice loss... this year has shown more typical weather patterns but continued warmth over the Arctic,” it said.
Using a different set of data, German researchers said last week that the area covered by Arctic Sea ice had reached its lowest point since the start of satellite observations in 1972, calling it a “new historic minimum.” Arctic ice cover plays a critical role in regulating Earth's climate by reflecting sunlight and keeping the polar region cool....
Satellite image of cloud streets in the Bering Sea. St. Matthew Island is visible in the upper portion, its mountains casting shadows to the southwest. From NASA
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