This year's minimum sea-ice extent in the Arctic was the fourth lowest since satellite observations began, NASA announced yesterday (Sept. 15).
The ice cap floating on the ocean in the Arctic shrinks and expands with the seasons, reaching its maximum extent in March and its minimum in September.
This summer, the Arctic sea ice retreated to 1.70 million square miles (4.41 million square kilometers), hitting its annual minimum on Sept. 11, according to a joint analysis by NASA and the National Snow and Ice Data
Center (NSIDC) in Boulder, Colorado. That's 699,000 square miles (1.81 million square km) less than the average minimum for all years between 1981 and 2010.
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