The extent of the sea ice covering the Arctic Ocean has shrunk to a record low, according to scientists from NASA and the NASA-supported National Snow and Ice Data Center (NSIDC) in Boulder, Colorado.
The amount is the smallest size ever observed in the three decades since consistent satellite observations of the polar cap began.
The extent of Arctic sea ice on 26th August, as measured by the Special Sensor Microwave/Imager on the U.S. Defense Meteorological Satellite Program spacecraft and analyzed by NASA and NSIDC scientists, was 1.58 million square miles (4.10 million square kilometers), or 27,000 square miles (70,000 square kilometers) below the previous record low in September 2007 of 1.61 million square miles (4.17 million square kilometers).
The sea ice cap naturally grows during the cold Arctic winters and shrinks when temperatures climb in the spring and summer. NASA said that over the last three decades, satellites have observed a 13 percent decline per decade in the minimum summertime extent of the sea ice. The thickness of the sea ice cover also continues to decline.
"The persistent loss of perennial ice cover -- ice that survives the melt season -- led to this year's record summertime retreat," said Joey Comiso, senior research scientist at NASA's Goddard Space Flight Center. "Unlike 2007, temperatures were not unusually warm in the Arctic this summer."
The new record was reached before the end of the melt season in the Arctic, which usually takes place in mid- to late-September. Scientists expect to see an even larger loss of sea ice in the coming weeks.
"In 2007, it was actually much warmer," Comiso said. "We are losing the thick component of the ice cover. And if you lose the thick component of the ice cover, the ice in the summer becomes very vulnerable."
"By itself it's just a number, and occasionally records are going to get set," NSIDC research scientist Walt Meier said about the new record. "But in the context of what's happened in the last several years and throughout the satellite record, it's an indication that the Arctic sea ice cover is fundamentally changing."
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