Despite a growth spurt during quite a cold winter in the far north, Arctic sea ice has fallen to its second-lowest extent in 42 years of satellite observations, the National Snow and Ice Data Center reported.
“The year 2020 will stand as an exclamation point on the downward trend in Arctic sea ice extent,” said Mark Serreze, the center’s director.
“I thought the sea ice would do well this summer because it had such a favorable winter,” said Judah Cohen, scientist and polar weather specialist with Atmospheric and Environmental Research. In winter sea ice had reached its highest extent since 2013.
The polar vortex swirled persistently up that way, confining the cold air and keeping it from spilling into parts of the nation.
But then came extreme summer warmth. “That June heat wave over Siberia moved into the central Arctic in July and just was a very efficient ice melter,” said Cohen. He said the melting also might have received a boost from a strong storm at the end of July.
The center, and the University of Colorado Boulder, said that the sea ice evidently had reached its minimum annual extent, 1.44 million square miles, on Sept. 15. The record minimum of 1.31 million square miles was set in 2012.
This year’s Arctic sea ice cover shrank to the second lowest extent since modern record-keeping began in the late 1970s, at 1.44 million square miles (3.74 million square kilometers). https://t.co/DttbIMg749
— NASA Climate (@NASAClimate) September 21, 2020
Meanwhile, at the other end of the world where winter ends on Tuesday, the Antarctic is experiencing one of its top 10 sea-ice extents, the center said.
Map comparing the extent of summer #Arctic sea ice this year with the average between the years 1980 to 2010.
— AFP news agency (@AFP) September 22, 2020
Arctic sea ice melts in summer and reforms in winter, but satellite imagery taken regularly since 1979 shows how the cycle has been shrinking https://t.co/A2CcfRYoyn pic.twitter.com/tZysGIzpgM
