Floating Arctic Ice Shrinking at Record Rate
By ANDREW C. REVKIN
New York Times
The area of floating ice in the Arctic has shrunk more than in any summer since satellite tracking began in 1979, and it has reached that record point a month before the annual ice pullback typically peaks, experts said.
The cause is probably a mix of natural fluctuations, like unusually sunny conditions in June and July, and long-term warming from heat-trapping greenhouse gases and sooty particles accumulating in the air, according to several scientists.
William L. Chapman, who monitors the region at the University of Illinois Urbana-Champaign and posted a Web report on the ice retreat today, said that only an abrupt change in conditions could prevent far more melting before the 24-hour sun of the boreal summer sets in September.
“The melting rate during June and July this year was simply incredible,” Mr. Chapman said. “And then you’ve got this exposed black ocean soaking up sunlight and you wonder what, if anything, could cause it to reverse course.”
Mark Serreze, a sea-ice expert at the National Snow and Ice Data Center in Boulder, Colo., said his center’s estimates differed somewhat from those of the Illinois team, and by the ice center’s reckoning the retreat had not yet surpassed the satellite-era record set in 2005.
But it was close even by their calculations he said, adding that it is almost certain that by September, there will be more open water in the Arctic than has been seen for a very long time. Ice experts at NASA and the University of Washington echoed his assessment.
(Continued here.)
New York Times
The area of floating ice in the Arctic has shrunk more than in any summer since satellite tracking began in 1979, and it has reached that record point a month before the annual ice pullback typically peaks, experts said.
The cause is probably a mix of natural fluctuations, like unusually sunny conditions in June and July, and long-term warming from heat-trapping greenhouse gases and sooty particles accumulating in the air, according to several scientists.
William L. Chapman, who monitors the region at the University of Illinois Urbana-Champaign and posted a Web report on the ice retreat today, said that only an abrupt change in conditions could prevent far more melting before the 24-hour sun of the boreal summer sets in September.
“The melting rate during June and July this year was simply incredible,” Mr. Chapman said. “And then you’ve got this exposed black ocean soaking up sunlight and you wonder what, if anything, could cause it to reverse course.”
Mark Serreze, a sea-ice expert at the National Snow and Ice Data Center in Boulder, Colo., said his center’s estimates differed somewhat from those of the Illinois team, and by the ice center’s reckoning the retreat had not yet surpassed the satellite-era record set in 2005.
But it was close even by their calculations he said, adding that it is almost certain that by September, there will be more open water in the Arctic than has been seen for a very long time. Ice experts at NASA and the University of Washington echoed his assessment.
(Continued here.)
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