Sea ice in the Arctic is melting at a record pace this year, suggesting warming at the north pole is speeding up and a largely ice-free Arctic can be expected in summer months within 30 years.
The area of the Arctic Ocean at least 15 percent covered in ice is this week about 8.5 million square kilometers — lower than the previous record low set in 2007 — according to satellite monitoring by the US National Snow and Ice Data Center (NSIDC) in Boulder, Colorado. In addition, new data from the University of Washington Polar Science Center show that the thickness of Arctic ice this year is also the lowest on record.
In the past 10 days, the Arctic Ocean has been losing as much as 150,000km2 of sea a day, NSIDC director Mark Serreze said.
“The extent [of the ice cover] is going down, but it is also thinning. So a weather pattern that formerly would melt some ice, now gets rid of much more. There will be ups and downs, but we are on track to see an ice-free summer by 2030. It is an overall downward spiral,” he said.
Global warming has been melting Arctic sea ice for the past 30 years at a rate of about 3 percent per decade on average. However, the two new data sets suggest that, if current trends continue, a largely ice-free Arctic in summer months is likely within 30 years. That is up to 40 years earlier than was anticipated in the last Intergovernmental Panel on Climate Change assessment report.
Sea ice, which is at its maximum extent in March and its lowest in September each year, is widely considered to be one of the “canaries in the mine” for climate change, because the poles are heating up faster than anywhere else on Earth. According to NSIDC, air temperatures last month were between 1oC and 4oC warmer than average over most of the Arctic Ocean.
The findings support a recent study in the journal Science that suggested water flowing from the Atlantic into the Arctic Ocean is warmer today than at any time in the past 2,000 years and could be one of the explanations for the rapid sea ice melt now being observed.
Computer simulations performed by NASA suggest that the retreat of Arctic sea ice will not continue at a constant rate. Instead the simulations show a series of abrupt decreases, such as the one that occurred in 2007, when a “perfect storm” of weather conditions coincided and more ice was lost in one year than in the previous 28 years combined.
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