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Monday, 12 September 2011

Arctic may be ice-free within 30 years

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% covered in ice is this week about 8.5m sq kilometres – lower than the previous record low set in 2007 – according to satellite monitoring by the US National Snow and Ice Data Centre (NSIDC) in Boulder, Colorado. In addition, new data from the University of Washington Polar Science Centre, shows 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 150,000 square kilometres of sea a day, said Mark Serreze, director of the NSIDC.
"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."
Global warming has been melting Arctic sea ice for the past 30 years at a rate of about 3% per decade on average. But 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 (IPCC) 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 for June 2011 were between 1 and 4C warmer than average over most of the Arctic Ocean.

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