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Arctic Sea Ice Extent Reaches New Historic Minimum

Arctic Sea Ice Extent Reaches New Historic Minimum

Arctic Sea Ice Extent September 8, 2011 source: IUP, University of Bremen

Scientists at the University of Bremen confirmed today that on September 8, 2011 Arctic sea ice extent reached a new all-time low, superseding the previous low set in September 2007.

Arctic sea ice extent undergoes a pronounced yearly cycle, with about 15 million square kilometers in March and 5 million square kilometers in September. Since the beginning of satellite-based observations in 1972, Arctic summer ice has retreated by about 50 percent.The previous historic low was set with 4.267 million square kilometers in 2007. Scientists estimate this to be the lowest extent since the last climate optimum roughly 8,000 years ago.

According to the working group of Prof. Georg Heygster at the University of Bremen ice extent on September 8, 2011 reached a minimum of 4.24 million square kilometers, about 27,000 square kilometers or 0.6 percent below the previous record. The current ice extent is likely to decrease further as melting can be expected to continue until the second half of the month.

Furthermore, sea ice concentration along the edge of the ice shield has declined significantly, even in comparison to 2007. According to maps provided by the University of Bremen thinner and more porous ice appears to protrude further into the ice field than it did during the previous record year of 2007. These loose assemblies of ice floes, especially near the Chukchi sea, are the most vulnerable to further melting over the next 10-14 days.

Arctic Sea Ice Extent Reaches New Historic Minimum

Arctic Sea Ice Concentration September 2007 and 2011 source: IUP, University of Bremen

Interestingly the rate at which sea ice retreated during the month of August remained below the rate of 2007. One of the explanations for the new absolute minimum thus lies with above average melting early during the summer in May and July.

Arctic Sea Ice Extent Reaches New Historic Minimum

Sea Ice Decline 1979-2011 in July and August courtesy: NSIDC

The National Snow and Ice Data Center (NSIDC) in Boulder, Colorado has not yet released any information about the latest figures from the University of Bremen. The Center’s latest report was released on September 6, 2011, two days before the new record low occurred.



Malte Humpert

Malte Humpert graduated magna cum laude from Georgetown University in 2011 with a Master of Arts in European Studies. He completed his undergraduate studies in Political Science at California State University Northridge in 2007. During his graduate studies he focused on institutional regime change in the Arctic, energy and security issues in the High North, and the economic potential of the region's shipping routes. He is currently the executive director of The Arctic Institute , a research platform for circumpolar security issues founded in 2010. He speaks German, French, and Spanish.

Area of Focus
Arctic regime change, energy security, shipping routes