Not So Great Lakes

A rapidly warming lake is the key to understanding the change, says Jay Austin, a limnologist at the University of Minnesota Duluth's Large Lakes Observatory. Earlier this year he reported that Superior's surface waters had warmed by about 2.5 °C since 1979 - far more than average air temperatures in the region during the same period (Geophysical Research Letters, vol 34, p L06604).

Global warming is shrinking the Great Lakes - earth - 30 May 2007 - New Scientist Environment

Lake Superior, the largest body of fresh water in the world by surface area, is experiencing its lowest water levels since the record set in 1926. The lake is down by 34 centimetres from a year ago, and more than half a metre below its long-term mean. At least part of the drop can be attributed to a multi-year drought that has been particularly severe since 2006. More troubling, however, is evidence that global warming is driving a long-term shrinkage of this massive natural reservoir.

Tags: global warming, dropping water level, Great Lakes