news center

金沙上网导航:The melting of Canada's glaciers is irreversible

金沙上网导航:The melting of Canada's glaciers is irreversible

作者:成祥绉  时间:2017-09-04 02:02:09  人气:

SEE Canada’s glaciers while you can – their melting is irreversible. By the end of the century, a fifth of the Canadian ice sheet – the world’s third largest – could be gone for good, raising average global sea level by 3.5 centimetres. If the whole sheet melts, it would raise sea level by 20 centimetres. This is a fraction of the 70- and 7-metre rises expected if Antarctica and Greenland respectively each shed all their ice. But it becomes significant when combined with the melting of other smaller ice fields, says David Vaughan of ice2sea, the EU programme supporting the work. Jan Lenaerts of Utrecht University in the Netherlands and colleagues based these projections on measurements of receding ice. They say melting is accelerating, from 31 gigatonnes in 2005 to 92 gigatonnes in 2008 (Geophysical Research Letters, doi.org/kqr). The ice is unlikely to return,