Glacier and Permafrost Signals of 20th-Century Warming

Wilfried Haeberli
1990 Annals of Glaciology  
Currently-available evidence of 20th-century warming from glaciers and permafrost is briefly reviewed. The signals are clear and strong: warming of polar firn and permafrost, and mass losses of glaciers at lower latitudes, were most striking towards the middle of the century. The easily observable length-reduction of mountain glaciers confirms the global character of the evolution. A probably intermittent reversal of the trend was observed in places after about 1950.
doi:10.3189/s026030550000834x fatcat:2szqfrdjijelpk65mgxbcqoyl4