Polythermal glacier

A thermally complex glacier with both warm and cold ice (q.v.). Typically, warm ice occurs where the ice is thickest as a result of geothermal heating, whilst the snout and margins of the glacier are frozen to the bed.

Trapridge Glacier, Icefield Ranges, Yukon, Canada, one of many polythermal glaciers that are prone to surging. Photo M. J. Hambrey, 2006.