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The White Chuck Glacier (near Glacier Peak) is a particularly dramatic example. The glacier area shrank from 3.1 km 2 (1.2 sq mi) in 1958 to 0.9 km 2 (0.35 sq mi) by 2002. Between 1850 and 1950, the Boulder Glacier on the southeast flank of Mount Baker retreated 8,700 feet (2,700 m). William Long of the United States Forest Service observed the ...
If a glacier's terminus moves forward faster than it melts, the net result is advance. Glacier retreat occurs when more material ablates from the terminus than is replenished by flow into that region. Glaciologists consider that trends in mass balance for glaciers are more fundamental than the advance or retreat of the termini of individual ...
However, in the case of San Rafael Glacier, Chile, a switch from retreat (1945–1990) to advance (1990–1997) was noted. [17] Current examples of this retreat are Columbia Glacier and Guyot Glacier. The most famous recent example of this is the large retreat of Glacier Bay and Icy Bay glaciers in Alaska that occurred rapidly via this process ...
Near the end of the last glacial period, roughly 10,000 years ago, glaciers began to retreat. [2] A retreating glacier often left behind large deposits of ice in hollows between drumlins or hills . As the ice age ended, these melted to create lakes.
A shrinking glacier thins faster near the terminus than near the head, which explains why glaciers retreat up-valley and the glacier head stays in place [3] The speed of erosion or accumulation is partly dependent on a shape factor which is the ratio of the change in thickness at the glacier head to the change in the thickness at the terminus. [4]
A similar way of tracking glacier change is comparing photographs of the glacier's position at different times. [2] The form of a glacier terminus is determined by many factors. If the glacier is retreating, it is usually mildly sloping in form because a melting glacier tends to assume this shape.
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