Mendenhall Glacier
| Mendenhall Glacier | |
|---|---|
| Sitaantaagu | |
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Mendenhall Glacier and frozen Mendenhall Lake
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| Type | Mountain glacier |
| Location | Coast Range, Juneau, Alaska, U.S. |
| Coordinates | 58°29′45″N 134°31′56″W / 58.49583°N 134.53222°WCoordinates: 58°29′45″N 134°31′56″W / 58.49583°N 134.53222°W |
| Terminus | Proglacial lake |
| Status | Retreating |
Mendenhall Glacier (also Sitaantaagu) is a glacier about 13.6 miles long located in Mendenhall Valley, about 12 miles (19 km) from downtown Juneau in the southeast area of the U.S. state of Alaska. The glacier and surrounding landscape is protected as part of the 5,815-acre Mendenhall Glacier Recreation Area, a federally designated unit of the Tongass National Forest.
The Juneau Icefield Research Program has monitored the outlet glaciers of the Juneau Icefield since 1942, including Mendenhall Glacier. The glacier has also retreated 1.75 miles (2.82 km) since 1929, when Mendenhall Lake was created, and over 2.5 miles (4.0 km) since 1500. The end of the glacier currently has a negative glacier mass balance and will continue to retreat in the foreseeable future.
Given that average yearly temperatures are currently increasing, and the outlook is for this trend to continue, it is actually possible that the glacier might experience a period of stabilization or slight advance during its retreating march. This is because increasing amounts of warm, moist air will be carried up to the head of the icefield, where colder ambient temperatures will cause it to precipitate as snow. The increased amount of snow will feed the icefield, possibly enough to offset the continually increasing melting experienced at the glacier's terminus. However, this interesting phenomenon will fade away if temperatures continue to climb, since the head of the glacier will no longer have cold enough ambient temperatures to cause snow to precipitate.
It was originally known as Sitaantaago ("the Glacier Behind the Town") or Aak'wtaaksit ("the Glacier Behind the Little Lake"), also latinized as Aakwtaaksit, by the Tlingit. The glacier was named Auke (Auk) Glacier by naturalist John Muir for the Tlingit Auk Kwaan (or Aak'w Kwaan) band in 1888. In 1891 it was renamed in honor of Thomas Corwin Mendenhall. It extends from the Juneau Icefield, its source, to Mendenhall Lake.
The glacier has recently come to the forefront of the international debate on global warming. The US Forest Service, which manages the Mendenhall Glacier, says "because glaciers are a product of climate, they respond to climate change." The Mendenhall glacier has been in retreat since the end of the Little Ice Age in the 1700s. In a joint article for the Juneau Empire Geologist Cathy Connor and Geophysicist Roman Motyka, both professors of the University of Alaska said "climatic warming coupled with ice loss through iceberg calving are the reasons the Mendenhall Glacier is retreating and shrinking." It is expected the glacier face will soon pull out of the lake.
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Wikipedia