Mendenhall Glacier is a glacier approximately 12 miles (19 km) long located in Mendenhall Valley, about 12 miles (19 km) from downtown Juneau. The glacier and surrounding landscape is protected as the 5,815-acre Mendenhall Glacier Recreation Area, a federally designated unit of the Tongass National Forest. Originally known as Sitaantaagu ("the Glacier Behind the Town") or Aak'wtaaksit ("the Glacier Behind the Little Lake") by the Tlingits, 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 and ultimately the Mendenhall River.
The Juneau Icefield Research Program has monitored the outlet glaciers of the Juneau Icefield since 1942, including Mendenhall Glacier. The glacier has also receded 1.75 miles (2.82 km) since 1958, 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.
Most of the images in the slide show below were taken from a vantage point on Douglas Island. Yes, this is the view that we, publishers Stacy and Dale Smith, have from our home there. It does give us a great opportunity to see the changing look of the glacier that mother nature provides. Our house is approximately 8 linear miles from the glacier. The Gastineau channel is the body of water that separates Douglas Island and the mainland where the glacier sits. Juneau waters have tidal swings that can be over 20 feet. That is why in some images there is water and an identical image taken from the same vantage point, there is none. When there is water, tide is high and when there is little or none, tide is low.
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