Grinnell Glacier

Infobox_Glacier | glacier_name = Grinnell Glacier

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caption = Grinnell Glacier in background (2005)
type = Mountain Glacier
location = Montana, U.S.
coordinates = coord|48|45|10|N|113|43|60|W|type:glacier
area = 217 acres (88 ha) circa year 1993
length =
thickness =
terminus = Proglacial lake
status = Retreating

Grinnell Glacier is located in the heart of Glacier National Park (U.S.) in the U.S. state of Montana. The glacier is named for George Bird Grinnell, an early American conservationist and explorer, who was also a strong advocate of ensuring the creation of Glacier National Park. The glacier is in the Lewis Range and rests on the north flank of Mount Gould at an altitude averaging 7,000 feet (2,133 m), in the Many Glacier region of the park. [* cite web| last = TopoQuest| url = http://www.topoquest.com/map.asp?z=12&n=5403098&e=300056&s=50&size=l&datum=nad83&layer=DRG25| title = Logan Pass Quad| format = Map| work = USGS Quad| publisher = USGS | accessdate = 2007-08-29]

The glacier has been one of the most photographed glaciers in the park and many of these photographs date back to the mid 19th century. When compared with images taken over subsequent years, the glacier has obviously retreated substantially. This is a pattern repeated throughout the park and worldwide, strong evidence of a global climate change correlating with Global warming. In 1850, at the end of what has been referred to as the Little Ice Age, Grinnell Glacier measured 2.88 km², including the area of The Salamander, an ice apron or shelf glacier that used to be attached to Grinnell, but is now separate. By 1993, Grinnell Glacier measured 0.88 km² and The Salamander measured 0.23 km².cite paper| author =Carl H. Key, Daniel B. Fagre,and Richard K. Menicke| title =Glacier Retreat in Glacier National Park, Montana| version =| publisher =U.S. Geological Survey| date =| url =http://www.nrmsc.usgs.gov/products/GCC/SattelliteAtlas_Key_02.pdf| format =pdf| accessdate = 2007-08-29] Glaciologists that have researched the glaciers in the park have predicted that all the glaciers in the park, including Grinnell, will disappear by the year 2030.cite web| last = | first = | authorlink = | coauthors = | year = 2007| url = http://www.nrmsc.usgs.gov/research/glaciers.htm| title = Monitoring and Assessing Glacier Changes and Their Associated Hydrologic and Ecologic Effects in Glacier National Park | format = | work = Glacier Monitoring Research| publisher = U.S. Geological Survey| accessdate = 2007-08-29]

Gem Glacier, the smallest remaining glacier in the park, is located on the Garden Wall above Grinnell. Repeat photography of the glacier taken between the years 1938 and 2005 (as shown below) demonstrate that the glacier has retreated significantly in that period. Interestingly, The Salamander and Gem Glacier have shown little change in area over the same period of time. The Salamander receives its name for its shape and its coloring, which comes from the serratia bacteria that grows on it.The glacier can be reached after a 6 mile (9.6 km) hike from a trailhead beginning at Swiftcurrent Lake. The trail has an altitude gain of just over 1,600 feet (487 m), with the majority of that in the second half of the hike. [cite web| url=http://www.bigskyfishing.com/National_parks/glacier/grinnell_glacier_trail.shtm| title = Hiking the Grinnell Glacier Trail| publisher = Big Sky Fishing| accessdate = 2007-08-29]

References

ee also

*Retreat of glaciers since 1850
*List of glaciers