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Most Alaskan Glaciers Retreating, Thinning, Or Stagnating

Date:
October 6, 2008
Source:
United States Geological Survey
Summary:
Most glaciers in every mountain range and island group in Alaska are experiencing significant retreat, thinning or stagnation, especially glaciers at lower elevations, according to U.S. Geological Survey research.

Top: This August 1941 photograph is of Muir Glacier in Glacier Bay National Monument, Alaska. It shows the lower reaches of Muir Glacier, then a large, tidewater calving valley glacier and its tributary, Riggs Glacier. For nearly two centuries before 1941, Muir Glacier had been retreating. Middle: This August 1950 photo documents the significant changes that occurred during the 9 years between photographs A and B. Muir Glacier has retreated more than 2 miles, exposing Muir Inlet, and thinned 340 feet or more. However, it still is connected with tributary Riggs Glacier. Bottom: This August 2004 photo further documents the significant changes that have occurred during the 63 years between photographs A and C, and during the 54 years between photographs B and C. Muir Glacier has retreated out of the field of view and is now nearly 5 miles to the northwest. Riggs Glacier has retreated as much as 2000 ft and thinned by more than 800 feet.
Credit: Photos courtesy of the National Snow and Ice Data Center and Glacier Bay National Park and Preserve Archive, and Bruce Molnia/USGS

Most glaciers in every mountain range and island group in Alaska are experiencing significant retreat, thinning or stagnation, especially glaciers at lower elevations, according to a new book published by the U.S. Geological Survey. In places, these changes began as early as the middle of the 18th century.

Although more than 99 percent of Alaska's large glaciers are retreating, a handful, surprisingly, are advancing.

The Glaciers of Alaska, authored by USGS research geologist Bruce Molnia, represents a comprehensive overview of the state of the glaciers of Alaska at the end of the 20th century and beginning of the 21st century. Richard Williams Jr., an emeritus senior research glaciologist with the USGS, said the 550-page volume will serve as a major reference work for glaciologists studying glaciers in Alaska in the years and decades to come.

The report uses a combination of satellite images, vertical aerial photographs, oblique aerial photographs, and maps, supported by the scientific literature, to document the distribution and behavior of glaciers throughout Alaska.

The author concludes that, because of the vast areas encompassed by the glacierized regions of Alaska, satellite remote sensing provides the only feasible means of monitoring changes in glacier area and in position of termini -- the end of a glacier -- in response to short- and long-term changes in the marine and continental climates of Alaska.

Alaskan glaciers are found in 11 mountain ranges, one large island, one island chain, and one archipelago. Details about the recent behavior of many of Alaska's glaciers are contained in this richly illustrated book, with multiple photographs and satellite images, as well as hundreds of aerial photographs by Molnia, taken during his more than four decades of work in Alaska.

Three other USGS glaciologists authored two sidebar sections of the book: Columbia and Hubbard Tidewater Glaciers, by Robert M. Krimmel; and The 1986 and 2002 Temporary Closures of Russell Fiord by the Hubbard Glacier, by Bruce F. Molnia, Dennis C. Trabant, Rod S. March, and Robert M. Krimmel. A third section, Geospatial Inventory and Analysis of Glaciers: a Case Study for the Eastern Alaska Range, was authored by William F. Manley, Institute of Arctic and Alpine Research (INSTAAR), University of Colorado.


Story Source:

The above story is based on materials provided by United States Geological Survey. Note: Materials may be edited for content and length.


Cite This Page:

United States Geological Survey. "Most Alaskan Glaciers Retreating, Thinning, Or Stagnating." ScienceDaily. ScienceDaily, 6 October 2008. <www.sciencedaily.com/releases/2008/10/081006130550.htm>.
United States Geological Survey. (2008, October 6). Most Alaskan Glaciers Retreating, Thinning, Or Stagnating. ScienceDaily. Retrieved July 31, 2014 from www.sciencedaily.com/releases/2008/10/081006130550.htm
United States Geological Survey. "Most Alaskan Glaciers Retreating, Thinning, Or Stagnating." ScienceDaily. www.sciencedaily.com/releases/2008/10/081006130550.htm (accessed July 31, 2014).

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