Great Nunatak is a elevation summit located west of Valdez in the

Chugach Mountains The Chugach Mountains of southern Alaska are the northernmost of the several mountain ranges that make up the Pacific Coast Ranges of the western edge of North America. The range is about long and wide, and extends from the Knik and Turnag ...

of the

U.S. state In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its so ...

Alaska Alaska ( ) is a non-contiguous U.S. state on the northwest extremity of North America. Part of the Western United States region, it is one of the two non-contiguous U.S. states, alongside Hawaii. Alaska is also considered to be the north ...

. This remote mountain is situated near the terminus of the Columbia Glacier, southeast of

Columbia Peak Columbia Peak is a mountain peak in the Henry M. Jackson Wilderness in the U.S. state of Washington. Columbia Peak rises to . Together with Monte Cristo Peak and Kyes Peak it forms a basin that contains Columbia Glacier and Blanca Lake. C ...

, on land managed by

Chugach National Forest The Chugach National Forest is a United States National Forest in south central Alaska. Covering portions of Prince William Sound, the Kenai Peninsula and the Copper River (Alaska), Copper River Delta, it was formed in 1907 from part of a larger ...

. This 2.2-mile long feature has a secondary summit, elevation 3,412 ft. Great Nunatak traces its name to

Grove Karl Gilbert Grove Karl Gilbert (May 6, 1843 – May 1, 1918), known by the abbreviated name G. K. Gilbert in academic literature, was an American geologist. Biography Gilbert was born in Rochester, New York, and graduated from the University of Rochester. ...

, a geologist with the

United States Geological Survey The United States Geological Survey (USGS), founded as the Geological Survey, is an agency of the U.S. Department of the Interior whose work spans the disciplines of biology, geography, geology, and hydrology. The agency was founded on Mar ...

who was part of the 1899 Harriman Alaska expedition that explored this area. He believed it to be the largest

nunatak A nunatak (from Inuit language, Inuit ) is the summit or ridge of a mountain that protrudes from an ice field or glacier that otherwise covers most of the mountain or ridge. They often form natural pyramidal peaks. Isolated nunataks are also cal ...

in Alaska when he casually referred to it as ''"the great nunatak"'' in a 1902 publication. The mountain's toponym was officially adopted in 1975 by the U.S. Board on Geographic Names. While the name remains, its status as a nunatak is obsolete because glacier lobes that once barely touched, now no longer completely encircle this landform as the Columbia Glacier retreats, and tidewater of Columbia Bay replaces the ice on the north and west aspects of the mountain.Pfeffer, W. Tad "''The Opening of a New Landscape: Columbia Glacier at Mid-Retreat''", 2007,

Climate

Based on the

Köppen climate classification The Köppen climate classification divides Earth climates into five main climate groups, with each group being divided based on patterns of seasonal precipitation and temperature. The five main groups are ''A'' (tropical), ''B'' (arid), ''C'' (te ...

, Great Nunatak is located in a

subarctic climate The subarctic climate (also called subpolar climate, or boreal climate) is a continental climate with long, cold (often very cold) winters, and short, warm to cool summers. It is found on large landmasses, often away from the moderating effects of ...

zone with long, cold, snowy winters, and mild summers. Weather systems coming off the

Gulf of Alaska The Gulf of Alaska ( Tlingit: ''Yéil T'ooch’'') is an arm of the Pacific Ocean defined by the curve of the southern coast of Alaska, stretching from the Alaska Peninsula and Kodiak Island in the west to the Alexander Archipelago in the ...

are forced upwards by the Chugach Mountains (

orographic lift Orographic lift occurs when an air mass is forced from a low elevation to a higher elevation as it moves over rising terrain. As the air mass gains altitude it quickly cools down adiabatically, which can raise the relative humidity to 100% and cr ...

), causing heavy precipitation in the form of rainfall and snowfall. Winter temperatures can drop below 0 °F with wind chill factors below −10 °F. This climate supports the Columbia Glacier near this mountain. The months May through June offer the most favorable weather for climbing or viewing.

Gallery

File:Great Nunatak north aspect.jpg, North aspect in 2006 File:Columbia Bay (Alaska) by Sentinel-2.jpg, Satellite view in 2018 showing tidewater on the north and west sides of Great Nunatak (in bullseye) File:Columbia Glacier, Valley Glacier, August 25, 1969 (GLACIERS 1047).jpg, Great Nunatak in 1969 Columbia Glacier and Great Nunatak.jpg, Great Nunatak in lower half of frame surrounded by Columbia Glacier in 1966 File:Columbia Peak bullseye.jpg, Great Nunatak in lower right corner, 1993. (

centered) File:Icebergs and Great Nunatak.jpg, South aspect

References

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External links

Forecast
Mountains of Alaska Landforms of Chugach Census Area, Alaska One-thousanders of the United States

Climate

Gallery

See also

References

External links