The Seasonal Snow Cover of Arctic Alaska PDF Download
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Author: Carl S. Benson
Publisher: Washington, D.C. : Arctic Institute of North America
ISBN:
Category : Snow surveys
Languages : en
Pages : 47
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Book Description
The snow cover of Arctic Alaska includes two distinct types which are separated by the Brooks Range. On the Arctic Slope the snow has a wind-swept, continuous surface which resembles that of the Greenland or Antarctic Ice Sheets. The snow of Interior Alaska, between the Brooks and Alaska Ranges, lies in heavily forested land with patches of smooth continuous snow cover occurring on lakes and swamps and on hilltops above timberline. It is possible to differentiate between Arctic and Pacific source areas for snow deposited on the Arctic Slope. The heavy isotopes of hydrogen and oxygen are more abundant in precipitation from the Pacific. The electrical conductance of melt waters derived from Pacific snowfall is also higher than that from Arctic storms. More investigations are needed, but present information suggests that Arctic sources make up nearly half of the precipitation on the Arctic Slope. This is an important factor in considerations on the origin and maintenance of the Pleistocene North American Ice Sheet. (Author).
Author: Carl S. Benson
Publisher: Washington, D.C. : Arctic Institute of North America
ISBN:
Category : Snow surveys
Languages : en
Pages : 47
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Book Description
The snow cover of Arctic Alaska includes two distinct types which are separated by the Brooks Range. On the Arctic Slope the snow has a wind-swept, continuous surface which resembles that of the Greenland or Antarctic Ice Sheets. The snow of Interior Alaska, between the Brooks and Alaska Ranges, lies in heavily forested land with patches of smooth continuous snow cover occurring on lakes and swamps and on hilltops above timberline. It is possible to differentiate between Arctic and Pacific source areas for snow deposited on the Arctic Slope. The heavy isotopes of hydrogen and oxygen are more abundant in precipitation from the Pacific. The electrical conductance of melt waters derived from Pacific snowfall is also higher than that from Arctic storms. More investigations are needed, but present information suggests that Arctic sources make up nearly half of the precipitation on the Arctic Slope. This is an important factor in considerations on the origin and maintenance of the Pleistocene North American Ice Sheet. (Author).
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
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Book Description
This project deals with the seasonal snow on Alaska's Arctic Slope. Although it is concentrated on snow of the R4D project area, it is important to relate the snow cover of this area with the rest of the Arctic Slope. The goals include determination of the amount of precipitation which comes as snow, the wind transport of this snow and its depositional pattern as influenced by drifting, the physical properties of the snow, the physical processes which operate in it, the proportions of it which go into evaporation, infiltration and runoff, and the biological role of the snow cover. The 1984--1985, 1985--1986 and 1986--1987 seasonal snow was measured to determine its total quantity, its physical structure and its distribution as a function of wind and topography. Observations of meteorological parameters and snowpack characteristics during winter and spring have yielded information on the seasonal evolution of the snow in quantitative terms. A method of determining melt rates over large regions was developed and is being refined, progress was made on a model describing energy flux sources which control snow melting. A strong control is exerted by air mass advection on a broad scale. We are continuing to devote attention to the sources of energy and energy transfer mechanisms which control snow melt. The 1986 snow melt was two weeks later than the 1987 and 1985 meltouts. The delay was caused by advection of cold air from the Arctic Ocean. When it did get underway melting was very rapid and the snow pack disappeared in only half the time taken in 1985.
Author: Michael A. Bilello
Publisher:
ISBN:
Category : Fort Greely (Alaska)
Languages : en
Pages : 44
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Book Description
Observations were made at 19 sites in and around the Fort Greely Military Reservation in Alaska during the winter of 1966-67 to obtain data on the depth and physical properties of the snow cover. Snowfall in 1966-67 totaled 245 cm, which was more than 2-1/2 times the seasonal normal. Maximum snow depths of 80 to 100 cm were observed in a major portion of the reservation. Measurements at nine sites showed that the snow density at Fort Greely was generally light; e.g., the average density in the forest did not exceed 0.24 g/cu cm. However, exceptions such as at Jarvis Creek, where the density averaged 0.33 g/cu cm, could be expected. On the average, less snow falls at Fort Greely than at other interior Alaskan locations; but the average density of the snow cover at all interior Alaska sites is quite light. Relationships between snow-cover properties and climate were tested using data collected at Fort Greely. The results substantiated the relationships between (1) snow hardness and snow density measurements and (2) average snow densities with average windspeed and air temperatures. Snow temperature measurements at Fort Greely showed that the snow in the forest was colder than at exposed sites, primarily because the average air temperature within the forest canopy was lower than that in the open area. (Author).
Author: Tingjun Zhang
Publisher:
ISBN:
Category : Frozen ground
Languages : en
Pages : 464
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Book Description
Author: Björn Holmgren
Publisher:
ISBN:
Category : Aerial photography in hydrology
Languages : en
Pages : 196
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Book Description
Author: Dennis Trabant
Publisher:
ISBN:
Category : Snow
Languages : en
Pages : 96
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
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Book Description
This project deals with the seasonal snow on Alaska's Arctic Slope. Although it is concentrated on snow of the R4D project area, it is important to relate the snow cover of this area with the rest of the Arctic Slope. The goals include determination of the amount of precipitation which comes as snow, the wind transport of this snow and its depositional pattern as influenced by drifting, the physical properties of the snow, the physical processes which operate in it, the proportions of it which go into evaporation, infiltration and runoff, and the biological role of the snow cover. The 1984--1985, 1985--1986 and 1986--1987 seasonal snow was measured to determine its total quantity, its physical structure and its distribution as a function of wind and topography. Observations of meteorological parameters and snowpack characteristics during winter and spring have yielded information on the seasonal evolution of the snow in quantitative terms. A method of determining melt rates over large regions was developed and is being refined, progress was made on a model describing energy flux sources which control snow melting. A strong control is exerted by air mass advection on a broad scale. We are continuing to devote attention to the sources of energy and energy transfer mechanisms which control snow melt. The 1986 snow melt was two weeks later than the 1987 and 1985 meltouts. The delay was caused by advection of cold air from the Arctic Ocean. When it did get underway melting was very rapid and the snow pack disappeared in only half the time taken in 1985.
Author: Glen Eddy Liston
Publisher:
ISBN:
Category : Snow
Languages : en
Pages : 246
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
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Book Description
This project deals with the seasonal snow on Alaska's Arctic Slope. Although it is concentrated on snow of the R40 project area, it is important to relate the snow cover of this area with the rest of the Arctic Slope. The goals include determination Of the amount of precipitation which comes as snow, the wind transport of this snow and its depositional pattern as influenced by drifting, the physical properties of the snow, the physical processes which operate in it, the proportions of it which go into evaporation, infiltration and runoff, and the biological role of the snow cover.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 18
Get Book Here
Book Description
This project deals with the seasonal snow on Alaska's Arctic Slope. Although it is concentrated on snow of the R4D project area, it is important to relate the snow cover of this area with the rest of the Arctic Slope. The goals include determination of the amount of precipitation which comes as snow, the wind transport of this snow and its depositional pattern as influenced by drifting, the physical properties of the snow, the physical processes which operate in it, the proportions of it which go into evaporation, infiltration and runoff, and the biological role of the snow cover.
