Glacier Variability (1966--2006) in the Wind River Range, Wyoming, U.S.A PDF Download
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Author: Derrick R. Thompson
Publisher:
ISBN: 9781109555585
Category : Glaciers
Languages : en
Pages : 67
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Book Description
Spatial changes in glacier area for 44 glaciers in Wyoming's Wind River Range were estimated through a comparison of historic aerial photography from 1966 to 2006. The total surface area of the 44 glaciers was estimated to be 45.9 " 1.6 km2 in 1966 and 28.5 " 0.4 km2 in 2006, a decrease of 42%. Volumes of individual glaciers during the 41-year period were estimated utilizing the Bahr et al. (1997) volume-area scaling technique. The total ice volume lost was estimated to be 0.89 " 0.4 km3, which equates to 4.2% and 9.7% of warm season (July-September) streamflow for the Green River and Bull Lake Creek watersheds for the 41-year period. It was also determined that the Dinwoody Creek watershed contributed 12.4% to warm season (July-September) streamflow during the 1989 to 2006 period. Glacial surface area was also estimated utilizing resampled aerial photography to assess the relationship between area and measurement scale. Aerial photographs were resampled to resolutions of 10 meter, 15 meter, 22.5 meter and 30 meter to represent other satellite image resolutions used for evaluating glacier boundaries. The results show a linear decrease of total glacier area as resolution decreases. When comparing 1 meter resolution to the 30 meter resolution photographs for 1966 and 2006 photos, an average decrease total glacier area of 5% was calculated. It was concluded that high-resolution aerial photography remains the preferred and most accurate source for measuring glacier characteristics.
Author: Derrick R. Thompson
Publisher:
ISBN: 9781109555585
Category : Glaciers
Languages : en
Pages : 67
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Book Description
Spatial changes in glacier area for 44 glaciers in Wyoming's Wind River Range were estimated through a comparison of historic aerial photography from 1966 to 2006. The total surface area of the 44 glaciers was estimated to be 45.9 " 1.6 km2 in 1966 and 28.5 " 0.4 km2 in 2006, a decrease of 42%. Volumes of individual glaciers during the 41-year period were estimated utilizing the Bahr et al. (1997) volume-area scaling technique. The total ice volume lost was estimated to be 0.89 " 0.4 km3, which equates to 4.2% and 9.7% of warm season (July-September) streamflow for the Green River and Bull Lake Creek watersheds for the 41-year period. It was also determined that the Dinwoody Creek watershed contributed 12.4% to warm season (July-September) streamflow during the 1989 to 2006 period. Glacial surface area was also estimated utilizing resampled aerial photography to assess the relationship between area and measurement scale. Aerial photographs were resampled to resolutions of 10 meter, 15 meter, 22.5 meter and 30 meter to represent other satellite image resolutions used for evaluating glacier boundaries. The results show a linear decrease of total glacier area as resolution decreases. When comparing 1 meter resolution to the 30 meter resolution photographs for 1966 and 2006 photos, an average decrease total glacier area of 5% was calculated. It was concluded that high-resolution aerial photography remains the preferred and most accurate source for measuring glacier characteristics.
Author: Jeffrey Allen Marks
Publisher:
ISBN:
Category :
Languages : en
Pages : 47
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Book Description
The Wind River Range is a continuous mountain range approximately 160 km in length in west - central Wyoming. The Wind River Range is host to roughly 680 snow and ice bodies with 63 of these considered glaciers including seven of the ten largest glaciers in the American Rocky Mountains. The presence of glaciers results in meltwater contributions to streamflow during the late summer (July, August, and September -- JAS) when snowmelt is decreasing, temperatures are high, precipitation is low, and irrigation demand continues. Most studies indicate that the glaciers in the Wind River Range have been retreating since the 1850's, the approximate end of the Little Ice Age. Thus, the quantification of glacier meltwater (e.g., volume, mass) contributions to late - summer/early - fall streamflow is important given this resource is dwindling due to glacier recession. The current research expands upon previous research efforts and identified two glaciated watersheds, one on the east slope (Bull Lake Creek) and one on the west slope (Green River) of the Wind River Range in which unimpaired streamflow is available from 1966 to 2006. Glaciers were delineated within each watershed and area estimates (with error) were obtained for the years 1966, 1989 and 2006. Glacier volume (mass) loss (with error) was estimated using empirically based volume - area scaling relationships. For 1966 to 2006, glacier mass contributions to JAS streamflow on the east slope were approximately 8% while on the west slope were approximately 2%. The volume - area scaling glacier mass estimates compared favorably with measured (stereo - pairs remote sensed data) estimates of glacier mass change for three glaciers (Teton, Middle Teton, Teepe) in the nearby Teton Range and one glacier (Dinwoody) in the Wind River Range. While glacier mass contribution to JAS streamflow was estimated at 8% (east slope) and 2% (west slope) from 1966 to 2006, an increase was observed during the period of 1989 to 2006 (>11% - east slope and>3% - west slope). Historic climate data, including precipitation (snowpack) and temperature (JAS average) showed a decrease in snowpack and rapid increase in temperatures during the 1989 to 2006 period, which most likely explains this increase in glacier melt.
Author: Jake F. Edmunds
Publisher:
ISBN: 9781124102337
Category : Aerial photography in glaciology
Languages : en
Pages : 53
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Book Description
Glacial area and volume changes were quantified through the use of historical aerial photographs in Wyoming's Teton Range. Glacial area changes in the Teton Range were estimated for three glaciers using un-rectified aerial photography from 1967 to 2006. The total surface area of the three glaciers was 0.53 km2 in 1967 and 0.40 km2 in 2006, a decrease of 25% over the 39 year period. The smallest glacier, Teepe, experienced the most noticeable area loss of approximately 60% while the Teton Glacier, the largest, lost approximately 17%. Aerial photography from 1967 to 2002 was used to estimate glacier volume loss using stereoscopy techniques. Volume loss for the three glaciers was estimated to be 3.2 million cubic meters (MCM) over the 35 year period. An empirical relationship (power formula) was developed, relating volume loss to area loss for the Teton Range glaciers. The results of the volume change were compared to estimates using Bahr's et al. (1997) area to volume conversion equation. Temperature (1905-2006) and April 1st Snow water equivalent SWE (1981-2006) data were analyzed in an attempt to determine a driving factor for glacial area and volume loss. Neither temperature nor April 1st SWE data correlated to rates of area or volume losses. Stream flow data (1905-2006) was examined to determine the contribution of the glaciers in the Teton Range to the flow in the Snake River. The contribution of ice melt from the three glaciers to flow in the Snake River was found to be less than one third of a percent. The results from the Teton Range were compared to those of the Wind River Range (WRR) in an effort to better explain the future impact of glacier variability.
Author: Jameson E. Bell
Publisher:
ISBN: 9781109534863
Category : Glaciers
Languages : en
Pages : 52
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Author: Kyle S. Cheesbrough
Publisher: ProQuest
ISBN: 9780549356677
Category : Glaciers
Languages : en
Pages : 55
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Author: Richard A. Marston
Publisher:
ISBN:
Category : Glaciers
Languages : en
Pages : 123
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Author: Richard A. Marston
Publisher:
ISBN:
Category : Glaciers
Languages : en
Pages : 22
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Author: L. O. Pochop
Publisher:
ISBN:
Category : Glaciers
Languages : en
Pages : 7
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Author: Jeffrey A. Vanlooy
Publisher:
ISBN:
Category : Glaciers
Languages : en
Pages : 11
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Book Description
The Wind River Range in Wyoming, USA, contains the largest concentration of glacial mass in the Rocky Mountains of the contiguous USA. Despite this distinction, only a few field or remotely sensed studies providing glacier volume changes have been published. The current study focuses on Continental Glacier located on the northern end of the range and uses two field datasets (high-accuracy GPS surface elevation points and ice-penetrating radar transects of the glacier bed) to create a threedimensional model of glacier volume. Current surface elevations are compared with historical elevation data to calculate surface elevation change over time. An average thinning rate of 13.8±7.8m (0.30±0.17ma-1) between 1966 and 2012 was found. Surface elevation change rates varied across the glacier, ranging from +0.30 to -0.98ma-1. Taking into account variable melt rates across the glacier, along with a glacial volume of 72.1?106±10. 8?106m3, we estimate that Continental Glacier will be reduced in volume by 43% over the next 100 years and will disappear completely over the next 300-400 years, if current climatic conditions persist.
Author:
Publisher:
ISBN:
Category : Glaciers
Languages : en
Pages : 130
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