This article, based on the field work took place on the zone of Tuomuer （托木尔） Peak, western Tian Shan （天山 ） during the period May 2008 to September 2009, obtained the spatial distribution of debris layer on t...This article, based on the field work took place on the zone of Tuomuer （托木尔） Peak, western Tian Shan （天山 ） during the period May 2008 to September 2009, obtained the spatial distribution of debris layer on the reference glaciers （Glacier No. 72, Glacier No. 74, Tuomuer Glacier） by detailed measurements of debris thickness and ablation rates on glacier and further by Spot-5 （5 m, 2005） high-resolution satellitic image applying remote sensing and geographic information systems approach to research the spatial distribution of debris layer on the zone of Tuomuer Peak. Specifically, the results indicate a sharp in ablation with debris cover thickness increasing from 0-4 cm followed by a decrease in ablation with debris thickness increasing beyond 4 cm for the glaciers No. 72 and No. 74. Spatial distributions of debris layer on the three reference glaciers have the same characteristics, the overall distribution from the vertical, the maximum thickness of debris in the glacier terminal, and the thickness of debris is constantly thinning since the end of the glacier increases with altitude. For the overall distribution from the horizontal, the regular pattern of debris thickness from both sides to the middle is diminishing. The debris on the zone of Tuomuer Peak mostly covered the glacier tongue and is mainly distributed below the altitude of 4 000 m; the area of debris covered approximate accounted for 14.9% on the entire glacier area in this region. Spatial distribution of debris layer on the zone of Tuomuer Peak is mainly affected by the elevation of the glacier terminal, followed by the slopes orientation, the sizes, and so on.展开更多
Chongce Ice Cap is located at the north-west Tibetan Plateau, 81°E and 35°N, with an altitude of 6530m on the top. The ice temperatures of six boreholes and the nearby snow pits were measured from 5950 to 63...Chongce Ice Cap is located at the north-west Tibetan Plateau, 81°E and 35°N, with an altitude of 6530m on the top. The ice temperatures of six boreholes and the nearby snow pits were measured from 5950 to 6366 m a. s. 1. along main flow-line in August, 1987. The lowest glacier temperature measured so far in China was found in the depth of 7—8 m展开更多
A total of 71,177 glaciers exist on the Qinghai-Tibet Plateau,according to the Randolph Glacier Inventory(RGI 6.0).Despite their large number,glacier ice thickness data are relatively scarce.This study utilizes digita...A total of 71,177 glaciers exist on the Qinghai-Tibet Plateau,according to the Randolph Glacier Inventory(RGI 6.0).Despite their large number,glacier ice thickness data are relatively scarce.This study utilizes digital elevation model data and ground-penetrating radar thickness measurements to estimate the distribution and variation of ice thickness of the Longbasaba Glacier using Glacier bed Topography(GlabTop),a full-width expansion model,and the Huss and Farinotti(HF)model.Results show that the average absolute deviations of GlabTop,the full-width expansion model,and the HF model are 9.8,15.5,and 10.9 m,respectively,indicating that GlabTop performs the best in simulating glacier thickness distribution.During 1980−2015,the Longbasaba Glacier thinned by an average of 7.9±1.3 m or 0.23±0.04 m/a,and its ice volume shrunk by 0.28±0.04 km3 with an average reduction rate of 0.0081±0.0001 km^3/a.In the investigation period,the area and volume of Longbasaba Lake expanded at rates of 0.12±0.01 km^2/a and 0.0132±0.0018 km3/a,respectively.This proglacial lake could potentially extend up to 5,000 m from the lake dam.展开更多
基金supported by the Knowledge Innovation Project of the Chinese Academy of Sciences (No. KZCX2-EW-311)the National Basic Research Program of China (No. 2010CB951003)+1 种基金the National Natural Science Foundation of China (Nos. 1141001040, J0930003/J0109)the SKLCS Founding (No. SKLCS-ZZ-2010-04)
文摘This article, based on the field work took place on the zone of Tuomuer （托木尔） Peak, western Tian Shan （天山 ） during the period May 2008 to September 2009, obtained the spatial distribution of debris layer on the reference glaciers （Glacier No. 72, Glacier No. 74, Tuomuer Glacier） by detailed measurements of debris thickness and ablation rates on glacier and further by Spot-5 （5 m, 2005） high-resolution satellitic image applying remote sensing and geographic information systems approach to research the spatial distribution of debris layer on the zone of Tuomuer Peak. Specifically, the results indicate a sharp in ablation with debris cover thickness increasing from 0-4 cm followed by a decrease in ablation with debris thickness increasing beyond 4 cm for the glaciers No. 72 and No. 74. Spatial distributions of debris layer on the three reference glaciers have the same characteristics, the overall distribution from the vertical, the maximum thickness of debris in the glacier terminal, and the thickness of debris is constantly thinning since the end of the glacier increases with altitude. For the overall distribution from the horizontal, the regular pattern of debris thickness from both sides to the middle is diminishing. The debris on the zone of Tuomuer Peak mostly covered the glacier tongue and is mainly distributed below the altitude of 4 000 m; the area of debris covered approximate accounted for 14.9% on the entire glacier area in this region. Spatial distribution of debris layer on the zone of Tuomuer Peak is mainly affected by the elevation of the glacier terminal, followed by the slopes orientation, the sizes, and so on.
文摘Chongce Ice Cap is located at the north-west Tibetan Plateau, 81°E and 35°N, with an altitude of 6530m on the top. The ice temperatures of six boreholes and the nearby snow pits were measured from 5950 to 6366 m a. s. 1. along main flow-line in August, 1987. The lowest glacier temperature measured so far in China was found in the depth of 7—8 m
基金The work was funded by the National Natural Science Foundation of China(No.41701061,No.41761144075,No.41771075,and No.41271091).
文摘A total of 71,177 glaciers exist on the Qinghai-Tibet Plateau,according to the Randolph Glacier Inventory(RGI 6.0).Despite their large number,glacier ice thickness data are relatively scarce.This study utilizes digital elevation model data and ground-penetrating radar thickness measurements to estimate the distribution and variation of ice thickness of the Longbasaba Glacier using Glacier bed Topography(GlabTop),a full-width expansion model,and the Huss and Farinotti(HF)model.Results show that the average absolute deviations of GlabTop,the full-width expansion model,and the HF model are 9.8,15.5,and 10.9 m,respectively,indicating that GlabTop performs the best in simulating glacier thickness distribution.During 1980−2015,the Longbasaba Glacier thinned by an average of 7.9±1.3 m or 0.23±0.04 m/a,and its ice volume shrunk by 0.28±0.04 km3 with an average reduction rate of 0.0081±0.0001 km^3/a.In the investigation period,the area and volume of Longbasaba Lake expanded at rates of 0.12±0.01 km^2/a and 0.0132±0.0018 km3/a,respectively.This proglacial lake could potentially extend up to 5,000 m from the lake dam.
