Sciences in Cold and Arid Regions ›› 2020, Vol. 12 ›› Issue (6): 477–490.doi: 10.3724/SP.J.1226.2020.00477

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  • 收稿日期:2020-09-01 接受日期:2020-12-15 出版日期:2020-12-31 发布日期:2021-01-14

Thickness estimation of the Longbasaba Glacier: methods and application

GuangLi He1,JunFeng Wei1(),Xin Wang1,2   

  1. 1.School of Resource Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411100, China
    2.State Key Laboratory of Cryospheric Science, Northwest Institute of Ecology and Environmental Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China
  • Received:2020-09-01 Accepted:2020-12-15 Online:2020-12-31 Published:2021-01-14
  • Contact: JunFeng Wei E-mail:weijunfeng@hnust.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(41701061)

Abstract:

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 km3/a. In the investigation period, the area and volume of Longbasaba Lake expanded at rates of 0.12±0.01 km2/a and 0.0132±0.0018 km3/a, respectively. This proglacial lake could potentially extend up to 5,000 m from the lake dam.

Key words: Longbasaba Glacier, ice thickness distribution, ice volume change, glacial lake retention role, glacial lake expansion

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SourceDatePixel size (m)Utilization
Landsat ETM+December 26, 200030 mGlacier boundary
Landsat TMDecember 30, 201030 mGlacier boundary
Landsat OLIDecember 28, 201530 mGlacier boundary
Topographic map198030 mGlacier boundary, glacier surface elevation
SRTM200030 mGlacier surface elevation
ALOS201030 mGlacier surface elevation
TanDEM-X201530 mGlacier surface elevation

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YearArea (km2)Ice volume (km3)
198030.84±2.161.69±0.26
200030.39±2.071.54±0.23
201029.87±1.971.46±0.22
201529.69±1.711.41±0.21

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Parameter changeSensitivityParameter valueUnit
?f=+10%-9.1%0.8No unit
?m=+10%-3.3%5.5No unit
?n=+10%-40.7%2.2No unit
?A=+10%-2.4%2.4×10-151/(kPa3?s)
?C=+10%-4.7%0.53No unit
?fdebris=+10%+2.7%0.5No unit
?db?/dz0=+10%+2.7%5.5×10-31/a

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YearArea (km2)Storage volume (km3)Storage change (km3)
19800.38±0.030.0211±0.0008-
20000.89±0.060.0451±0.00090.0241±0.0033
20101.22±0.090.0612±0.00340.0161±0.0022
20151.45±0.110.0721±0.00410.0109±0.0015
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