Region-wide glacier mass budgets and area changes for the Central Tien Shan between ~ 1975 and 1999 using Hexagon KH-9 imagery
Region-wide glacier mass budgets and area changes for the Central Tien Shan between ~ 1975 and 1999 using Hexagon KH-9 imagery
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DOI：
10.1016/j.gloplacha.2014.11.014
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发表时间：
2015-05
影响因子：
3.9
通讯作者：
T. Pieczonka;T. Bolch
中科院分区：
文献类型：
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作者：
T. Pieczonka;T. Bolch
天山中部冰川融水的补给主要是塔里木河，塔里木河是塔克拉玛干沙漠北方边缘绿洲的主要动脉。由于缺乏对冰川物质收支的长期测量，对冰川融水对总径流的贡献的正确评估受到阻碍。基于~ 1975 KH-9 Hexagon影像生成了中天山不同区域的数字地形模型（DTM），并与2000年2月获得的SRTM 3 DTM进行了比较。此外，1975-2008年期间的冰川面积变化已经通过多时相光学卫星图像测量。大地质量收支估计的冰川化面积为5000 km 2显示，增加的质量损失从东到西，从内到外的范围。最大的质量损失伴随着最明显的冰川退缩出现在Ak-Shirak冰川，其区域范围的质量平衡为-0.51 ± 0.36 m w.e. a-1，面积变化率为-0.27 ± 0.15% a-1，而Inylchek（0.20 ± 0.44 m w.e. a− 1）和Tomur地区（0.33 ± 0.30 m w.e. a− 1）尽管有部分碎片覆盖，但观察到了中等程度的质量损失。后者也揭示了整个中天山冰川收缩最小的地区。然而，0.35 ± 0.34 m w.e. a− 1的总冰川质量损失在全球平均范围内，而冰川面积收缩相对较低。平均而言，调查的冰川化面积约为6600 km 2，仅缩小了0.11 ± 0.15% a− 1。我们还可以识别几个浪涌型冰川。结果是一致的原位质量平衡测量Karabatkak冰川和以前公布的结果的Ak-Shirak范围证明适合解密图像的冰川变化调查。塔里木河最大支流阿克苏河1975-2000年冰川不平衡对径流的贡献约为20%。
The meltwater released by the glaciers in the Central Tien Shan feeds in particular the Tarim River which is the main artery for the oases at the northern margin of the Taklamakan desert. The correct assessment of the contribution of the glaciers' meltwater to the total runoff is hampered by the lack of long-term measurements of glacier mass budgets. Digital terrain models (DTMs) for the different regions in the Central Tien Shan were generated based on ~ 1975 KH-9 Hexagon imagery and compared to the SRTM3 DTM acquired in February 2000. Moreover, glacier area changes for the period ~ 1975–2008 have been measured by means of multi-temporal optical satellite imagery.The geodetic mass budget estimates for a glacierized area of 5000 km2revealed increasing mass loss east to west and from the inner to the outer ranges. Highest mass loss accompanied by the most pronounced glacier retreat was found for the Ak-Shirak massif with a region-wide mass balance of − 0.51 ± 0.36 m w.e. a− 1and a rate of area change of − 0.27 ± 0.15% a− 1, whilst moderate mass loss was observed for the Inylchek (0.20 ± 0.44 m w.e. a− 1) and Tomur area (0.33 ± 0.30 m w.e. a− 1) despite partly debris cover. These latter regions also revealed the lowest glacier shrinkage within the entire Central Tien Shan. The total glacier mass loss of 0.35 ± 0.34 m w.e. a− 1is, however, within the global average whilst the glacier area shrinkage is comparatively low. On average, the investigated glacierized area of ~ 6600 km2shrank by 0.11 ± 0.15% a− 1only. We could also identify several surge-type glaciers. The results are consistent with in-situ mass balance measurements for Karabatkak Glacier and previously published results of the Ak-Shirak range proving the suitability of declassified imagery for glacier change investigations. The contribution to the runoff of Aksu River, the largest tributary of the Tarim River, due to glacier imbalance has been determined at ~ 20% for the 1975–2000 period.