Distribution of debris thickness and its effect on ice melt at Hailuogou glacier, southeastern Tibetan Plateau, using in situ surveys and ASTER imagery
Distribution of debris thickness and its effect on ice melt at Hailuogou glacier, southeastern Tibetan Plateau, using in situ surveys and ASTER imagery
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利用现场调查和 ASTER 影像研究青藏高原东南部海螺沟冰川碎屑厚度分布及其对冰融化的影响
DOI：
10.3189/002214311798843331
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发表时间：
2011-12
影响因子：
3.4
通讯作者：
Liu Qiao
中科院分区：
文献类型：
--
作者：
Koji FUJITA;Liu Shiyin;Zhang Yong;Takayuki NUIMURA;Liu Qiao
摘要青藏高原冰川消融区普遍存在碎屑覆盖，其空间分布对冰川融化速率有很大影响。对青藏高原东南部贡嘎山海螺沟冰川碎屑厚度的高分辨率现场测量表明，碎屑分布明显不均匀。对横向和纵向剖面的分析表明，地面测量的碎片厚度与先进星载热发射和反射辐射计(ASTER)得出的碎片层热阻在整个烧蚀区域内具有很强的相关性。ASTER得到的跨冰川和沿冰川的热阻模式与碎屑厚度的空间模式很好地对应，这可能反映了碎屑覆盖范围和厚度的大范围变化。由考虑碎屑层热阻的表面能量平衡模型模拟的消融区冰融融速率变异性清楚地表明了碎屑及其空间连续性在改变融化速率的空间特征中的关键作用。由于碎屑厚度的不均匀分布，海螺沟冰川约67%的消融区经历了加速融化，而约19%的消融区经历了抑制消融，仅有14%的消融区的次冰屑融化速率等于裸冰融化速率。
Abstract Debris cover is widely present in glacier ablation areas of the Tibetan Plateau, and its spatial distribution greatly affects glacier melt rates. High-resolution in situ measurements of debris thickness on Hailuogou glacier, Mount Gongga, southeastern Tibetan Plateau, show pronounced inhomogeneous debris distribution. An analysis of transverse and longitudinal profiles indicates that the ground-surveyed debris thicknesses and Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER)-derived thermal resistances of debris layers correlate strongly over the entire ablation area. Across- and along-glacier patterns of ASTER-derived thermal resistance correspond well with spatial patterns of debris thickness, which may reflect large-scale variations in the extent and thickness of the debris cover. The ice melt rate variability over the ablation area simulated by a surface energy-balance model that considered thermal resistance of the debris layer indicates clearly the crucial role of debris and its spatial continuity in modifying the spatial characteristics of melt rates. Because of the inhomogeneous distribution of debris thickness, about 67% of the ablation area on Hailuogou glacier has undergone accelerated melting, whereas about 19% of the ablation area has experienced inhibited melting, and the sub-debris melt rate equals the bare-ice melt rate in only 14% of the ablation area.
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DOI：
10.1109/igarss.2002.1025770
发表时间：
2002-06
期刊：
IEEE International Geoscience and Remote Sensing Symposium
影响因子：
--
作者：
S. Taschner;R. Ranzi
通讯作者：
S. Taschner;R. Ranzi
DOI：
10.2307/1551118
发表时间：
1981-01
期刊：
Arctic and alpine research
影响因子：
--
作者：
R. Armstrong;W. Paterson
通讯作者：
R. Armstrong;W. Paterson
影响因子：
3.4
作者：
Yong Zhang;Shi-yin Liu;Yongjian Ding
通讯作者：
Yong Zhang;Shi-yin Liu;Yongjian Ding
影响因子：
1.5
作者：
M. Nakawo;B. Rana
通讯作者：
M. Nakawo;B. Rana
DOI：
--
发表时间：
1975
期刊：
--
影响因子：
--
作者：
M. McSaveney
通讯作者：
M. McSaveney