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Different patterns of changes in glacier mass balance and glacier runoff over the Tarim Basin, Central Asia

地表径流 冰川 冰川物质平衡 降水 水文学(农业) 堆积带 地质学 雪线 气候变化 冰期 构造盆地 自然地理学 气候学 环境科学 地貌学 冰层 地理 海洋学 冰流 气象学 生态学 岩土工程 海冰 生物 积雪
作者
Min Xu,P. Wang,Hao Wu,Shichang Kang
出处
期刊:Hydrological Processes [Wiley]
卷期号:37 (10) 被引量:3
标识
DOI:10.1002/hyp.14997
摘要

Abstract The climate change impacted glacio‐hydrological regime and thus the availability of water resources in arid region of Central Asia. The effects of climate change in the magnitude or seasonality of regional glacier runoff were still poorly understood in Central Asia. In this study, the glacier runoff, components of glacier runoff, equilibrium line altitude ( ELA ) and Glacier Mass Balance ( GMB ) during 1959–2017 are evaluated by elevation‐dependent Degree‐Day glacier melt model in eight sub‐basins of Tarim Basin over Central Asia. The impacts of climate change on glacier and hydrology are assessed. The results suggested that climatic regime shifted to more warm‐wet pattern on glacier zone after 1990 in study area. The ablation and accumulation of glaciers showed different patterns in eight sub‐basins. All sub‐basins showed a glacier mass deficit and GMB displayed a marked decreasing trend, but also exhibiting discrepancy. The mean ELA and rising rate of ELA were higher in the southern region. The glacier runoff increased significantly after 1990 in Tarim Basin, with obviously temporal and spatial variations in sub‐basins. The mean annual volume of glacier runoff was 175.8 × 10 8 m 3 . The ice melt was a larger component of glacial runoff in Tarim Basin. The influence of rainfall runoff on glacier runoff was more obviously than snow melt runoff as more precipitation fell as rain in northern region. The larger proportions of snow melt runoff imply more precipitation fell as snowfall in southern region. The elevation‐dependent contributions in glacier runoff showed differences in individual basins. Temperature and precipitation played different role for the glacier runoff increases among the sub‐basins. Differences in sensitivity of GMB and glacier runoff were distinct and vary considerably. A thorough assessment of the spatially and temporally varying melt water originated by glaciers is crucial for the success of water scarcity adaptation under climate change.
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