Xuanru Zhao, Jinquan Cheng, Weijin Guan, Yuxuan Zhang, Bo Cao
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引用次数: 0
摘要
在亚洲高山地区,大多数冰川和冰川湖在整个气候变化过程中都经历了快速变化。与陆地末端冰川不同,湖泊末端冰川由于冰川湖泊与冰川动力学之间的动态相互作用而呈现出快速收缩的现象。在这项研究中,我们详细分析了琼布库湖末端冰川的表面高程、速度,特别是锋面消融的变化。结果表明,与其他冰川相比,琼布错冰川的质量平衡为负值的两倍,年表面速度异常增加(每十年增加 3.6 m a-1),而其他冰川则呈下降趋势。随着前冰湖的加速扩张,琼布错冰川净质量损失中的锋面消融部分从 26% 增加到 52%。所有现有证据都表明,冰川湖与其所在冰川之间存在正反馈作用。我们的研究结果突出表明,冰川湖的存在会影响湖泊末端冰川的空间变化规律。此外,湖泊面积的不断扩大放大了与湖泊末端冰川演变相关的变化。
The Expanding of Proglacial Lake Amplified the Frontal Ablation of Jiongpu Co Glacier since 1985
In High Mountain Asia, most glaciers and glacial lakes have undergone rapid variations throughout changes in the climate. Unlike land-terminating glaciers, lake-terminating glaciers show rapid shrinkage due to dynamic interactions between proglacial lakes and glacier dynamics. In this study, we conducted a detailed analysis of the changes in the surface elevation, velocity, and especially frontal ablation on Jiongpu Co lake-terminating glacier. The results show that the Jiongpu Co glacier has twice as much negative mass balance compared to other glaciers, and the annual surface velocity has anomalously increased (3.6 m a−1 per decade) while other glaciers show a decreased trend. The frontal ablation fraction in the net mass loss of the Jiongpu Co glacier increased from 26% to 52% with the accelerated expansion of the proglacial lake. All available evidence indicates the presence of positive feedback between the proglacial lake and its host glacier. Our findings highlight the existence of proglacial lake affects the spatial change patterns of the lake-terminating glacier. Furthermore, the ongoing enlargement of the lake area amplifies the changes associated with the evolution of the lake-terminating glacier.