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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Interannual flow dynamics driven by frontal retreat of a lake-terminating glacier in the Chinese Central Himalaya
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Interannual flow dynamics driven by frontal retreat of a lake-terminating glacier in the Chinese Central Himalaya

机译：由中国中央喜马拉雅亚湖终端冰川的正面撤退驱动的际流动动力学

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Most lake-terminating glaciers in the Himalaya retreat rapidly due to periodic frontal ice loss at their terminus, but long-term observations are still limited regarding their flow dynamics, which is crucial for understanding the processes of ice mass loss and proglacial lake growth. We present multi-decadal surface velocity dynamics of the Longbasaba Glacier, a rapid retreating lake-terminating glacier in the Chinese Himalaya, using an image feature tracking method applied on optical satellite images between 1989 and 2018. We show that, in companion with rapid retreat (-51.7 m a(-1)), its lower 5 km tongue experienced high interannual fluctuations in velocity, comprising periodic acceleration and slowdown in 1989-1995 and 2001-2010 and a recent remarkable acceleration since 2012. The temporal variation of longitudinal velocity distribution indicates an upward propagation of the lake-ward acceleration (namely a downglacier inversion of strain from compression to extension). This propagation is coupled to the retreat of the glacier front and occurs along the lowermost 1 similar to 1.5 km lake-adjacent section as the proglacial lake expands. The most recent acceleration of the near-lake section since 2012 has likely facilitated a dynamic thinning on its upper sections, where flow acceleration started two years later in 2014. This pattern contrasts markedly with a nearby decelerating land-terminating glacier, which has experienced a much slower retreat rate (-7.8 m a(-1)) and the same magnitude of mean thinning rate at its lower part since 2000. Our results confirm the strong influence of the proglacial lake on ice flow dynamics and suggest that lake-ice interactions are important to consider when analyzing, interpreting or modeling dynamics of rapidly retreating lake-terminating glaciers in the Himalayas as well as around the world. (C) 2020 Elsevier B.V. All rights reserved.
机译：由于它们的终点，大多数湖泊终止冰川迅速迅速撤退，但长期观测仍然有限，关于它们的流动动态，这对于了解冰块损失和前期湖泊生长的过程至关重要。我们展示了Longbasaba Glacier的多层表面速度动态，这是在中国喜马拉雅的快速撤退湖终端冰川，使用于1989年至2018年间光学卫星图像上的图像特征跟踪方法。我们展示了快速撤退的伴侣（-51.7 mA（-1）），其下部5公里的舌头在1989-1995和2001-2010中包括定期加速和放缓，并自2012年以来的最近的卓越加速度。纵向速度分布的时间变化表明湖泊 - 沃德加速度向上传播（即，从压制到扩展的菌株的下层反转）。随着Prooglacial Lake膨胀，这种传播耦合到冰川前正面的撤退，并且沿着最下面的1沿着最下部的湖泊相邻部分。自2012年以来的近湖部分最近的加速度可能促进了其上部的动态变薄，其中流动加速在2014年两年后开始。这种模式与附近的冰川显着对比，这是经历过的附近的陆地终端冰川。自2000年以来，较慢的退缩速率（-7.8 mA（-1））和平均稀释率相同的平均稀薄率。我们的结果证实了Prooglacial湖对冰流动力学的强烈影响，并表明湖 - 冰相互作用在分析，解释或建模在喜马拉雅山以及世界各地的快速撤退湖终止冰川的动态的重要性。 （c）2020 Elsevier B.v.保留所有权利。

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