During the last few decades, the lake-terminating glaciers in the Himalaya have receded faster than the land-terminating glaciers as proglacial lakes have exacerbated the mass loss of their host glaciers. Monitoring the impacts of glacier recession and dynamics on lake extent and water volume provides an approach to assess the mass interplay between glaciers and proglacial lakes. We describe the recession of Longbasaba Glacier and estimate the mass wastage and its contribution to the water volume of its proglacial lake. The results show that the glacier area has decreased by 3% during 1988–2018, with a more variable recession prior to 2008 than in the last decade. Longbasaba Lake has expanded by 164% in area and 237% in water volume, primarily as a result of meltwater inflow produced from surface lowering of the glacier. Over the periods 1988–2000 and 2000–18, the mass loss contributed by glacier thinning has decreased from 81 to 61% of the total mass loss, accompanied by a nearly doubled contribution from terminus retreat. With the current rate of retreat, Longbasaba glacier is expected to terminate in its proglacial lake for another four decades. The hazard risk of this lake is expected to continue to increase in the near future because of the projected continued glacier mass loss and related lake expansion.

中文翻译：

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1988 年至 2018 年隆巴萨巴冰川退缩及其对前冰河湖体积的贡献

在过去的几十年中，由于前冰河湖泊加剧了其宿主冰川的质量损失，喜马拉雅的湖泊终止冰川比陆地终止冰川退缩得更快。监测冰川退缩和动态对湖泊范围和水量的影响，为评估冰川和前冰川湖之间的大规模相互作用提供了一种方法。我们描述了 Longbasaba Glacier 的衰退，并估计了大规模浪费及其对前冰河湖水量的贡献。结果表明，冰川面积在 1988-2018 年间减少了 3%，2008 年之前的衰退比过去十年更加多变。龙巴萨巴湖面积扩大了 164%，水量扩大了 237%，这主要是由于冰川地表下降产生的融水流入。在 1988-2000 年和 2000-18 年期间，冰川变薄造成的质量损失已从总质量损失的 81% 减少到 61%，同时终点退缩的贡献几乎翻了一番。以目前的退缩速度，预计龙巴萨巴冰川将在其前冰湖中终止 40 年。由于预计冰川质量的持续损失和相关的湖泊扩张，预计该湖的危害风险将在不久的将来继续增加。