Localized Plumes Drive Front‐Wide Ocean Melting of A Greenlandic Tidewater Glacier

Localized Plumes Drive Front‐Wide Ocean Melting of A Greenlandic Tidewater Glacier
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局部羽流驱动格陵兰潮水冰川的大洋融化

DOI:
10.1029/2018gl080763
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发表时间:
2018
影响因子:
5.2
通讯作者:
Nienow, P. W.
Nienow, P. W.
中科院分区:
地球科学1区
文献类型:
--
作者:
Slater, D. A.;Straneo, F.;Das, S. B.;Richards, C. G.;Wagner, T. J. W.;Nienow, P. W.

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最近格陵兰岛海洋终止冰川的加速大大增加了冰盖对全球海平面的贡献。这些冰川的海洋融化被广泛认为是可能的触发因素,并且被认为是冰川下淡水排水驱动的活跃羽流中最高的。然而,羽流外的大部分产犊锋的融化仍在很大程度上未被研究。在这里,我们结合联合收割机海洋观测收集的100米内的冰川与数值模型表明,不像以前假设的,羽驱动一个充满活力的峡湾范围内的环流,增强融化沿着整个崩解锋。与仅在羽流内融化的估计相比,这种峡湾范围的环流有效地使冰川范围的融化速率翻了一番,并通过塑造崩解锋对崩解产生潜在的动态影响。我们的研究结果表明,融化驱动的峡湾尺度环流应考虑在格陵兰岛的海平面贡献的过程为基础的预测。
Recent acceleration of Greenland's ocean‐terminating glaciers has substantially amplified the ice sheet's contribution to global sea level. Increased oceanic melting of these tidewater glaciers is widely cited as the likely trigger, and is thought to be highest within vigorous plumes driven by freshwater drainage from beneath glaciers. Yet melting of the larger part of calving fronts outside of plumes remains largely unstudied. Here we combine ocean observations collected within 100 m of a tidewater glacier with a numerical model to show that unlike previously assumed, plumes drive an energetic fjord‐wide circulation which enhances melting along the entire calving front. Compared to estimates of melting within plumes alone, this fjord‐wide circulation effectively doubles the glacier‐wide melt rate, and through shaping the calving front has a potential dynamic impact on calving. Our results suggest that melting driven by fjord‐scale circulation should be considered in process‐based projections of Greenland's sea level contribution.
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