Impact of Subglacial Freshwater Discharge on Pine Island Ice Shelf

Impact of Subglacial Freshwater Discharge on Pine Island Ice Shelf
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冰下淡水排放对松岛冰架的影响

DOI:
10.1029/2021gl093923
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发表时间:
2021
影响因子:
5.2
通讯作者:
Seroussi Helene
Seroussi Helene
中科院分区:
地球科学1区
文献类型:
--
作者:
Nakayama Yoshihiro;Cai Cilan;Seroussi Helene

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基于卫星的冰架融化速度估计接近西南极洲松岛冰川接地线 200 米。然而,即使使用高分辨率模型,海洋模拟仍无法重现如此高的融化速率。在这里,我们使用松岛冰架空腔的区域模型,研究冰下淡水排放对模拟冰架融化速率和空腔内海洋环流的影响。我们表明,冰下淡水排放大大增强了靠近接地线的冰架融化,成功模拟了观测表明的高冰架融化速率。冰川融水羽流的浮力混合物随着地形限制的水流上升到 27.4 等重面,并扩散到冰架前沿的中深度。鉴于松岛盆地径流和降雨的预计演变,淡水排放的作用在未来几十年可能保持不变。
Satellite‐based estimates of ice shelf melt rates reach 200 m  close to the grounding line of Pine Island Glacier, in West Antarctica. However, ocean simulations have not yet been able to reproduce such high melt rates, even with high‐resolution models. Here, we use a regional model of Pine Island ice shelf cavity and study the impact of subglacial freshwater discharge on simulated ice shelf melt rates and ocean circulation in the cavity. We show that subglacial freshwater discharge substantially enhances ice shelf melting close to the grounding line, successfully simulating high ice shelf melt rates suggested by observations. The buoyant mixture of glacial meltwater plume rises to 27.4 isopycnal surfaces, following topographically constrained current, and spreads into mid‐depths at the ice shelf front. The role of freshwater discharge is likely to remain unchanged over the coming decades given the projected evolution of runoff and rainfall over Pine Island basin.
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