The Influence of Pine Island Ice Shelf Calving on Melting
The Influence of Pine Island Ice Shelf Calving on Melting
复制标题
松岛冰架崩解对融化的影响
DOI：
10.1002/essoar.10510805.1
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Bradley A
中科院分区：
文献类型：
--
作者：
Bradley A
松岛冰架下的海床——松岛35号冰川的漂浮延伸——以一个巨大的山脊为特色。这个海底脊和36华氏度以上的冰架的结合减少了能够到达冰架的相对温暖的水的数量，因此限制了可能发生的冰架融化的数量。然而，近年来，冰架的前部也失去了很大一部分，这一过程被称为“破冰”。在本文中，我们研究了这两个过程的综合作用：冰裂如何影响松岛冰架的融化速度？通过对冰架下海洋流动的数值模拟，我们确定了融化速率对冰裂的潜在高度敏感性，这取决于空腔的几何形状。这种敏感性主要与脊岸空腔内流动强度的变化有关。此外，我们的模拟表明，在进一步的冰裂事件中，融化速度将与冰锋后退的距离呈近似线性关系。这些结果提供了强有力的证据，表明冰裂引起的冰架融化的变化可能是西南极洲对气候变化的反应的重要因素。48
The seabed beneath Pine Island Ice Shelf–the floating extension of Pine Island 35 Glacier–features a large ridge. The combination of this seabed ridge and ice shelf above 36 it reduce the amount of relatively warm water that is able to reach the ice shelf, there-37 fore restricting the amount of ice shelf melting that can take place. However, the ice shelf 38 has also lost large sections from its front in recent years, in a process referred to as calv-39 ing. In this paper, we investigate the combined effect of these two processes: how does 40 calving affect the melt rates on Pine Island Ice Shelf? Using numerical simulations of 41 the ocean flow beneath the ice shelf, we identify a potentially high sensitivity of melt rates 42 to calving, depending on the cavity geometry. This sensitivity is primarily related to changes 43 in the flow strength in the cavity inshore of the ridge. In addition, our simulations sug-44 gest that the melt rate will have an approximately linear dependence on the distance that 45 the ice front retreats in further calving events. These results provide strong evidence that 46 changes in the melting of ice shelves in response to calving might represent an impor-47 tant contribution to the response of West Antarctica in a changing climate. 48