Instantaneous Antarctic ice sheet mass loss driven by thinning ice shelves
Instantaneous Antarctic ice sheet mass loss driven by thinning ice shelves
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DOI：
10.1029/2019gl085027
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发表时间：
2019-12-11
影响因子：
5.2
通讯作者：
Fricker, Helen A.
中科院分区：
文献类型：
--
作者：
Gudmundsson, G. Hilmar;Paolo, Fernando S.;Fricker, Helen A.
最近的观测表明，南极冰盖（AIS）导致海平面上升的速度正在加快。冰海热交换的增加有可能通过冰架融化导致大量质量损失。然而，数据的缺乏和建模的局限性使得量化海洋引起的冰架厚度变化作为持续质量损失驱动因素的重要性变得具有挑战性。在这里，我们使用数值冰盖模型结合 1994 年至 2017 年冰架变薄的卫星观测来量化所有 AIS 接地线上冰流的瞬时变化，这些变化是由冰架支撑本身的变化引起的。我们基于过程的预测与观测到的冰损失的空间模式非常一致，这为以下观点提供了支持：AIS 当前的冰损失很大一部分是海洋驱动的，是由冰架支撑减少引起的。
Recent observations show that the rate at which the Antarctic ice sheet (AIS) is contributing to sea level rise is increasing. Increases in ice-ocean heat exchange have the potential to induce substantial mass loss through the melting of its ice shelves. Lack of data and limitations in modeling, however, has made it challenging to quantify the importance of ocean-induced changes in ice shelf thickness as a driver for ongoing mass loss. Here, we use a numerical ice sheet model in combination with satellite observations of ice shelf thinning from 1994 to 2017 to quantify instantaneous changes in ice flow across all AIS grounding lines, resulting from changes in ice shelf buttressing alone. Our process-based predictions are in good agreement with observed spatial patterns of ice loss, providing support for the notion that a significant portion of the current ice loss of the AIS is ocean driven and caused by a reduction in ice shelf buttressing.