Repeated Tidally Induced Hydrofracture of a Supraglacial Lake at the Amery Ice Shelf Grounding Zone
Repeated Tidally Induced Hydrofracture of a Supraglacial Lake at the Amery Ice Shelf Grounding Zone
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阿默里冰架接地区冰上湖反复潮汐引起的水力压裂
DOI：
10.1029/2021gl095661
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发表时间：
2022
影响因子：
5.2
通讯作者：
Moussavi, Mahsa
中科院分区：
文献类型：
--
作者：
Trusel, Luke D.;Pan, Zhuolai;Moussavi, Mahsa
表面融化和湖泊是南极冰架的常见现象，它们的存在和排水被认为是冰架崩溃的前兆。在这里，我们提出了2014-2020年在南极洲东部Amery冰架接地区的冰上湖的重复，快速排水的卫星观测。2018年的排水后图像揭示了快速垂直湖泊排水的湖底特征。观察到的湖泊体积表明排水量与阈值融水体积无关。相反，排水通常与每日潮汐振幅高的时期相吻合，这表明水力压裂是由潮汐迫使冰架接地区固有的弯曲。结合广泛的接地区湖泊排水的观察，这些研究结果表明，冰架融水的积累可能会受到接地区排水事件的抑制，因此代表了一个潜在的稳定机制，尽管这些地区共同增强融化。
Surface melting and lakes are common to Antarctic ice shelves, and their existence and drainages have been invoked as a precursor for ice shelf collapse. Here, we present satellite observations over 2014–2020 of repeated, rapid drainages of a supraglacial lake at the grounding zone of Amery Ice Shelf, East Antarctica. Post‐drainage imagery in 2018 reveals lake bottom features characteristic of rapid, vertical lake drainage. Observed lake volumes indicate drainages are not associated with a threshold meltwater volume. Instead, drainages typically coincide with periods of high daily tidal amplitude, suggesting hydrofracture is assisted by tidally forced ice flexure inherent to the ice shelf grounding zone. Combined with observations of widespread grounding zone lake drainages on Amery, these findings indicate ice shelf meltwater accumulation may be inhibited by grounding zone drainage events, thus representing a potential stabilizing mechanism despite enhanced melting common to these regions.
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影响因子：
5.2
作者：
Warner RC;Fricker HA;Adusumilli S;Arndt P;Kingslake J;Spergel JJ
通讯作者：
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影响因子：
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作者：
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matplotlib/matplotlib：相对：v3.2.2
影响因子：
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影响因子：
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