Bathymetric controls on calving processes at Pine Island Glacier
Bathymetric controls on calving processes at Pine Island Glacier
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DOI：
10.5194/tc-12-2039-2018
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发表时间：
2018-06-15
期刊：
影响因子：
5.2
通讯作者：
Hoeppner, Kathrin
中科院分区：
文献类型：
--
作者：
Arndt, Jan Erik;Larter, Robert D.;Hoeppner, Kathrin
松岛冰川是目前南极海平面上升的最大贡献者。在过去的25年里，由于变薄、加速和接地线后退，它的冰损失大大增加。然而，稳定冰架的产犊线位置在观测记录（过去70年）中没有显示任何趋势，直到2015年的产犊导致前所未有的退缩并改变了产犊前沿的排列。水深测量显示，前冰架下方有一个山脊，北部有两个较浅的高地。卫星图像显示，冰脊上的冰接触可能在2006年消失，但随后是间歇性的接触，导致冰架上的背应力波动。持续的冰架流动也导致冰架偶尔与北方水深高点接触，这引发了裂缝的形成，导致了冰解。观测结果表明，水深是引发产冰事件的一个重要因素。
Pine Island Glacier is the largest current Antarctic contributor to sea-level rise. Its ice loss has substantially increased over the last 25 years through thinning, acceleration and grounding line retreat. However, the calving line positions of the stabilising ice shelf did not show any trend within the observational record (last 70 years) until calving in 2015 led to unprecedented retreat and changed the alignment of the calving front. Bathymetric surveying revealed a ridge below the former ice shelf and two shallower highs to the north. Satellite imagery shows that ice contact on the ridge was likely lost in 2006 but was followed by intermittent contact resulting in back stress fluctuations on the ice shelf. Continuing ice-shelf flow also led to occasional ice-shelf contact with the northern bathymetric highs, which initiated rift formation that led to calving. The observations show that bathymetry is an important factor in initiating calving events.