Ocean variability beneath Thwaites Eastern Ice Shelf driven by the Pine Island Bay Gyre strength.
Ocean variability beneath Thwaites Eastern Ice Shelf driven by the Pine Island Bay Gyre strength.
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DOI：
10.1038/s41467-022-35499-5
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发表时间：
2022-12-21
影响因子：
16.6
通讯作者：
Pettit, Erin
中科院分区：
文献类型：
--
作者：
Dotto, Tiago S.;Heywood, Karen J.;Hall, Rob A.;Scambos, Ted A.;Zheng, Yixi;Nakayama, Yoshihiro;Hyogo, Shuntaro;Snow, Tasha;Wahlin, Anna K.;Wild, Christian;Truffer, Martin;Muto, Atsuhiro;Alley, Karen E.;Boehme, Lars;Bortolotto, Guilherme A.;Tyler, Scott W.;Pettit, Erin
西南极冰架变薄主要是由海洋驱动的基底融化造成的。在这里，我们评估Thwaites东部冰架（TEIS）以下的海洋变化，并揭示当地海洋环流和海冰的重要性。从2020年1月至2021年3月的两个冰架下停泊处获得的测量结果显示，冰架空腔变暖，上层冰下层的融水比例增加。结合海洋模拟结果，我们的观察表明，融水从松岛冰架饲料到TEIS腔，增加了水平热传输。我们认为，从2020年4月到2021年3月，由于海冰覆盖时间延长，松岛湾环流减弱，使融水富集的沃茨进入TEIS空腔，从而增加了上层的温度。我们的研究强调了冰架下的海洋环流对邻近开阔海洋中当地大气-海冰-海洋强迫的敏感性。松岛湾的海洋环流较弱，受到斯韦茨东冰架附近海洋上海冰浓度较高的抑制，使更多的融水进入冰架下的空腔。这增加了冰下的海洋温度。
West Antarctic ice-shelf thinning is primarily caused by ocean-driven basal melting. Here we assess ocean variability below Thwaites Eastern Ice Shelf (TEIS) and reveal the importance of local ocean circulation and sea-ice. Measurements obtained from two sub-ice-shelf moorings, spanning January 2020 to March 2021, show warming of the ice-shelf cavity and an increase in meltwater fraction of the upper sub-ice layer. Combined with ocean modelling results, our observations suggest that meltwater from Pine Island Ice Shelf feeds into the TEIS cavity, adding to horizontal heat transport there. We propose that a weakening of the Pine Island Bay gyre caused by prolonged sea-ice cover from April 2020 to March 2021 allowed meltwater-enriched waters to enter the TEIS cavity, which increased the temperature of the upper layer. Our study highlights the sensitivity of ocean circulation beneath ice shelves to local atmosphere-sea-ice-ocean forcing in neighbouring open oceans. A weaker ocean gyre in the Pine Island Bay, suppressed by higher sea-ice concentration over the ocean near the Thwaites Eastern Ice Shelf, allows more meltwater to enter the sub-ice-shelf cavity. This increases the ocean temperature beneath the ice.
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通讯作者：
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