Ice front retreat reconfigures meltwater-driven gyres modulating ocean heat delivery to an Antarctic ice shelf.
Ice front retreat reconfigures meltwater-driven gyres modulating ocean heat delivery to an Antarctic ice shelf.
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DOI：
10.1038/s41467-022-27968-8
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发表时间：
2022-01-13
影响因子：
16.6
通讯作者：
Bradley AT
中科院分区：
文献类型：
--
作者：
Yoon ST;Lee WS;Nam S;Lee CK;Yun S;Heywood K;Boehme L;Zheng Y;Lee I;Choi Y;Jenkins A;Jin EK;Larter R;Wellner J;Dutrieux P;Bradley AT
松岛冰架（PIIS）支撑着松岛冰川，这是海平面上升的关键因素。PIIS由于海洋融化而变薄，其裂解锋已经退缩，导致支撑损失。PIIS融化主要取决于其前部温跃层的变化。此外，当地的海洋环流的变化调整松岛湾（PIB）内的热量输送，但海洋过程的冰锋撤退仍然不清楚。在这里，我们报告了一个PIB双环流，移动与PIIS产犊前，并假设它控制海洋热量输入PIIS。冰川融水在PIIS附近和附近产生气旋和反气旋环流，融水流出汇聚成反气旋环流，并具有深凸向下的温跃层。双环流向东迁移，作为崩解前撤退，把反气旋环流浅海底脊，减少海洋热量输入PIIS。与移动冰边界相关的融水驱动的环流的重构可能是至关重要的调制海洋热量输送到冰川冰。正如南极洲松岛湾地区的直接观测所揭示的那样，冰川融化可以改变热量输送，从而改变与冰锋退缩有关的海洋过程。
Pine Island Ice Shelf (PIIS) buttresses the Pine Island Glacier, the key contributor to sea-level rise. PIIS has thinned owing to ocean-driven melting, and its calving front has retreated, leading to buttressing loss. PIIS melting depends primarily on the thermocline variability in its front. Furthermore, local ocean circulation shifts adjust heat transport within Pine Island Bay (PIB), yet oceanic processes underlying the ice front retreat remain unclear. Here, we report a PIB double-gyre that moves with the PIIS calving front and hypothesise that it controls ocean heat input towards PIIS. Glacial melt generates cyclonic and anticyclonic gyres near and off PIIS, and meltwater outflows converge into the anticyclonic gyre with a deep-convex-downward thermocline. The double-gyre migrated eastward as the calving front retreated, placing the anticyclonic gyre over a shallow seafloor ridge, reducing the ocean heat input towards PIIS. Reconfigurations of meltwater-driven gyres associated with moving ice boundaries might be crucial in modulating ocean heat delivery to glacial ice. Glacial melt can modify heat transport, and therefore ocean processes, associated with ice front retreat, as revealed by direct observations from the Pine Island Bay region of Antarctica.
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影响因子：
5.2
作者：
Daae, K.;Hattermann, T.;Hellmer, H. H.
通讯作者：
Hellmer, H. H.
影响因子：
5.1
作者：
Asay-Davis, Xylar S.;Cornford, Stephen L.;Seroussi, Helene
通讯作者：
Seroussi, Helene
影响因子：
5.2
作者：
Jeong, Seongsu;Howat, Ian M.;Bassis, Jeremy N.
通讯作者：
Bassis, Jeremy N.
影响因子：
18.3
作者：
Adusumilli S;Fricker HA;Medley B;Padman L;Siegfried MR
通讯作者：
Siegfried MR
影响因子：
3.6
作者：
Biddle, Louise C.;Loose, Brice;Heywood, Karen J.
通讯作者：
Heywood, Karen J.