Subpolar Southern Ocean Seasonal Variability of the Geostrophic Circulation From Multi-Mission Satellite Altimetry
Subpolar Southern Ocean Seasonal Variability of the Geostrophic Circulation From Multi-Mission Satellite Altimetry
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DOI：
10.1029/2021jc018096
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发表时间：
2022-06-01
影响因子：
3.6
通讯作者：
Garabato, Alberto C. Naveira
中科院分区：
文献类型：
--
作者：
Auger, Matthis;Sallee, Jean-Baptiste;Garabato, Alberto C. Naveira
一种新的多卫星产品被用来阐明海面高度的季节性循环和相关的地转环流在副极地南大洋。我们发现控制海平面异常季节循环的三种主要变化模式，所有这些模式主要受风强迫的影响。季节性变化的主要模式与大尺度风应力旋度所支配的主要副极地环流的季节性有关，定性上与Sverdrup动力学一致。第二个季节性模式与受沿海东风影响的南极斜坡流（ASC）有关，异常海平面沿大陆斜坡沿着快速绕极传播，这与所谓的南方模式在动力学上是一致的。前两个模态在冬季引起涡旋和ASC的加速。第三个季节性模式似乎是由海冰调制的表面应力，并导致离岸扩展的ASC从秋季到冬季。
A novel multi-satellite product is used to shed light on the sea surface height seasonal cycle and associated geostrophic circulation in the subpolar Southern Ocean. We find three main modes of variability governing the Sea Level Anomaly seasonal cycle, all of them primarily governed by wind forcing. The main mode of seasonal variability is associated with the seasonality of the main subpolar gyres governed by large-scale wind stress curl, qualitatively consistent with Sverdrup dynamics. The second seasonal mode is related to the Antarctic Slope Current (ASC), governed by the coastal easterlies, with a rapid circumpolar propagation of anomalous sea-level along the continental slope that is dynamically consistent with the so-called Southern Mode. The first two modes induce an acceleration of the gyres and the ASC in winter. The third seasonal mode appears to be driven by sea ice-modulated surface stress and induces an offshore extension of the ASC from autumn to winter.