Submesoscale Rossby waves on the Antarctic circumpolar current.
Submesoscale Rossby waves on the Antarctic circumpolar current.
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DOI：
10.1126/sciadv.aao2824
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发表时间：
2018-03
期刊：
影响因子：
13.6
通讯作者：
Torres R
中科院分区：
文献类型：
--
作者：
Taylor JR;Bachman S;Stamper M;Hosegood P;Adams K;Sallee JB;Torres R
亚中尺度Rossby波被发现沿着南极绕极流，它们驱动强大的垂直环流。向东流动的南极绕极流（ACC）在全球海洋翻转环流中起着中心作用，并促进海洋表面和内部之间的水交换。在上层海洋经常观察到尺度在1至10公里之间的次中尺度涡旋和锋面，这些涡旋和锋面与强垂直环流和增强的层化有关。尽管它们在其他地方很重要，但对南大洋的亚中尺度生物知之甚少。我们提出的结果，从新的观测，模型和理论表明，submesoscales定性改变强射流与ACC在斯科舍海，德雷克海峡以东。增长的亚中尺度扰动发展沿着一个密集的细丝，并转化为亚中尺度Rossby波，传播上游相对于东急流。不像在较慢的电流，亚中尺度的罗斯贝波不破坏底层的锋面结构。次中尺度不稳定性的发展导致了与密集出露的细丝相关联的水的强的净俯冲，并且之后，次中尺度Rossby波与强烈的垂直环流相关联。
Submesoscale Rossby waves are found along the Antarctic circumpolar current where they drive strong vertical circulations. The eastward-flowing Antarctic circumpolar current (ACC) plays a central role in the global ocean overturning circulation and facilitates the exchange of water between the ocean surface and interior. Submesoscale eddies and fronts with scales between 1 and 10 km are regularly observed in the upper ocean and are associated with strong vertical circulations and enhanced stratification. Despite their importance in other locations, comparatively little is known about submesoscales in the Southern Ocean. We present results from new observations, models, and theories showing that submesoscales are qualitatively changed by the strong jet associated with the ACC in the Scotia Sea, east of Drake Passage. Growing submesoscale disturbances develop along a dense filament and are transformed into submesoscale Rossby waves, which propagate upstream relative to the eastward jet. Unlike their counterparts in slower currents, the submesoscale Rossby waves do not destroy the underlying frontal structure. The development of submesoscale instabilities leads to strong net subduction of water associated with a dense outcropping filament, and later, the submesoscale Rossby waves are associated with intense vertical circulations.
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