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Connecting flow–topography interactions, vorticity balance, baroclinic instability and transport in the Southern Ocean: the case of an idealized storm track

机译:连接流动形貌相互作用,南洋中的漩涡平衡,曲金属不稳定性和运输:理想化风暴轨道的情况

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摘要

The dynamical balance of the Antarctic CircumpolarCurrent and its implications on the functioning of the world ocean are notfully understood and poorly represented in global circulation models. Inthis study, the sensitivities of an idealized Southern Ocean (SO) stormtrack are explored with a set of eddy-rich numerical simulations. Theclassical partition between barotropic and baroclinic modes is sensitive tocurrent–topography interactions in the mesoscale range 10–100 km, ascomparisons between simulations with rough or smooth bathymetry reveal.Configurations with a rough bottom have weak barotropic motions, ubiquitousbottom form stress/pressure torque, no wind-driven gyre in the lee oftopographic ridges, less efficient baroclinic turbulence and, thus, largercircumpolar transport rates. The difference in circumpolar transportproduced by topographic roughness depends on the strength with which(external) thermohaline forcings by the rest of the world ocean constrainthe stratification at the northern edge of the SO. The study highlights theneed for a more comprehensive treatment of the Antarctic Circumpolar Current(ACC) interactions with the ocean floor, including realistic fields ofbottom form stress and pressure torque. It also sheds some light on thebehavior of idealized storm tracks recently modeled: (i) the saturationmechanism, whereby the circumpolar transport does not depend on windintensity, is a robust and generic attribute of ACC-like circumpolar flows;(ii) the adjustment toward saturation can take place over widely differenttimescales (from months to years) depending on the possibility (or not) forbarotropic Rossby waves to propagate signals of wind change andaccelerate/decelerate SO wind-driven gyres. The real SO having both gyresand ACC saturation timescales typical of our “no gyre” simulations may bein an intermediate regime in which mesoscale topography away from majorridges provides partial and localized support for bottom formstress/pressure torque.
机译:在全球流通模型中,清晰地理解和对世界海洋运作的影响的动态平衡及其对世界海洋的运作的影响。 Inthis研究,探讨了理想化的南洋(SO)Stormtrack的敏感性,并通过一系列富涡富级数值模拟探索。波波分和曲烷基模式之间的曲线分区是敏感的米斯科的地形相互作用10-100公里,易于粗糙或光滑的沐浴淋巴结的模拟之间的差异。具有粗糙底部的粗糙度较弱的波波波特动作,普通型胶质形式应力/压力扭矩风力驱动的血管在leetoptographic山脊,较低的曲金湍流效率,因此,较大的巨大的运输速率。地形粗糙度传输的Circumpolar差异取决于在北边缘的世界海洋约束地区的其余部分(外部)热卤素强制强度。该研究突出了南极环球电流(ACC)与海底互动的更全面的处理,包括现实领域,形成压力和压力扭矩。它还在最近建模的理想风暴轨道上发出一些光线:(i)静止传输不依赖于风光度,是ACC等环形流动的鲁棒和通用属性;(ii)对饱和度的调整可以在广泛的不同细节(从几个月到几年)来取决于鲍罗特罗·罗斯比波的可能性(或不)传播风力变化和减速所以风驱动的旋转的可能性(或不)。真正的诸如拥有的Gyresand Acc饱和时间尺寸典型的典型的“No Gyre”模拟可能是一种中间方案,其中远离MamirIdges的Mesoscale地形提供了对底部污染/压力扭矩的部分和局部支持。

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  • 作者

    Julien Jouanno; Xavier Capet;

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  • 年度 2020
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  • 原文格式 PDF
  • 正文语种 eng
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