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首页> 外文期刊>Journal of Physical Oceanography >Multiple Zonal Jets in a Differentially Heated Rotating Annulus
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Multiple Zonal Jets in a Differentially Heated Rotating Annulus

机译：旋转加热环空中的多个区域射流

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摘要

A laboratory experiment of multiple baroclinic zonal jets is described, thought to be dynamically similar to flow observed in the Antarctic Circumpolar Current. Differential heating sets the overall temperature difference and drives unstable baroclinic flow, but the circulation is free to determine its own structure and local stratification; experiments were run to a stationary state and extend the dynamical regime of previous experiments. A topographic analog to the planetary beta effect is imposed by the gradient of fluid depth with radius supplied by a sloping bottom and a parabolic free surface. New regimes of a low thermal Rossby number (ROT similar to 10(-3)) and high Taylor number (Ta similar to 10(11)) are explored such that the deformation radius L-rho is much smaller than the annulus gap width L and similar to the Rhines length. Multiple jets emerge in rough proportion to the smallness of the Rhines scale, relatively insensitive to the Taylor number; a regime diagram taking the beta effect into account better reflects the emergence of the jets. Eddy momentum fluxes are consistent with an active role in maintaining the jets, and jet development appears to follow the Vallis and Maltrud phenomenology of anisotropic wave turbulence interaction on a beta plane. Intermittency and episodes of coherent meridional jet migration occur, especially during spinup.
机译：描述了多个斜斜带状射流的实验室实验，认为与南极绕极流中观察到的流动动态相似。差热设定了整体温差并推动了不稳定的斜压流，但是循环可以自由地确定其自身的结构和局部分层。实验进行到稳态，并扩展了先前实验的动态范围。行星β效应的地形模拟是由倾斜的底部和抛物线形自由表面提供的半径与半径的流体深度梯度所决定的。探索了低热罗斯比数（ROT类似于10（-3））和高泰勒数（Ta类似于10（11））的新状态，以使变形半径L-rho小于环隙宽度L和莱茵河的长度相似。多股喷流与莱茵河规模的缩小成比例，对泰勒数相对不敏感。一个考虑到贝塔效应的状态图更好地反映了喷气式飞机的出现。涡动量通量与维持射流的积极作用是一致的，射流的发展似乎遵循β平面上各向异性波湍流相互作用的Vallis和Maltrud现象。发生间歇性和相干子午射流迁移的现象，特别是在加速旋转过程中。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第9期|2273-2291|共19页
  • 作者

    Smith Carlowen A.; Speer Kevin G.; Griffiths Ross W.;

  • 作者单位

    Florida State Univ, Inst Geophys Fluid Dynam, Tallahassee, FL 32306 USA|Florida State Univ, Dept Earth Ocean & Atmospher Sci, Tallahassee, FL 32306 USA;

    Florida State Univ, Inst Geophys Fluid Dynam, Tallahassee, FL 32306 USA|Florida State Univ, Dept Earth Ocean & Atmospher Sci, Tallahassee, FL 32306 USA;

    Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT, Australia;

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