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首页> 外文期刊>Journal of Physical Oceanography >Three-Dimensional Dynamics of the Subsurface Countercurrents and Equatorial Thermostad. Part Ⅰ: Formulation of the Problem and Generic Properties
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Three-Dimensional Dynamics of the Subsurface Countercurrents and Equatorial Thermostad. Part Ⅰ: Formulation of the Problem and Generic Properties

机译：地下逆流和赤道热阻的三维动力学。第一部分：问题和一般性质的表述

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A fully three-dimensional primitive equation simulation is performed to "reunite" the local equatorial dynamics of the subsurface countercurrents (SCCs) and thermostad with the large-scale tropical ventilated ocean dynamics. It captures (ⅰ) the main characteristics of the equatorial thermostad, the SCCs' location and their eastward evolution, and the potential vorticity budget with its equatorial homogenization to zero values and (ⅱ) the large-scale meridional shoaling of the thermocline equatorward. It supports the idea that the two-dimensional Hadley cell mechanism proposed by Marin et al. Is a candidate able to operate in a fully three-dimensional ocean. The main difference between the 2D Hadley cell mechanism and the oceanic 3D case is that for the 3D case the large-scale meridional velocity at zeroth order is geostrophic, while the cell mechanism is a next-order, small-scale mechanism. A detailed budget of the zonal momentum equation is provided for the ageostrophic dynamics at work in the SCCs. The mean meridional advection and the Coriolis term dominate, discounting the possibility that lateral eddies play a major role for the SCCs' creation. A 3(1/2)-layer idealized ventilation model, calibrated to the three-dimensional simulation parameters, is able not only to capture the tropical density structure, but also to isolate the main controlling factors leading to the triggering of the equatorial secondary cells with its associated jet and thermostad, namely, the shoaling of the equatorial thermocline because of low potential vorticity injection at distant subduction latitudes. It is also shown that equatorial recirculation gyres play a quantitative role that may be of the same order of magnitude as ventilation from higher latitudes.
机译：进行了完整的三维原始方程式仿真，以“统一”地下逆流（SCC）和热稳定区的局部赤道动力学，以及大规模的热带通风海洋动力学。它捕获（ⅰ）赤道热区的主要特征，南海SCC的位置及其向东演化，以及赤道均化为零值的潜在涡度预算和（ⅱ）跃层向赤道的大尺度子午向暗流。它支持了Marin等人提出的二维Hadley细胞机制的观点。是能够在三维海洋中运作的候选人。 2D Hadley单元机制与海洋3D情况之间的主要区别在于，对于3D情况，零级的大子午线速度是地转的，而单元机制是次级的小规模子午线。提供了区域动量方程的详细预算，以用于SCC中的变地动力学。平均经向平流和科里奥利术语占主导地位，这消除了横向涡流在SCC的产生中起主要作用的可能性。根据三维模拟参数校准的3（1/2）层理想通风模型不仅能够捕获热带密度结构，而且能够隔离导致赤道二次电池触发的主要控制因素伴随其相关的射流和热力场，即由于在远俯冲纬度上低的潜在涡度注入，赤道温跃层的暗流。还表明，赤道回旋涡流起着定量作用，其作用可能与高纬度地区的通风相同。

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