The modification of turbulent thermal wind balance by non-traditional effects

The modification of turbulent thermal wind balance by non-traditional effects
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非传统效应对湍流热风平衡的修正

DOI:
10.1017/jfm.2021.669
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发表时间:
2021
影响因子:
3.7
通讯作者:
Crowe M
Crowe M
中科院分区:
工程技术2区
文献类型:
--
作者:
Crowe M

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在地球物理背景下,地球自转的经向分量常常被忽略。这被称为“传统近似”,并且通过此类问题的通常较小的垂直速度和纵横比来证明是合理的。海洋前缘是水平浮力梯度较强的区域,与示踪剂和营养物的强烈垂直输送有关。鉴于这些相对较大的垂直速度,非传统旋转可能在控制锋面动力学方面发挥作用。这里使用渐进方法考虑非传统旋转对湍流热风平衡锋面的影响。提出了一般水平浮力剖面的解决方案,并在直前部的简单情况下进行了检查。研究发现,非传统效应在很大程度上取决于锋面的方向,并可能导致急流的产生以及锋面环流和垂直输送的改变。
The meridional component of the earth's rotation is often neglected in geophysical contexts. This is referred to as the ‘traditional approximation’ and is justified by the typically small vertical velocity and aspect ratio of such problems. Ocean fronts are regions of strong horizontal buoyancy gradient and are associated with strong vertical transport of tracers and nutrients. Given these comparatively large vertical velocities, non-traditional rotation may play a role in governing frontal dynamics. Here the effects of non-traditional rotation on a front in turbulent thermal wind balance are considered using an asymptotic approach. Solutions are presented for a general horizontal buoyancy profile and examined in the simple case of a straight front. Non-traditional effects are found to depend strongly on the direction of the front and may lead to the generation of jets and the modification of the frontal circulation and vertical transport.
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