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The role of turbulence in strong submesoscale fronts of the Bay of Bengal

机译：湍流在孟加拉湾的强子岩尺度前的作用

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摘要

The evolution of turbulence in a shallow submesoscale front is investigated using high-resolution large-eddy simulations (LES). The model front has uniquely large cross-front temperature and salinity differences motivated by recent observations in the Bay of Bengal. The temperature and salinity differences are increased in a parametric study to examine their effects on the evolution of turbulence. Shear turbulence induced by the initially geostrophic jet causes the front to slump and an ageostrophic secondary circulation (ASC) develops. The ASC is composed of two rotating currents: a surface gravity current (SGC) with cold fresh water above a counter-current (CC) jet with warm saline water. Virtual moorings on the two sides of the front are used to depict the evolution of stratification, shear, turbulent stresses, turbulent heat and salt fluxes, as well as turbulent kinetic energy (TKE) budget terms. A barrier layer with thermal inversion develops on both sides of the front while the mixed layer depth becomes shallower across the front. Turbulent production driven by vertical shear is the dominant source of TKE on both sides of the front and horizontal shear production also contributes significantly to the TKE generation. The turbulent stresses, heat and salt fluxes are enhanced on both sides of the front with subsurface warming in the thermal inversion layers. As the cross-front temperature and salinity differences increase among the cases, the ASC intensifies, and the currents and the turbulence become stronger.
机译：使用高分辨率大涡模拟（LES）研究了浅埋浅层前线湍流的演变。模型前线具有唯一大的横向温度和盐度差异，最近在孟加拉湾的观察中的观察。在参数研究中，温度和盐度差异增加，以检查它们对湍流演变的影响。由最初的热脑喷射引起的剪切湍流导致前方坍落度和肌醇二次循环（ASC）发展。 ASC由两个旋转电流组成：表面重力电流（SGC），具有高于逆流（CC）射流的冷淡水，具有温热的盐水。前面两侧的虚拟系泊用于描绘分层，剪切，湍流应力，湍流热量和盐通量以及湍流动能（TKE）预算术语的演变。具有热反转的阻挡层在前面的两侧发生，而混合层深度变得浅。垂直剪切驱动的湍流生产是前部和水平剪切产量两侧的TKE的主要来源也有助于TKE的产生。在前部的两侧具有湍流应力，热量和盐通量，在热反转层中具有地下升温。随着横向温度和盐度差异增加，ASC增强，电流和湍流变得更强。

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  • 来源
    《Deep-Sea Research》 |2019年第10期|104644.1-104644.18|共18页
  • 作者

    Pham Hieu T.; Sarkar Sutanu;

  • 作者单位

    Mech & Aerosp Engn San Diego CA USA;

    Mech & Aerosp Engn San Diego CA USA|Univ Calif San Diego Scripps Inst Oceanog La Jolla CA 92093 USA;

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