Extraction of Potential Energy from Geostrophic Fronts by Inertial–Symmetric Instabilities
Extraction of Potential Energy from Geostrophic Fronts by Inertial–Symmetric Instabilities
复制标题
通过惯性对称不稳定性从地转锋面提取势能
DOI：
10.1175/jpo-d-17-0160.1
复制
发表时间：
2018
影响因子：
3.5
通讯作者：
N. Grisouard
中科院分区：
文献类型：
--
作者：
N. Grisouard
摘要亚中尺度海洋密度锋是地转和静水平衡结构，容易发生惯性和对称不稳定。本文认为地转流的势能排水是其生长的重要来源。我们用f平面上海洋密度锋的二维Boussinesq数值模拟来说明我们的观点。一组二维初始条件覆盖了由理查森数和罗斯比数组成的三维参数空间的亚中尺度部分以及层积或纬度的度量。因为我们让横向密度梯度随深度衰减，所以参数空间映射是非平凡的，不包括低罗斯比、低理查德森组合。耗散和边界的存在选择了一种惯性对称不稳定的增长模式，该模式由干扰等平轮廓的流胞组成。系统地，这些等反位移对应于从…
AbstractSubmesoscale oceanic density fronts are structures in geostrophic and hydrostatic balance, which are prone to inertial and/or symmetric instabilities. We argue in this article that drainage of potential energy from the geostrophic flow is a significant source of their growth. We illustrate our point with two-dimensional Boussinesq numerical simulations of oceanic density fronts on the f plane. A set of two-dimensional initial conditions covers the submesoscale portion of a three-dimensional parameter space consisting of the Richardson and Rossby numbers and a measure of stratification or latitude. Because we let the lateral density gradient decay with depth, the parameter space map is nontrivial, excluding low-Rossby, low-Richardson combinations. Dissipation and the presence of boundaries select a growing mode of inertial–symmetric instability consisting of flow cells that disturb isopycnal contours. Systematically, these isopycnal displacements correspond to a drainage of potential energy from th...
影响因子：
3.2
作者：
Bachman, S. D.;Taylor, J. R.
通讯作者：
Taylor, J. R.