Dynamics of Nonlinear Cross-Equatorial Flow. Part II: The Tropically Enhanced Instability of the Western Boundary Current
Dynamics of Nonlinear Cross-Equatorial Flow. Part II: The Tropically Enhanced Instability of the Western Boundary Current
复制标题
非线性越赤道流动力学。
DOI：
--
复制
发表时间：
1998
期刊：
影响因子：
--
通讯作者：
J. Pedlosky
中科院分区：
文献类型：
--
作者：
C. Edwards;J. Pedlosky
摘要对热带海洋浅水系统进行了线性稳定性分析，考察了西边界流的稳定性及其纬度依赖性。尽管一个高度理想化的配方，假设一个纯粹的基本状态，并使当地的f-平面近似，稳定性分析成功地预测了扰动的长度尺度，纬度为它的起源，和一个临界雷诺数，同意以及伴随的数值结果。现实的西部边界电流剖面经历了水平剪切不稳定，部分稳定的粘度。在几个纬度的增长率的计算表明，不稳定性增强的热带地区的内部变形半径是最大的。
Abstract A linear stability analysis of the shallow-water system in the tropical ocean examines the stability of the western boundary current and its latitudinal dependence. Despite a highly idealized formulation that assumes a purely meridional basic state and makes a local f-plane approximation, the stability analysis successfully predicts a length scale of the disturbance, a latitude for its origin, and a critical Reynolds number that agree well with accompanying numerical results. Realistic western boundary current profiles undergo a horizontal shear instability that is partially stabilized by viscosity. Calculations of the growth rate at several latitudes indicate that the instability is enhanced in the Tropics where the internal deformation radius is a maximum.