The behavior of jet currents over a continental slope topography with a possible application to the northern current
The behavior of jet currents over a continental slope topography with a possible application to the northern current
复制标题
大陆坡地形上急流的行为及其对北流的可能应用
DOI：
10.1175/jpo2705.1
复制
发表时间：
2005
影响因子：
3.5
通讯作者：
R. Trieling
中科院分区：
文献类型：
--
作者：
M. Flexas;V. Heijst;R. Trieling
北流是地中海西北部的一种斜坡流，具有较高的中尺度变率，通常与曲流和涡的形成有关。本文采用该洋流的正压实验室模型来研究海底地形对洋流变率的作用。为了达到这个目的，在一个放置在转台上的圆柱形槽中设置源-汇装置来产生轴对称正压电流。为了研究无粘地形效应，在地形坡度和定深设置上进行了实验，后者被用作前者的参考。为了全面了解涡度平衡的作用，流可能被迫在方位角方向上，导致“向西”的前进流（类似于北流）或“向东”的逆行流。对于慢流，东流和西流表现出相似的模式，以开尔文-亥姆霍兹型不稳定性为主。对于高速流…
Abstract The Northern Current is a slope current in the northwest Mediterranean that shows high mesoscale variability, generally associated with meander and eddy formation. A barotropic laboratory model of this current is used here to study the role of the bottom topography on the current variability. For this purpose, a source–sink setup in a cylindrical tank placed on a rotating table is used to generate an axisymmetric barotropic current. To study inviscid topographic effects, experiments are performed over a topographic slope and also over a constant-depth setup, the latter being used as a reference for the former. With the aim of obtaining a fully comprehensive view of the vorticity balance at play, the flow may be forced in either azimuthal direction, leading to a “westward” prograde current (similar to the Northern Current) or an “eastward” retrograde current. For slow flows, eastward and westward currents showed similar patterns, dominated by Kelvin–Helmholtz-type instabilities. For high-speed flo...