Kinematics and Dynamics of a Mediterranean Salt Lens
Kinematics and Dynamics of a Mediterranean Salt Lens
复制标题
地中海盐透镜体的运动学和动力学
DOI：
--
复制
发表时间：
1991
期刊：
影响因子：
--
通讯作者：
T. Rossby
中科院分区：
文献类型：
--
作者：
K. Tokos;T. Rossby
1984年和1985年对北大西洋东部地中海水涡旋（meddy）的绝对速度场进行了两次调查，两次调查相隔一年。两个速度制度被发现。在最大速度半径范围内，漩涡呈反气旋式旋转，在中深度（1000 m），漩涡的旋转周期随深度的变化接近6天。一年后，核心的半径减少了三分之一。透镜的旋转速率也降低，除了在其中间深度处存在小但可察觉的增加。有一个尖锐的（5公里或更少）之间的核心和外部区域的速度随半径呈指数衰减的过渡。一个强的位涡锋，由于水平切变的符号的突变，保持核心与外部区域隔离。在研究期间，在核心的上部范围内的位涡几乎是恒定的，而在下部的位涡有一个显着的增加。
Abstract Two surveys of the absolute velocity field of an eddy of Mediterranean Water (meddy) in the Eastern North Atlantic were conducted one year apart in 1984 and 1985. Two velocity regimes were revealed. Within the radius of maximum velocity, the meddy rotated anticyclonically as a solid body with a depth-dependent rotation period near 6 days at its mid-depth (1000 m). One year later the radius of the core had decreased by one third. The rotation rate of the lens also decreased, except at its mid-depth where there was a small but perceptible increase. There was a sharp (5 km or less) transition between the core and the outer region where the velocity decayed exponentially with radius. A strong potential vorticity front, due to the abrupt change in sign of horizontal shear, kept the core isolated from the outer region. Potential vorticity was nearly constant within the upper confines of the core over the study period, whereas, there was a notable increase in potential vorticity in the lower portion of ...