Spin-down and the dynamics of dense pool gyres in shallow seas
Spin-down and the dynamics of dense pool gyres in shallow seas
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DOI：
10.1357/0022240963213538
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发表时间：
1996-05
影响因子：
0.5
通讯作者：
A. E. Hill
中科院分区：
文献类型：
--
作者：
A. E. Hill
在许多陆架海中发现了密集（通常是冷的）底层水的孤立透镜体或穹状体，可以预期它们会引起显著的斜压环流。然而，只要它们有正确的热风切变，许多流动状态可以支持底部圆顶结构，包括：（a）由静态表面层覆盖的反气旋循环密集圆顶或（B）围绕静态圆顶的气旋表面流。一个一维的，两层，准地转模式适用于高斯涡旋认为，在陆架海的底部摩擦的帐户，底层将旋转下来，在短短几天的时间尺度休息，由于层耦合通过涡拉伸/压缩，气旋流将集中在表层。气旋表面流与静态，密集的圆顶在浅海的协会是由坦克实验的报告和最近的观察在爱尔兰海的冷池系统的支持。
Isolated lenses or domes of dense (often cold) bottom water are found in many shelf seas and can be expected to induce significant baroclinic circulations. However, provided they have the correct thermal wind shear, many flow states can support a bottom dome structure, including: (a) an anticyclonically circulating dense dome overlain by a static surface layer or (b) cyclonic surface flow around a static dome. A one-dimensional, two-layer, quasi-geostrophic model is applied to a Gaussian vortex to argue that, on account of bottom friction in shelf seas, the bottom layer will spin down to rest over a time-scale of just a few days and that, due to layer coupling through vortex stretching/compression, cyclonic flow will concentrate in the surface layer. The association of cyclonic surface flow with static, dense domes in shallow seas is supported by reports of tank experiments and by recent observations in a cold pool system in the Irish Sea.