On the behaviour of outflows with low potential vorticity from a sea strait
On the behaviour of outflows with low potential vorticity from a sea strait
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海峡低位涡流出流的行为
DOI：
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发表时间：
1991
期刊：
影响因子：
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通讯作者：
Atsushi Kubokawa
中科院分区：
文献类型：
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作者：
Atsushi Kubokawa
本文用一个简单的准地转模式研究了浅层海面海峡流出物的行为。假设流出流具有两个分段均匀的位涡，较高的位涡与公海中的位涡相同。结果表明，这种简单的模型可以再现与连接日本海和北太平洋的津加鲁海峡附近观测到的相似的环流模式和海岸模式，并在实验室中进行了实验。除了这两种模态外，本模式还可能出现下游水流暂时变宽的海岸模态。这三种模态的存在可归因于下游沿岸流平流低位涡度流体的能力有限以及锋面波的特点。本文还简要分析了流型对流出条件变化的响应。DOI: 10.1034 / j.1600 0870.1991.t01 - 1 - 00007. x
Behaviour of outflows from a sea strait contained in a shallow upper layer is investigated by using a simple quasigeostrophic model. The outflow is assumed to have two piecewise-uniform potential vorticities and the higher one to be the same value as that in the open ocean. It is shown that this simple model can reproduce both the gyre mode and the coastal mode similar to those observed near the Tsugaru Strait, which connects the Sea of Japan with the North Pacific, and in laboratory experiments. In addition to these two modes, a coastal mode in which the current at the downstream temporally widens can also occur in the present model. The existence of these three modes can be attributed to the limited capacity of the downstream coastal current to advect the low potential vorticity fluid and the characteristics of frontal waves. The responses of the flow pattern to the changes in the outflow conditions are also briefly examined. DOI: 10.1034/j.1600-0870.1991.t01-1-00007.x