Potential vorticity sources and sinks in a quasi-geostrophic Ocean : beyond western boundary currents
Potential vorticity sources and sinks in a quasi-geostrophic Ocean : beyond western boundary currents
复制标题
准地转海洋中的潜在涡量源和涡量汇：超出西边界流
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
S. Riser
中科院分区：
文献类型：
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作者：
M. Lozier;S. Riser
摘要本文研究了准地转涡分辨环流模式（EGCM）的位涡动力学，以确定中尺度变率对风驱动海洋位涡分布的影响。这项研究采用欧拉和拉格朗日分析的努力来描述位涡增益/损失周期沿着路径的粒子。虽然平均风应力旋度是上层内部的主要位涡源，但涡动位涡的重新分布为下层的多个涡旋创造了位涡源。这种再分布是由于当地产生的涡通过斜压不稳定。这些涡是平流的西边界流到中纬度急流，在那里他们是负责交叉环流位涡交换。这种交换集中在向东急流的入口处，南北边界流交汇处。从...
Abstract Potential vorticity dynamics for a quasi-geostrophic eddy-resolving general circulation model (EGCM) are studied in order to determine the effects of mesoscale variability on the potential vorticity distribution of a wind-driven ocean. The study employs both Eulerian and Lagrangian analyses in the effort to describe the potential vorticity gain/loss cycle along the path of a particle. While the mean wind stress curl is the dominant potential vorticity source for the interior of the upper layer, a redistribution of eddy potential vorticity creates sources of potential vorticity for the multiple gyres in the lower layers. This redistribution is a result of the local generation of eddies via baroclinic instabilities. These eddies are advected by the western boundary current into the midlatitude jet where they are responsible for a cross-gyre potential vorticity exchange. This exchange is concentrated at the entrance to the eastward jets where northward and southward boundary currents converge. From ...