A three‑dimensional modeling study on eddy‑mean flow interaction between a Gaussian‑type anticyclonic eddy and Kuroshio
A three‑dimensional modeling study on eddy‑mean flow interaction between a Gaussian‑type anticyclonic eddy and Kuroshio
复制标题
高斯型反气旋涡与黑潮涡平均流相互作用的三维模型研究
DOI：
10.1007/s10872-017-0435-z
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发表时间：
2018
影响因子：
2.3
通讯作者：
王东晓
中科院分区：
文献类型：
--
作者：
耿伍;谢强;陈更新;刘钦燕;王东晓
利用Princeton海洋模式研究了快速反气旋涡旋（AE）与平均流相互作用过程中的能量平衡。AE以轴对称高斯型温度剖面初始化，并放置在菲律宾群岛东部。能量分析表明，平流项、压力功和摩擦项在初始涡动衰减中起主导作用。在强相互作用阶段，正压不稳定性（BTI）成为涡旋动能（EKE）产生的主要动力，在相互作用区的正BTI最大，这意味着在此阶段涡旋始终从黑潮获得动能。在强相互作用阶段，涡动有效位能向涡动动能的大量转换以及平均动能向涡动动能的大量转换都发生在上层。当声发射与黑潮东侧的平均流相互作用时，声发射是从黑潮获得动能还是向黑潮损失动能，主要取决于声发射在相互作用区的形状。
The Princeton ocean model is employed to study the energy balance of a fast-moving anticyclonic eddy (AE) during eddy-mean flow interaction. The AE is initialized with an axisymmetric Gaussian-type temperature profile and is placed to the east of the Philippine Islands. An energy analysis suggests that the advection term, pressure work and friction term play dominant roles in the initial eddy decay. During the strong interaction stage, barotropic instability (BTI) becomes the main force for the eddy kinetic energy (EKE) production, with the largest positive BTI in the interaction zone, which means that the eddy always obtains kinetic energy from the Kuroshio during this stage. Most of the EKE dissipation, the large conversion from the eddy available potential energy to the EKE and that from the mean kinetic energy to the EKE all occur at the upper layer during the strong interaction stage. When the AE interacts with the mean flow on the eastern side of the Kuroshio, whether the AE gains kinetic energy from the Kuroshio or loses kinetic energy to the Kuroshio is mainly determined by its shape in the interaction zone.