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arXiv 1202.0360physics.ao-phnlin.CD
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在中尺度涡街道中输送和混合的拉格朗日研究

Lagrangian study of transport and mixing in a mesoscale eddy street

S. V. Prants, M. V. Budyansky, V. I. Ponomarev, M. Yu. Uleysky

摘要:

我们使用动力系统的方法和拉格朗日工具来研究表面运输和混合的水团在选定的沿海地区的日本海移动中尺度涡与Primorskoye电流。拉格朗日轨迹计算大量的粒子在插值速度场产生的数值区域多层涡分辨环流模式。我们计算有限时间的李雅普诺夫指数为一个相对较长的一段时间的方法开发和绘制的李雅普诺夫天气图量化地面运输和混合在该地区。这张地图揭示了沿海地区引人注目的流动结构,具有中尺度涡街和排斥物质线。我们提出了新的拉格朗日诊断工具-退出选定的盒子的粒子的时间,纬向和纬向速度的符号的变化的数量-研究运输和混合的一对强烈相互作用的漩涡经常可见的海表面温度卫星图像在该地区。我们开发了一种技术来跟踪粒子簇,条纹线和材料线的演变。使用的拉格朗日工具,使我们能够揭示中尺度涡旋及其结构,跟踪不同阶段的沿海流,找到不均匀的字符的运输和混合上mesoscales和submesoscales和量化混合的出口时间的值和粒子风的次数在涡流的中心。

英文摘要:

We use dynamical systems approach and Lagrangian tools to study surface transport and mixing of water masses in a selected coastal region of the Japan Sea with moving mesoscale eddies associated with the Primorskoye Current. Lagrangian trajectories are computed for a large number of particles in an interpolated velocity field generated by a numerical regional multi-layer eddy-resolving circulation model. We compute finite-time Lyapunov exponents for a comparatively long period of time by the method developed and plot the Lyapunov synoptic map quantifying surface transport and mixing in that region. This map uncovers the striking flow structures along the coast with a mesoscale eddy street and repelling material lines. We propose new Lagrangian diagnostic tools --- the time of exit of particles off a selected box, the number of changes of the sign of zonal and meridional velocities --- to study transport and mixing by a pair of strongly interacting eddies often visible at sea-surface temperature satellite images in that region. We develop a technique to track evolution of clusters of particles, streaklines and material lines. The Lagrangian tools used allow us to reveal mesoscale eddies and their structure, to track different phases of the coastal flow, to find inhomogeneous character of transport and mixing on mesoscales and submesoscales and to quantify mixing by the values of exit times and the number of times particles wind around the eddy's center.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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