Organization of near‐inertial energy by an eddy field
Organization of near‐inertial energy by an eddy field
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DOI：
10.1256/qj.02.231
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发表时间：
2004-04
影响因子：
8.9
通讯作者：
P. Klein;S. L. Smith;G. Lapeyre
中科院分区：
文献类型：
--
作者：
P. Klein;S. L. Smith;G. Lapeyre
本文给出了海洋中尺度涡旋场作用下风动惯量能量空间变异性演化的解析解。解只需要知道涡流场的流函数和与近惯性振荡相关的简正波的Rossby半径。结果还表明，当涡度谱的斜率小于k−4时，惯性能被捕获在涡量场的拉普拉斯为正且尺寸与随时间增加的临界长度尺度相匹配的结构中。使用不同模型的数值模拟，包括一个完全非线性的浅水模型，证实了分析结果。版权所有(C)2004皇家气象学会。
We propose an analytical solution for the evolution of the spatial variability of wind‐forced inertial energy in the presence of an oceanic mesoscale eddy field. The solution requires knowledge of only the stream function of the eddy field and the Rossby radii of the normal modes associated with the near‐inertial oscillations. It also shows that, when the vorticity spectrum slope is shallower than k−4, inertial energy is trapped inside structures in which the Laplacian of the vorticity field is positive and whose size matches a critical length‐scale that increases with time. Numerical simulations using different models, including a fully nonlinear shallow‐water model, confirm the analytical results. Copyright © 2004 Royal Meteorological Society.