二层海洋赤道Kelvin波解析解模态分析

发布时间：2018-02-28 12:24

本文关键词： 二层海洋模型赤道Kelvin波模态分析解析解次表层　出处：《海洋科学进展》2017年03期 　论文类型：期刊论文

【摘要】：采用赤道β平面近似下的线性化二层海洋扰动方程组,对其中的赤道Kelvin波做解析求解,结果表明:该赤道Kelvin波共有2个模态;两者上、下层流场均为东向纬向流,振幅均在赤道处最大,并都呈经向衰减态势,两者波动均是非频散的,这些都与经典Kelvin波相同。第一模态(前者)的相速要比第二模态(后者)大2个量级,后者相速与海洋流速相近。前者是快波模态,后者是慢波模态。前者周期约为半天,后者约为1季度,并具气候意义。前、后者各层流场向高纬的衰减分别表现为缓慢和迅速,后者呈赤道俘获波形态。两模态各层位势场向高纬的衰减同流场。将后者与实际热带印度洋和太平洋的实况及诊断作对比后知,它们具有一致之处。后者能对实际赤道海洋情况以及ENSO现象做出某种解释。
[Abstract]:The equatorial Kelvin wave is analytically solved by using the linearized two-layer ocean disturbance equations in the equatorial 尾 plane approximation. The results show that the equatorial Kelvin wave has two modes and the lower layer current field is both eastward zonal current. The amplitudes are the largest at the equator and show a meridional attenuation trend. Both waves are non-dispersive, which are the same as the classical Kelvin waves. The phase velocity of the first mode (the former) is two orders of magnitude larger than that of the second mode (the latter). The phase velocity of the latter is similar to that of the ocean velocity. The former is a fast wave mode and the latter is a slow wave mode. The former period is about half a day, the latter is about the first quarter, and has climatic significance. Previously, the attenuation of each laminar flow field to the higher latitudes was slow and rapid, respectively. The latter is in the form of an equatorial capture wave. The attenuation of the potential field in each layer of the two modes to high latitudes is the same as the current field. The latter is compared with the actual conditions and diagnoses in the tropical Indian and Pacific oceans. They are consistent. The latter can provide some explanation for the actual equatorial ocean situation and the ENSO phenomenon.
【作者单位】：解放军61741部队;解放军理工大学气象海洋学院大气环流与短期气候预测实验室;
【基金】：国家重点基础研究发展计划项目——西北太平洋海洋多尺度变化过程、机理及可预报性(2013CB956203)
【分类号】：P732

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