论文部分内容阅读
基于在一个连续层化条件下热带海洋波动的弱非线性动力学系统中建立的最低阶 Ｌａｇｒａｎｇｅ余流动力学模型及由此导出的赤道波致Ｌａｇｒａｎｇｅ余流的一般解，导出了混合Ｒｏｓｓｂｙ 惯性重力波第一斜压模态导致的最低阶Ｌａｇｒａｎｇｅ余流的表达式。从中发现，该波可产生纬 向、经向和铅垂方向的Ｌａｇｒａｎｇｅ余流，其中水平分量与赤道中、东太平洋表层流速的年平均值 （约５ｃｍ／ｓ）同量级；纬向和铅垂向余流关于赤道正对称，经向余流关于赤道反对称，在赤道上 为零，因而不会造成跨赤道的质量净输运；余流量值不但与零阶波的振幅平方成正比，与零阶 波的频率也有关系５有振幅变化的混合波所导致的Ｌａｇｒａｎｇ ｅ余流的经向结构与无振幅变化波 致余流不同。定性分析了该波致余流对赤道中、东太平洋环流与ＳＳＴ的影响，初步揭示该余流 的年际变化有利于赤道中、东太平洋 Ｅ１ Ｎｉｎｏ事件的发展。
Based on the lowest Lagrange residual flow dynamics model established in a weakly nonlinear dynamical system of tropical oceanic fluctuations under a continuous stratification condition and the general solution of Lagrange residual flow induced by the equatorial wave, a mixed Rossby inertial gravity wave The expression of the lowest order Lagrange residual flow caused by the first barometric mode. It is found that this wave can produce latitudinal, meridional and vertical Lagrangian residual currents, of which the horizontal component is of the same order of magnitude as the annual average (about 5 cm / s) of the surface velocities in the central and eastern equatorial Pacific. The latitudinal and lead The vertical residual flow is symmetric about the equator, and the meridional residual flow is about zero on the equator for equatorial antisymmetry, so it will not cause a net mass transport across the equator. The residual flow value is not only proportional to the squared amplitude of the zero-order wave, It is also related to the frequency of zeroth-order wave. The warp-directional structure of Lagrang e residual flow caused by the mixed wave with varying amplitude is different from that caused by the non-amplitude wave. The influence of this residual flow on the circulation and SST in the central and eastern equatorial Pacific is qualitatively analyzed. It is shown that the interannual variation of this residual flow is favorable for the development of E1 Nino events in the central and eastern equatorial Pacific.