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运用 Mc Creary和 Yu(1992 )的非线性 2 12 层模式的积分流场 ,研究了混沌混合与输运对海水及要素浓度的输运和混合问题。模式结果显示混沌混合区主要分布于赤道东太平洋不稳定区及东、西边界附近 ,中西太平洋的大部分区域为非混沌区。释放在混沌区内的示踪团随时间的弥散过程要较非混沌区内的示踪团复杂的多。因多模态不稳定波动的共同作用 ,尤其是在赤道上经向运动最强的 Yanai波的加入 ,使得赤道不稳定区的流体以混沌混合的方式均匀地弥散开 ,趋向于粗粒 (coarse- grained)意义下的均匀化。并有大量释放于赤道东太平洋不稳定区的示踪质点越过赤道进入对面半球。背景辐散流的加入能将部分示踪点输送出混合区使其不加入均匀化过程 ,故最后混入另一半球的质点数少于半数。过赤道交换速率则主要由混沌混合的强度有关。
Using the integral flow fields of nonlinear 2 12-layer model of Mc Creary and Yu (1992), the transport and mixing problems of seawater and element concentration by chaos mixing and transport are studied. The results show that the chaotic mixing zone is mainly distributed in the unstable region of the eastern equatorial Pacific and near the eastern and western boundaries, and most of the western and central Pacific region are non-chaotic. The dispersion of the tracer group released in the chaotic region over time is much more complicated than that of the tracer group in the non-chaotic region. Due to the combined effect of multi-modal instability fluctuations, especially the Yanai wave with the strongest meridional motion on the equator, the fluid in the equatorial unstable area is evenly dispersed in a chaotic manner and tends to be coarse - grained. And a large number of tracer particles released in the unstable equatorial eastern Pacific crossed the equator to enter the opposite hemisphere. The addition of background divergent flow can transport some of the tracer points out of the mixing zone so that they do not join the homogenization process, so that less than half of the particles are finally mixed into the other hemisphere. The rate of equatorial exchange is mainly related to the intensity of the chaotic mixture.