Nonlinear Analysis of Equatorial Eastern Pacific Air-Sea Coupling Oscillation and a Limit-Cycle Theory for ENSO Cycle
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摘要: 把赤道东太平洋地区大气对流层，海洋混合层看作是在定常热源（太阳辐射）驱动下的动力系统，利用一个局域平均的热力学气候模式，建立了海气耦合自激振荡模型，得到了一个封闭的自治的二次系统，对系统进行了线性和非线性分析．结合系统稳定的极限环解，对海气耦合的物理机制进行了探讨．和观测事实的比较表明，在赤道东太平洋区域平均的以500 hPa为代表的大气对流层的温度距平和海表温度距平，在相平面上和极限环解定性上很一致．这为研究热带海气相互作用的年际变化提供了一个理论模型．Abstract: The troposphere and ocean mixed layer were considered as two components of a dynamic system operated by solar radiation as the constant source of energy, where upon an air-sea coupling self-exited coupling oscillation model was based with the aid of a locally averaged thermodynamic climate model, resulting mathematically in a closed self-governed dynamic system, a so-called El Nino-Southern Oscillation(ENSO) system. With the limit cycle solution of the system. It is shown that the essential physics of the coupled system can be described by the ENSO system. Compared with the observations, the theoretical limit cycle orbit mat ches the observed phase loop qualitatively. The ENSO system provides a useful theoretical framework for study of interannual variation of the tropical climate system.
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Key words:
- ENSO /
- limit cycle /
- self-exited oscillation
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