热带大气季节内振荡研究进展——观测、动力机制和数值模拟

PROCEEDING OF OBSERVATION,DYNAMICS AND NUMERICAL SIMULATION STUDIES ON MADDEN-JULIAN OSCILLATION

热带大气季节内振荡 (MJO)是热带大气活动的强信号。对 MJO动力机制的探讨 ,经历了由考虑完全的大气内部过程 (波动 - CISK理论 ) ,到考虑海洋影响的大气过程 (WISHE理论 ) ,到最新的考虑大气—海洋耦合作用 (WCMC模式 )的逐步发展、完善的阶段。现阶段大气模式能够模拟 MJO的一些基本特征但存在许多缺陷。在大气模式中引入上层海洋的反馈作用 ,可以有效改善模拟 MJO的时空结构。MJO的强度变化、季节特征、传播速度等的精确描述只能借助于海气耦合模式。

The Madden Julian Oscillation (MJO) represents the most significant form of atmospheric variability in the tropics on intraseasonal timescales. Theoretical understandings of the MJO pass through the courses of complete internal process to atmosphere (Wave CISK), the atmospheric process influenced by ocean(WISHE theory) and the most recent coupled atmosphere ocean process(WCMC model). The current atmospheric models are able to capture some of the salient features of MJO while the overall results are not satisfied. The introduction of oceanic feedback to atmospheric model by using of a simplified upper ocean model, however, can improve the MJO simulation in respects to both the strength and the propagation. An accurate representing to MJO can only be available by the using of coupled model.