摘要
从海气相互作用的观点出发研究了热带大气季节内振荡产生的一种可能原因,发现在不考虑大气内部大尺度凝结反馈过程的条件下,线性简单海气耦合系统在真实的参数取值范围内存在一类和实际观测类似的季节内振荡模态,这种模态可以不稳定缓慢东传或西传或表现为驻波,海洋边界波反射效应对这种振荡模态的形成无根本性影响。这一结果为解释洋面上观测到的热带大气低频振荡的局地特征提供了理论背景。
Air - sea interaction as a possible origin of intraseasonal oscillation in the tropical atmosphere was studied by using a simple coupled air - sea interaction model. It is found that with no consideration of the atmospheric internal feedback processes such as the Wave - CISK modes there still exist an intraseasonal oscillation mode in the linear air - sea interaction system within the realistic range of parameters, and the mode can slowly propagate eastward or westward, or can be quasi - stationary, when coupling coefficient is changed. It is also found that the effect of wave reflection at the longitudinal boundaries does not play an important role in sustaining formation of the intraseasonal oscillation mode. The studies may provide a theoretical background for explaining the local features of atmospheric low - frequency oscillation observed over the tropical ocean.
出处
《热带气象学报》
CSCD
1993年第3期202-210,共9页
Journal of Tropical Meteorology
关键词
海气
相互作用
耦合波
季节
内振荡
Air - sea interaction Coupling waves Intraseasonal oscillation
