摘要
利用热带简单耦合海-气模式研究了耦合的Kelvin内模和二阶对称Rossby内模的传播特征、稳定性及其动力学特征结构。结果揭示了热带海-气耦合系统的尺度和频率选择机制。海-气耦合作用主要影响大尺度波动并且具有非均匀性,使得Kelvin内模频率减小和Rossby内模频率增加,甚至激发向东传播的Rossby内模;同时激发Kelvin模的不稳定发展和导致Rossby模的衰减。大气阻尼效应与海-气耦合作用相反。海洋阻尼效应仅使波振幅衰减。同时揭示了海-气耦合系统的动力学特征结构,指出大气和海洋波动分量之间的位相关系。
The propagation features, stabilities and dynamical characteristic structuresof coupled Kelvin inner modes and second order Rossby inner modes are studied using asimple tropical coupled air-sea model in this paper. It is shown that there is mechanismof selecting scale and frequency in the tropical air-sea system. The effects of air-seacoupling are mainly on the large-scale modes and nonuniform These effects make thefrequency of Kelvinmodes decrease that of Rossby inner modes increase,and even excitethe eastward propagating Rossby inner modes. These effects make the unstable develop-ment of Kelvin modes and result in the decay of Rossbt modes. The effects of atmo-spheric damp are opposite to those of air-sea coupling. The oceanic damp only makesthe wave amplitudes decay Simuitaneously, this paper shows the dynamical characteristicstructures of air-sea coupled system and the phase relationships between the atmo-spheric and oceanic wave component.
出处
《南京气象学院学报》
CSCD
1992年第4期447-458,共12页
Journal of Nanjing Institute of Meteorology
关键词
热带
海气
数值模式
tropics
air--sea system
numerical model
model feature
