摘要
本文建立了一个简单的热带海气耦合模式，模式大气和海洋中包含了Ｋｅｌｖｉｎ波和长Ｒｏｓｓｂｙ波。在赤道平面近似下，讨论了取耦合系统中最大径向模时，即大气和海洋中只存在Ｋｅｌｖｉｎ波时耦合波的性质。结果指出，向东传的耦合Ｋｅｌｖｉｎ波可以出现不稳定性，并且由于海气相互作用，在长波部分可以产生向西传的耦合Ｋｅｌｖｉｎ波。耦合Ｋｅｌｖｉｎ波的性质与模式中所选用的参数有很大关系，当大气与海洋中自由波的频率相差很大时，耦合波的性质与没有海气相互作用时自由波的性质非常接近；只有当大气与海洋中自由波的频率相差不太大时。才可产生强列的海气耦合并出现不稳定性。
According to a simple tropical air-sea interaction model, under the approximation of the equatorial β-plane, the case when the gravest meridional mode is taken in the air-sea coupled system is discussed in this paper. This case corresponds to that there only exists Kelvin wave both in the atmosphere and in the ocean.When the Kelvin wave in the atmosphere and that in the ocean are coupled together,the eastward propagating coupled Kelvin waves can be unstable and in the long wave part, the coupled Kelvin waves can propagate westward because of the air-sea interaction. The property of the coupled Kelvin waves has a great deal to do with the parameters used in the model. When the parameter makes the difference between frequencies of atmospheric Kelvin wave and oceanic one to be very much great,the property of the coupled Kelvin waves is close to that of the Kelvin waves in the atmosphere and in the ocean. Only when there is no much difference between the frequencies of atmospheric Kelvin wave and oceanic one, the strong air-sea interaction can occur and instability appears.
出处
《大气科学》
CSCD
北大核心
1995年第4期455-464,共10页
Chinese Journal of Atmospheric Sciences
基金
中国科学院"八五"重大项目
关键词
海气相互作用
热带地区
耦合波
稳定性
air-sea interaction
coupled Kelvin waves
tropical region.
