摘要
对以前提出的热带海气相互作用模式［１］风应力的参数化作了改进。和以前一样，在这个耦合模式中，滤去了大气和海洋中的重力惯性波，只保留了向西传播的Ｒｏｓｓｂｙ波。但经过海气相互作用后，理论分析指出，在耦合模式中存在着快的和慢的两类波动。快波频率的实部、即其相速度是向西传的，并接近于未经海气相互作用时大气中Ｒｏｓｓｂｙ波的频率；而慢波的性质和以前的结果类似，短波部分是向西传的，长波部分向东传，东传波的临界波数随海气相互作用增强向短波部分位移。与以前结果不同的是，除一个慢波不稳定增长外，另一个快波在长波部分也是不稳定增长的。海气相互作用越强，不稳定增长率和不稳定波所出现的波段范围越大。另外，本文的研究结果还指出，高频和低频不稳定波产生的物理条件是不一样的。
n improvement on the parametrization of wind stress is made to the tropical air-sea interaction model formerly proposed by Chao and Zhang. In this air-sea coupled model, the inertial-gravity waves are filtered out and only the equatorial Rossby waves are reserved in both the atmosphere and the ocean. Results indicate that after the air-sea interaction, two kinds of waves appear in the coupled model, one is of high-frequency and another is of lowfrequency. The properties of the low-frequency waves are similar to those in Ref. [1]. The different results from those in Ref. [1] are that besides the low-frequency unstable waves,the high-frequency waves are unstable in the scope of comparatively long wavelengths. The stronger the air-sea interaction. the larger the amplifying rate and wider the scope in which the unstable high-frequency waves appear. This paper also proves that the physical conditions for the producing of the low-frequency and high-frequency unstable waves are different.
出处
《气象学报》
CSCD
北大核心
1994年第3期350-358,共9页
Acta Meteorologica Sinica
