摘要
本文根据低纬热带大气中的风压场平衡关系对CISK-Rossby波进行了研究,指出对于弱对流加热,CISK-Rossby波既可以向东西方向传播,又可以向南北方向传播,并且这种弱对流加热所激发的CISK-Rossby波是一种稳定的减幅波;对于强对流加热,这种CISK-Rossby波减速并向东和向北传播,其传播特征与30～60天低频振荡的特征比较一致,并且这种CISK-Rossby波又是一种不稳定的增幅波,在10°N和17°N地区,经向波长为6000km的CISK-Rossby波的e倍增幅时间分别为6天和8天。因此,CISK-Rossby波可能是30～60天低频振荡的触发机制。
In this paper,Rossby wave-CISK near the equator is investigated according to the wind-pressure field balance relation. It is found that Rossby wave-CISK modes not only propagate in the west-east direction,but also in the north-south direction for the weak cumulus convective heating and the modes are a kind of decayed waves; For the strong convective heating,Rossby wave-CISK modes propagate slowly eastward and northward respectively , which characters are in a good agreement with the properties of 30-60 day Low frequency oscillations. This shows that Rossby wove-CISK may be a possible mechanism for exciting 30-60 low frequency oscillations in the tropical atmosphere.
出处
《成都信息工程学院学报》
1993年第4期33-39,共7页
Journal of Chengdu University of Information Technology
