热带大气季节内振荡和ENSO的相互关系

通过观测资料的分析和数值模拟，研究了热带大气季节内振荡与ＥＮＳＯ的相互关系．一方面，在Ｅ１Ｎｉｎｏ事件发生之前，热带大气季节内振荡（尤其是在赤道中西太平洋地区）异常偏强，通过海一气相互作用它可能是Ｅ１Ｎｉｎｏ的一种重要激发机制．同时，赤道中西太平洋地区大气季节内振荡的异常加强同东亚中高纬度地区３０-６０天振荡的加强和强东亚冬季风有关．另一方面，ＥＮＳＯ对热带大气季节内振荡也有重要影响，在Ｅ１Ｎｉｎｏ期间，热带大气季节内振荡明显减弱；其结构明显趋于正压性．

RELATIONSHIP BETWEEN INTRASEASONAL OSCILLATION IN THE TROPIOAL ATMOSPHERE AND ENSO

Based on some analyses in the observational data and numerical simulations, the relations and interaction between ENSO and intraseasonal oscillation in the tropical atmosphere are studied and exposed in its paper.There are anomalous strong intraseasonal oscillations in the tropical atmosphere(especially,over the center-western equatorial Pacific area)prior to the E1Nino event.It is probably an important mechanism to excite ENSO through the air-sea interaction.The anomalous strong intraseasonal oscillations over the center-western equatorial Pacific are related to stronger 30-60 day oscillations in the mid-high latitudes over East Asia and stronger winter monsoon. The important influnces of ENSO are also obvious to the intraseasonal oscillation in the tropical atmosphere. During the E1Nino event,the intraseasonal oscilations in the tropical atmosphere are reduced obviouslly and their structure tends to barotropic.