冬季热带印度洋季节内振荡的物理结构

Physical Structure of Madden-Julian Oscillation in the Tropical Indian Ocean During Winter

利用最新的卫星遥感资料、现场观测资料以及海-气通量再分析资料,采用延时相关分析和合成分析方法,分析了冬季热带印度洋季节内振荡的物理结构。结果表明,季节内振荡的结构与原有认识不同,大气深对流中心(短波辐射极小值)和纬向西风极大值(潜热通量极大值)同位相,这种结构有利于海表温度对季节内振荡强迫产生显著的响应,与观测到的热带印度洋海表温度的强季节内变化信号一致,也预示着海-气耦合对于热带印度洋季节内振荡具有重要影响。

Based on the data from remote sensing and in situ observation, and the re-analysis data of air-sea fluxes, lag correlation and composite analysis are used to analyze the physical structure of Madden-Julian oscillation （MJO） in the tropical Indian Ocean during winter. The result differs from the previous resear- ches, and it shows that the center of atmospheric deep convection （i. e. the minimum shortwave radiation） keeps in phase with the maximum zonal wind （i. e. the maximum latent heat flux）. This structure is favourite with the sea surface temperature（SST） response to the intra-seasonal oscillation, being consistent with the observed strong MJO signals of the SST variation in the tropical Indian Ocean. It is suggested that the air-sea interaction would play an important role for the oceanic MJO.