跨半球大气遥相关是全球以及区域大气环流变化共同关注的课题。观测表明两个半球大气间相互作用伴随着显著的跨半球大气遥相关型。然而由于早期已有的跨半球大气遥相关型研究资料时间短，关注的时间尺度、垂直高度和物理量场不够全面，跨半球大气遥相关型的时空特征尚不清晰。本项目将利用最新的大气观测资料和多种统计方法，系统考察北半球夏季对流层不同高度、不同低频时间尺度、多个环流变量场上的全球大气遥相关型，确定跨半球大气相关型的存在，并分析其时、空特征和演变规律。结合申请人已有的Rossby波越赤道传播理论基础，进行理论分析和数值试验，考察这些跨半球大气遥相关型与Rossby波穿越东风带传播的关系，明确跨半球能量输送的途径，进而总结出北半球夏季对流层跨半球大气遥相关型分布和维持的动力机制概略图。项目的成功实施将为南、北半球大气相互作用提供新理解和认识，为研究大气遥相关形成和维持机制提供新的基础研究方法。

Interhemispheric teleconnection is a common concern by the communities on global and regional atmospheric circulation. Significant interhemispheric teleconnection has been observed as a part of the Northern Hemisphere-Southern Hemisphere interactions. However, previous studies on this issue are based on short time period, incomplete in timescale, vertical height and circulation variables, and lack the discussions of the dynamic mechanisms. This program intends to investigate the global teleconnectivity on different low-frequency timescale at different levels for several circulation variables during boreal summer using the update long-term data, determine the existence and characteristics of interhemispheric teleconnection patterns. Backed up by the basis of the cross-equatorial propagation theory for Rossby wave, the maintenance mechanisms of these interhemispheric teleconnections will be investigated in terms of the Rossby wave propagation across the tropical easterly theoretically and numerically. As a result, the schematic diagram of the distribution and Rossby wave dynamics of the boreal summer tropospheric interhemispheric teleconnection patterns will be summarized. This program will provide a new understanding of the Northern Hemisphere-Southern Hemisphere interactions, and a new fundamental approach in researching teleconnection mechanisms.