结合观测资料诊断分析和数值试验，分析北半球冬季北极涛动正负位相异常情况下，对热带印度洋偶极子型模态的可能触发及调制过程和机理。重点研究内容涉及三个方面，一是北极涛动触发热带印度洋海洋Rossby波的过程及其传播，以及ENSO不同位相情况下Rossby波活动特征的影响；二是相应的热带印度洋混合层温度的变化，考虑混合层温度倾向方程各项的作用，定量分析海洋动力过程、以及表面热通量各子项的贡献；三是研究关键海洋及大气反馈过程，明确ENSO和非ENSO背景下，北极涛动导致夏秋季海气系统异常偶极子型的反馈过程以及其相对重要性。

This proposal aims to study the interannual relationship between the boreal winter Arctic Oscillation and Indian Ocean Dipole mode by employing observation and numerical simulation data. There are three major topics to be analyzed. First, try to answer to how does the winter Arctic Oscillation trigger the off-equatorial oceanic Rossby waves. To unravel the the features of the Rossby wave activity, including its location and time of generation as well as its propagation. Particularly, to answer how the Rossby wave change under different ENSO conditions. Second, to analyze the changes of temperature tendency of the mixed layer over the tropical Indian Ocean in the context of Arctic Oscillation-Indian Ocean connection. Attention should be paid to the oceanic dynamical processes and the surface fluxes, and their contribution to the sea surface temperature tendency. Third, to analyze the key feedbacks in ocean and atmosphere systems/subsystems, make sure which ones play dominant roles involving the dipole mode anomalies of the coupling tropical air-sea under conditions of interfering with ENSO/non-ENSO forcings.