The impact of the Atlantic Multi-decadal Oscillation (AMO) on the ENSO amplitude was investigated through observational analyses. During the past 90 years the interdecadal variability of ENSO intensity is significantly correlated with the AMO. ENSO variability was strengthened (weakened) during a negative (positive) AMO phase. An ocean mixed layer heat budget analysis reveals that the thermocline feedback is the main process regulating AMO negative phase dependent ENSO growth characteristic. A further examination indicates that a strengthened atmospheric response to unit SST anomaly, an enhanced thermocline response to unit wind stress forcing and a strengthened subsurface temperature response to unit thermocline variation all contribute to the enhanced thermocline feedback during the negative phase of AMO. Such changes are attributed to the increase of background moisture, the weakening of mean subtropical cell (STC) and increase of upper ocean vertical temperature gradient respectively.

通过观测分析研究了大西洋多年代际涛动（AMO）对ENSO振幅的影响。在过去的90年中，ENSO强度的年代际变化与AMO显着相关。在负（正）AMO阶段，ENSO变异性增强（减弱）。海洋混合层热收支分析表明，温跃层反馈是调节AMO负相依赖性ENSO生长特征的主要过程。进一步的检查表明，大气对单元SST异常的响应增强，热跃层对单元风应力强迫的响应增强以及地下温度对热跃层变化的响应增强，都有助于在AMO负相期间增强热跃层的反馈。