太平洋和大西洋年代际模态间的跨洋盆作用对频率和位相的依赖性研究

太平洋年代际变率（IPV）和大西洋多年代际变率（AMV）对全球气候有广泛的影响。最近的研究表明这两个模态可通过激发大气桥调制对方的变化。以往研究发现IPV和AMV在不同频率或不同（正、负）位相上显示出不同的变化特征，并产生不同的气候影响。但频率和位相如何影响IPV和AMV之间的调制作用尚不清楚，这限制了我们对这一重要的跨洋盆作用机理的认识。本项目拟使用观测、再分析资料和模式数据，系统研究：1）IPV和AMV哪一个主导各频率的跨洋盆作用？2）IPV和AMV在各自正、负位相上引起的跨洋盆作用的不对称性。本项目将增进我们对这一跨洋盆作用的认知，为提升模式模拟和预测IPV和AMV的能力提供理论基础。

Interdecadal Pacific variability (IPV) and Atlantic multidecadal variability (AMV) exhibit broad influences on global climate. Recent studies showed that the two modes can modulate each other by triggering atmospheric bridges. Previous studies found that the IPV and AMV show different features and different climate influences on different frequencies or in different (positive and negative) phases. But how frequencies and phases influence the modulations between the IPV and AMV remain unclear, which limits our understanding on the mechanisms of this important trans-basin modulation. This project plans to use observations, reanalysis data and numerical experiments to systematically study: 1) which one of the IPV and AMV dominates the trans-basin effect on different frequencies? 2) asymmetries of the trans-basin effect leading by the IPV and AMV in their different phases. This project will improve our understanding on this trans-basin effect and provide the theoretical basis for improving model simulation and prediction of the IPV and AMV.