北大西洋海表面温度（SST）多年代际振荡（统称为AMO）不仅影响大西洋周边气候和全球平均温度，而且对亚洲（包含中国）气候变化有重要影响。虽然观测SST相对比较完整，但对于分辨AMO仍显不足，因为观测SST长度从1850-现在，不到170年。而且观测SST数据既包含人类活动引起全球变暖信号也包含AMO等内部变率。观测数据不足引起了研究者对AMO本质来源激烈争论。为了更好认清AMO的机制，本项目设计数值试验，结合现有观测和再分析资料，针对AMO定义，AMO不同时间尺度，AMO与其他海盆间变率联系，AMO与大西洋经圈翻转环流（AMOC）关系等展开，探讨AMO的来源及其AMOC在AMO演变中扮演的作用。

The Atlantic Multi-decadal Oscillation (AMO) in sea surface temperature (SST) not only impacts the climate around the North Atlantic and global mean SST, but also exerts far-reaching climate influence in the Asia (including China). Although the SST record is relative complete, there is the deficiency to resolve AMO due to short length during 1850-present (~170 years). SST data include global warming due to anthropogenic forcing and the internal variability, such as AMO. Because of the deficiency of observed data, researchers have a heated debate on the nature of AMO. For clarifying the mechanism of AMO, the project will focus on the AMO’s origin and role of Atlantic meridional overturning circulation (AMOC) by studying the AMO definition, different time scales variability existing AMO, the cross-basin connection related to AMO, the link between AMO and AMOC with the aide of designing the numerical simulations, the observation and reanalysis data.