厄尔尼诺（El Nino）是发生在热带太平洋最显著的气候异常信号，与我国夏季降水异常之间存在着复杂的联系。立足于大气降水异常取决于同期下垫面异常物理框架，在解析El Nino与我国夏季降水异常复杂联系的基础上，细化研究不同型El Nino在不同发展阶段对我国夏季降水异常的影响。对于El Nino发展阶段，我们将主要研究El Nino发展当年夏季热带太平洋不同型El Nino对我国夏季降水异常的直接反馈特征及影响机理（这里所谓的直接反馈是指同期下垫面异常对大气降水异常的影响）；而对于衰减阶段，我们将主要研究冬季不同型El Nino次年夏季关键海区海温异常各自对我国夏季降水异常的直接反馈特征及影响机理。希望通过本项目研究，为提高我国夏季降水异常的预测能力、减小预测不确定性提供科学依据。

El Nino is the most prominent climate variability in the tropical Pacific, and but it has an complex relation with our China's summer precipitation anomaly. Based on the framework of summer precipitation anomaly depending on the corresponding time underlying surface anomalies, this study will investigate the direct impact of different type El Nino-related summer SST anomalies on China's summer precipitation at different stages. As to the El Nino developing stage, the direct impact of different type summer-El Nino in the tropical Pacific on the precipitation will be investigated. While for the decaying stage, we will mainly focus on the direct impact of the different type winter El Nino-induced following summer SST anomalies in the other oceans on the precipition. This study could provide a valuable reference for eliminating the uncertainty of the China's summer prcipitation prediction.