印度洋偶极子是重要的大气海洋耦合模态，也是调控东亚气候的重要强迫因子。前人虽然广泛的研究了印度洋偶极子与季风系统同时期的相互作用，却较少关注其对于次年夏季降水的迟滞效应。印度洋偶极子正位相时，次年夏季长江-淮河流域降水增加，华南地区降水偏少。本研究拟通过建立印度洋偶极子，冬春青藏高原积雪，夏季降水之间的跨季节联系，揭示印度洋偶极子对次年夏季降水的迟滞效应机理。利用多种统计分析方法，结合后向轨迹分析方法研究印度洋偶极子影响青藏高原积雪分布的动力机制及关键水汽通道。计算大气热源，揭示青藏高原积雪异常如何影响大气热源演变，结合大气环流模式模拟，研究大气环流对冬春青藏高原积雪异常的响应。基于第六轮国际耦合模式比较计划（CMIP6）提供的模式试验结果，对比多模式对于印度洋偶极子模拟技巧，基于高技巧模式分析不同共享社会情景预估试验与历史试验的差异，揭示该跨季节联系对未来气候变化的响应。

The Indian Ocean dipole is an important air-sea coupling mode, which can exert important impacts on the East Asian climate. Although previous studies have extensively studied the simultaneous interaction between the Indian Ocean dipole and the monsoon system, less attention has been paid on its delayed effect on the following year. When the positive Indian Ocean dipole happens in the preceding autumn, the precipitation in the Yangtze-Huaihe River region increases in the ensuing summer, while the precipitation in South China weakens. This study intends to reveal the mechanism of the delayed effect of the Indian Ocean dipole on the precipitation in the following summer by establishing a cross-seasonal relationship between the Indian Ocean dipole, Tibetan Plateau snow, and summer precipitation. By using a variety of statistical analysis methods, combined with backward trajectory analysis methods, HYSPLIT, the mechanism of Indian Ocean dipole's delayed effect will be examined and the prime effected water vapor transportation channels to the Tibetan Plateau can be identified and investigated. By calculating the atmospheric diabatic heat source, how the snow anomaly on the Tibetan Plateau affects the evolution of the atmospheric heat source will be investigated. Using the atmospheric circulation model simulation, the response of the atmospheric circulation to the snow anomaly on the Tibetan Plateau in winter and spring will be examined. Based on the model outputs provided by CMIP6, simulation skills for Indian Ocean dipoles will be analyzed first. Then choosing the high-skill model to compare and discuss the response of the cross-seasonal relationship between the Indian Ocean dipole, Tibetan Plateau snow, and summer precipitation to climate change.