欧亚大陆大型斜脊的形成和维持是我国大范围持续性极端低温事件的一个重要原因。欧亚大陆大型斜脊是与阻塞高压既有联系，但在形态、结构以及时间和空间尺度上都不同的一类环流系统。本项目在中期-延伸期时间尺度上，总结不同类别欧亚大陆大型斜脊的生命史特征及其对我国冬季持续性大型冷空气活动的影响；拟从阻塞高压活动的整体分布、高频瞬变波的反馈强迫以及低频Rossby波的能量频散过程等角度切入，深入研究欧亚大陆大型斜脊形成和维持的物理机理；建立一个欧亚大陆大型斜脊及其影响的概念模型，为我国冬季大范围持续性低温事件的中期-延伸期预报提供思路和依据。 关键词：欧亚大陆大型斜脊，阻塞高压，Rossby波，瞬变涡动，低温事件

The formation and maintenance of the large-scale tilted ridge over Eurasia is a caussative factor of the extensive and persistent extreme cold event in China. the large-scale tilted ridge over Eurasia has a close relationship with the blocking, but its shape, structure, and spatial and time scales are distinct from those of blocking. On the medium- and extended time scale, this study tries to summarize its typical features of life cycle and its influence on the wintertime persistent large-scale cold air activity over China; This study aims to investigate the formation and maintenance mechanism of the large-scale tilted ridge over Eurasia in depth, in terms of the distribution of the blocking activities, transient eddy feedback forcing and the energy dispersion process of the low-frequency Rossby waves; This project also constructs a conceptual model of the large-scale tilted ridge over Eurasia and its influences, and it is supposed to give clues and evidences to the medium- and extended scale weather forecast of the wintertime extensive and persistent low temperature event in China. Key words: Large-scale tilted ridge over Eurasia, Blocking, Rossby wave, Transient eddy, Cold event