亚洲季风与ENSO循环的相互作用

ＥＮＳＯ事件对亚洲季风有很大影响，特别是对东亚夏季风环流有较大影响。许多观测事实表明，在ＥＮＳＯ事件处于发展阶段的夏季，江淮流域往往发生洪涝，黄河流域往往发生干旱，东北地区往往发生冷夏。本研究利用观测资料分析了亚洲季风对ＥＮＳＯ事件发生的影响。分析结果表明，在ＥＮＳＯ事件发生前，在热带太平洋上空对流层下层有明显的西风异常；这个西风异常将会加强东传暖Ｋｅｌｖｉｎ波和西传冷Ｒｏｓｓｂｙ波，为ＥＮＳＯ循环提供必要的赤道海洋波动条件；并且这个西风异常与东亚季风区西风异常向南传播有密切关系。通过遥相关分析表明，东亚季风西风异常的南传是通过欧亚型遥相关的波列来实现。通过分析，本研究提出一种亚洲季风与ＥＮＳＯ循环相互作用的物理图像。

Asian Monsoon and ENSO Cycle Interaction

ENSO event has a large influence on Asian monsoon,particularly on the East Asian monsoon. Many observational facts show that during the summers with the developing stage of ENSO event, flood used to occur in the Yangtze River and the Huaihe River basin, drought used to occur in the Yellow River basin and cooling summers used to occur in Northeast China. In this investigation,the observed data are used to analyse the influence of Asian monsoon on the occurrence of ENSO event.The analysed results show that before the occurrence the tropical Pacific.The westerly anomalies can intensify the eastward-propagating warm Kelvin waves and the westward-propagating cold Rossby waves and provide the necessary condition of oceanic waves for ENSO cycle.Moreover, these westerly anomalies are closely assciated with the southward propagation of the westerly anomalies from the East Asian monsoon region. By through the teleconnection analyses, it is shown that the southward propagation of the westerly anomalies from the East Asian monsoon region is realized by through the wave train of EU teleconnection pattern. By the analyses,a physical illustration of Asian monsoon and ENSO cycle interaction is proposed in this study.