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Impact of the variation of westerly jets over East Asia on precipitation of eastern China in July

查看全文 作　　者：LiNa [1,2]Dong;PinWen [1,2]Guo;PengXiang [3]Wang;Li [1,2]Qi 高影响力作者 机构地区：[1]Key Laboratory of Meteorological Disaster of Ministry of Education, Nanjing 210044, China;[2]School of Atmospheric Sciences, NUIST, Nanjing 210044, China;[3]Institute of Arid Meteorology, CMA, Lanzhou; Key Laboratory of Arid Climatic Change and Reducing Disaster of Gansu Province; Key Open Laboratory of Arid Climate Change and Disaster Reduction of CMA, Lanzhou, Gansu 730000, China高影响力机构 出　　处：《Research in Cold and Arid Regions》索引2011年第3卷第5期,共11页高影响力期刊 基　　金：supported by the National Natural Science Foundation of China (Grant No.40675041) 摘　　要：The impact of the northward jump and westward movement of the East Asian westerly jet core from the western Pacific Ocean to the Qinghai-Tibet Plateau on precipitation distribution of eastern China is studied. It is concluded that on the one hand, the northward jump of the jet causes the precipitation belt to move northward from the middle and lower reaches of the Yangtze River valley and withdraw during the Mei-yu season; on the other hand, the westward movement of the jet core has no correspondence with withdrawal of the Mei-yu season. However, the earlier or later occurrence of the westward movement of the jet has an influence on the process of the rain belt moving northward than the northward jump of the jet: the rain belt moves northward from the middle-lower Yangtze River valley to the Huaihe River and then to an area between the Yellow River and Huaihe River during years when the time of the westward movement of the jet core is later than that of the northward jump of the jet and from the middle-lower Yangtze River valley to an area between the Yellow River and Huaihe River in other years. Further analysis shows that: (1) The northward jump of the jet and the westward movement of the East Asian westerly jet core causes significant variation of the general atmospheric circulation in middle latitudes and water vapor transport from the western Pacific, but not from the Bay of Bengal. (2) Impact of the northward jump and the westward movement of the East Asian westerly jet core on circulation are different, therefore, water vapor transport from the western Pacific and its impact on the rain belt are different. The earlier or later occurrence of the westward movement of the jet core than the northward jump of the jet causes the process of circulation and water vapor transport to be different which produces a different process of the rain belt moving northward. 关 键 词：西风急流 中国东部 降水分布 东亚 西太平洋地区 中下游流域 飞机 长江流域
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