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A Typical Mode of Seasonal Circulation Transition: A Climatic View of the Abrupt Transition from Drought to Flood over the Middle and Lower Reaches of the Yangtze River Valley in the Late Spring and Early Summer of 2011

查看全文 作　　者：ZONG Hai-[1]Feng;BUEH [2]Cholaw;CHEN Lie-[1]Ting;JI Li-[2]Ren;WEI [1]Jie 高影响力作者 机构地区：[1]Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;[2]State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China高影响力机构 出　　处：《Atmospheric and Oceanic Science Letters》索引2012年第5卷第5期,共6页高影响力期刊 基　　金：supported by the National Basic Research Program of China (Grant No.2009CB421401);the National Key Technologies R&D Program of China (Grant No. 2009BAC51B02);the National Natural Science Foundation of China (Grant No. 40975022);the Special Scien-tific Research Fund of the Meteorological Public Welfare Profession of China (Grant No. GYHY200906018) 摘　　要：In this study, the seasonal transition of precipitation over the middle and lower reaches of the Yang-tze River Valley (YRV) from late spring to early summer is investigated. The results show that the seasonal transition of precipitation exhibits multi-modes. One of these modes is characterized by an abrupt transition from drought to flood (ATDF) over the middle and lower reaches of the YRV in the seasonal transition of precipitation. It is shown that the ATDF event from May to June 2011 is simply one prominent case of the ATDF mode. The ATDF mode exhibits an obvious decadal variability. The mode has occurred more frequently since 1979, and its amplitude has apparently strengthened since 1994. From the climatic view, the ATDF mode configures a typical seasonal circulation transition from winter to summer, for which the winter circulations are prolonged, and the summer circulations with the rainy season are built up early over the YRV. 关 键 词：初夏干旱 季节转换 长江流域 中下游 气候 洪水 型模 流转
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