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《Plateau Meteorology》 2008-S1
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Quasi-Biweekly Oscillation of the Subtropical Summer Monsoon Rainfall over East China and Its Possible Maintaining Mechanism

ZHAN Rui-fen1,SUN Guo-wu2,ZHAO Bing-kei1,PAN Jing3,KONG Chun-yan4,WEN Min5(1.Laboratory of Typhoon Forecast Technique/Shanghai Typhoon Institute,China Meteorological Adminstration Shanghai 200030,China;2.Lanzhou Institute of Arid Meteorology,China Meteorological Adminstration,Lanzhou 730020,China;3.State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG),Institute of Atmosphere Physics,Chinese Academy of Sciences,Beijing 100029,China;4.Shanghai Climate Center,Shanghai 200030,China;5.Chinese Academy of Meteorological Sciences,China Meteorological Adminstration,Beijing 100081,China)  
This study begins with the definition of the subtropical summer monsoon rainfall(SMR) region over East China by using the daily precipitation data at 740 stations of China during 1958-2007.Based on this definition,the quasi-biweekly oscillation(QBWO) of the SMR is investigated.The results show that a 10~20 d period is obvious and important in the intraseasonal cycle of SMR.Its propagation has characteristics of local oscillation.The related analysis shows that the total SMR has close relationship with its QBWO intensity in interannual time scale.Further,the possible maintaining mechanism of QBWO in the SMR is discussed by using daily NCEP I reanalysis data during 1958-2007.It is found that the QBWO in the SMR is closely related to the convective disturbance over the West Pacific ocean and the low-frequency circulation in the low level triggered by the above convection.The latter moves northwestwards under the unified effect of Rossby wave and the environmental flow,which might be the main reason maintaining the QBWO in the SMR.
【Fund】: 国家自然科学基金项目(40775039 40805040);; 国家重点基础研究发展计划项目(2006CB403600)共同资助
【CateGory Index】: P425.42
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