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《Chinese Journal of Geophysics》 2010-10
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Leading spatial patterns of summer rainfall quasi-biennial oscillation and characteristics of meteorological backgrounds over eastern China

JIA Jian-Ying~1,WANG Yong~(2,3),SUN Zhao-Bo~1,LIU Yi~2,CHEN Hai-Shan~1 1 Key Laboratory of Meteorological Disaster of Ministry of Education (KLME) & Department of Atmospheric Sciences, Nanjing University of Information Science and Technology,Nanjing 210044,China 2 Key Laboratory of Middle Atmosphere and Global Environment Observation (LAGEO),Institute of Atmospheric Physics, Chinese Academy of Sciences,Beijing 100029,China 3 Graduate University of Chiriese Academy of Sciences,Beijing 100049,China  
In virtue of empirical orthogonal function (EOF) analysis and correlation analysis etc., the leading spatial patterns of summer rainfall quasi-biennial oscillation ( TBO) and the meteorological backgrounds are analyzed using monthly mean rainfall of China from 160 stations during the year of 1951~2005 from China Meteorological Administration and NCEP/NCAP reanalysis datasets.The following are main results: (1) The seasonal variation of rainfall is significant over China and summer is the main stage of rainfall.Summer rainfall has noticeable tropospheric quasi-biennial oscillation (TBO) character and the eastern China has the maximum rainfall TBO variance.(2) The summer rainfall TBO has two leading EOF spatial modes over eastern China, the first mode reflects the reverse phase of rainfall evolution between south and north of 27°N and the rainfall amplitude is relatively larger than the second mode.The max value center of the second mode located at Hetao and North China.(3)The meteorological backgrounds that form the two modes are different.The first mode has positive correlation with west Pacific sea surface temperature anomaly (SSTA) and negative correlation with east Pacific SSTA while the second mode has positive correlation with Japanese sea SSTA.When the summer rainfall TBO increased at Yangtze-Huaihe river valley (the first mode), the west Pacific SST is higher and the east Pacific SST is lower than normal period, 850 hPa has an anticyclone anomaly over eastern China and along the coast, the correlation field between the first model and 500 hPa height anomaly presents'+-+'pattern over east Asia, the south Asia anticyclone strengthens at 200 hPa and the position of the west jet moves south.When the position of summer rainfall TBO moves north (the second mode), 850 hPa has an cyclone anomaly over eastern China and along the coast, the south Asia anticyclone weakens at 200 hPa and the position of the west jet moves north.
【Fund】: 气象灾害省部共建教育部重点实验室(南京信息工程大学)开放课题(KLME0903);; 江苏省气象灾害重点实验室项目(KLME050104);; 江苏省“六大人才高峰”计划资助项目;; 科技部基础性工作专项重点项目(2007FY110700)资助
【CateGory Index】: P426.6
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