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Temporal and Spatial Variations of Atmospheric Moisture Sink during Summer in South China

QIN Xiao-hao1,2,GAO S11,JIAN Mao-qiu1,QIAO Yun-ting1,XIAO Wei-jun2(1.The Research Center for Monsoon and Environment /Atmospheric Sciences Department,Sun Yat-sen University, Guangzhou 510275,China;2.Guangzhou Central Meteorological Observatory,Guangzhou 510080,China)  
NCEP/NCAR reanalysis data from 1958 to 2004 were employed to study the characteristics of temporal and spatial variations of atmospheric moisture sink during summer in South China.Results show that the areas from eastern part of South-West China to northern part of South China(ESWC-NSC areas hereafter),and the coastal areas of South China(CSC areas hereafter) turn out to be two major variation centers of moisture sink during summer in South China.Moisture sink during summer in ESWC-NSC areas shows clear interdecadal variations,while interannual variations are the most pronounced in CSC areas.The abnormally strong or weak events of moisture sink in above two areas are closely correlated to abnormal vapor transport over East Asia which causes abnormal vertical integrated vapor flux convergence over those two areas.Stronger(Weaker) transportation of vapor toward North China or Yangtze River valley decreases(increases) the vapor over South China,which causes weaker(stronger) moisture sink over those two areas.
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