华南夏季大气水汽汇时空变化特征  

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

作　　者：秦晓昊[1] 高斯[1] 简茂球[1] 乔云亭[1] 肖伟军[2] 

机构地区：[1]中山大学季风与环境研究中心/大气科学系,广东广州510275 [2]广州中心气象台,广东广州510080

出　　处：《广东气象》2007年第3期11-14,共4页Guangdong Meteorology

基　　金：中国气象局气候变化专项(CCSF2006-39);广东省自然基金课题(5003339)资助

摘　　要：用1958～2004年NCEP/NCAR再分析资料,分析华南夏季大尺度大气水汽汇的时空变化特征.结果表明：西南地区东部至华南北部地区、华南沿海地区是我国南方夏季水汽汇的2个主要的变异中心区.西南地区东部至华南北部地区夏季水汽汇具有明显的年代际变化特征.华南南部沿岸地区夏季水汽汇则以年际变化为主.西南地区东部至华南北部附近地区以及华南南部沿岸地区水汽汇的强弱异常变化,与东亚上空水汽输送异常而导致上述地区的垂直积分的水汽通量辐合的异常是密切相关：如果向华北或者长江流域的水汽输送增强（减弱）,则华南地区得到的水汽减少（增加）,导致上述地区上空的水汽汇偏弱（偏强）.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） trans- portation 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.

关 键 词：气候学 大气水汽汇 时空变化特征 经验正交分解(EOF) 华南夏季 

分 类 号：P423.3[天文地球—大气科学及气象学]