方建刚,白爱娟,肖科丽,田武文.陕西伏旱气候特征及成因分析[J].干旱地区农业研究,2009,27(2):28~34
陕西伏旱气候特征及成因分析
Climatological characteristics of summer drought and its causes in Shaanxi Province
  
DOI：10.7606/j.issn.1000-7601.2009.02.06
中文关键词:  伏旱  气候特征  环流形势
英文关键词:summer drought  climatological characteristics  atmospherical circulation
基金项目:公益性行业(气象)科研专项(GYHY200706029)； 国家重点基础研究发展规划项目(2004CB720208)
作者单位
方建刚 Institute of Earth Environment Chinese Academy of Sciences，Xi’an，Shaanxi 710075，China；Shaanxi Climatic Centre，Xi’an，Shaanxi 710014，China 
白爱娟 Institute of Earth Environment Chinese Academy of Sciences，Xi’an，Shaanxi 710075，China；Shaanxi Meteorological Observatory，Xi’an，Shaanxi 710014，China 
肖科丽 Shaanxi Climatic Centre，Xi’an，Shaanxi 710014，China 
田武文 Shaanxi Climatic Centre，Xi’an，Shaanxi 710014，China 
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中文摘要:
      利用陕西省15个气象观测站1961~2006年78月地面观测资料和美国环境预测中心/国家大气研究中心(NCEP/NCAR)再分析资料,分析了陕西伏旱天气气候特征和典型伏旱期的大气环流特征。结果表明:陕西伏旱具有气温高,降水少,持续时间长,以及明显的年代际变化特征,其中1960、1970和1990年代是伏旱多发时期。强伏旱年西太平洋副热带高压偏弱,青藏高压发展加强并向东北方向移动,与西风带长波脊或西太平洋副热带高压合并,形成控制我国大部分地区的青藏高压或带状高压,是陕西典型伏旱期大气环流的主要特征;100 hPa南亚高压300 hPa高压500 hPa的青藏高压中心位置基本一致,且与对流层上下层的暖中心相对应,是持续性异常伏旱期所具有近似正压结构的典型环流形势。
英文摘要:
      Using the reanalyzed data of NCAR／NCEP and observation data from 15 stations in Shaanxi Province in summertime of June July and August during the time from1961to2006 climatological characteristics of summer droughts and their representative circulations are analyzed．The results show that high temperature little precipitation and obvious decadical variations are the main features of summer drought in Shaanxi. Furthermore most of summer droughts occur in the decades of1960 1970and1990．The atmospherical circulation of serious summer droughts of Shaanxi can be described as the followings．The weaker western Pacific subtropical high the stronger northeast-moving Tibetan high as well as the Tibetan high or the high belt based on the Tibetan high gets united with the long-wave ridge or the western Pacific subtropical high are the typical circulations of Shaanxi summer droughts．Additionally the consist position of southern Asian high at the level of 100hPa the high at the 300 and the Tibetan high at500hPa and its correspondence with the warm center in the whole troposphere are the typical circulations of the persistent and abnormal summer droughts.
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