The monthly observed average precipitation data of 160 meteorological stations in China from 1960 to 2007,had been reorganized by the China Meteorological Administration.By employing that precipitation data,NCEP/NCAR ...The monthly observed average precipitation data of 160 meteorological stations in China from 1960 to 2007,had been reorganized by the China Meteorological Administration.By employing that precipitation data,NCEP/NCAR reanalysis data and the index of intensity of western Pacific subtropical high,the seasonal variations of subtropical high and precipitation in eastern China during the past decades are discussed.The relationships between them also are discussed by correlation and composite analyses.The results show that the intensity of subtropical high,which has significantly strengthened in the recent 50 years,especially in spring,autumn and winter,has notable impact on the simultaneous rainfall in the eastern region of China for all seasons,especially in winter.展开更多
采用均生函数方法对1900-1950年中国东部测站降水资料进行补插,通过与英国Climate Research Unit(CRU)的网格点降水资料以及王绍武等(2000)重建的降水资料的对比分析,构造1900-2006年中国东部华北、长江中下游和华南地区的月平均降...采用均生函数方法对1900-1950年中国东部测站降水资料进行补插,通过与英国Climate Research Unit(CRU)的网格点降水资料以及王绍武等(2000)重建的降水资料的对比分析,构造1900-2006年中国东部华北、长江中下游和华南地区的月平均降水指数序列,并用一阶矩突变扫描式t检验对这三个区域降水的多时间尺度跃变特征进行分析。结果表明,最近一百多年来长江中下游降水发生了5次年代际尺度的跃变,华北以及华南的降水均发生了4次年代际尺度的跃变。各区降水同时在20世纪20年代初期、40年代中期、60年代中期以及70年代中期发生跃变。具体而言,20年代初期长江中下游和华南的降水发生年代际减少,而此时华北降水年代际增加;40年代中期,三个地区的降水都同时增加;60年代中期,华北降水减少,相反地长江中下游和华南的降水发生年代际增加;70年代中期,华南和华北地区的降水出现年代际减少,而长江中下游地区的降水在80年代初发生年代际增加。研究还表明,降水跃变发生的时间尺度范围可以为我们预测跃变发生以后降水气候平均态的持续时间提供参考。展开更多
基金Supported by Projects Funded by Scientific Research Special Fund for Public Welfare Industry (GYHY20076029)
文摘The monthly observed average precipitation data of 160 meteorological stations in China from 1960 to 2007,had been reorganized by the China Meteorological Administration.By employing that precipitation data,NCEP/NCAR reanalysis data and the index of intensity of western Pacific subtropical high,the seasonal variations of subtropical high and precipitation in eastern China during the past decades are discussed.The relationships between them also are discussed by correlation and composite analyses.The results show that the intensity of subtropical high,which has significantly strengthened in the recent 50 years,especially in spring,autumn and winter,has notable impact on the simultaneous rainfall in the eastern region of China for all seasons,especially in winter.
文摘采用均生函数方法对1900-1950年中国东部测站降水资料进行补插,通过与英国Climate Research Unit(CRU)的网格点降水资料以及王绍武等(2000)重建的降水资料的对比分析,构造1900-2006年中国东部华北、长江中下游和华南地区的月平均降水指数序列,并用一阶矩突变扫描式t检验对这三个区域降水的多时间尺度跃变特征进行分析。结果表明,最近一百多年来长江中下游降水发生了5次年代际尺度的跃变,华北以及华南的降水均发生了4次年代际尺度的跃变。各区降水同时在20世纪20年代初期、40年代中期、60年代中期以及70年代中期发生跃变。具体而言,20年代初期长江中下游和华南的降水发生年代际减少,而此时华北降水年代际增加;40年代中期,三个地区的降水都同时增加;60年代中期,华北降水减少,相反地长江中下游和华南的降水发生年代际增加;70年代中期,华南和华北地区的降水出现年代际减少,而长江中下游地区的降水在80年代初发生年代际增加。研究还表明,降水跃变发生的时间尺度范围可以为我们预测跃变发生以后降水气候平均态的持续时间提供参考。