黄河流域夏季降水与亚州季风的关系

利用1951-2009年600、850hPa 2.5°×2.5°NCEP/NCAR再分析资料和中国气象局整编的160站的降水资料,计算和分析了反映亚洲地区各个季风特征的指数序列及年代际变化。结果表明:夏季黄河流域降水与印度季风和高原季风关系密切,而与西北太平洋季风的关系不显著;印度季风偏强的年份,黄河流域降水偏多,而在印度季风偏弱的年份,黄河流域降水偏少;近59年来,印度季风指数与黄河流域降水同样具有2～3年、9～10年和21～22年的周期变化。

Impact of the variation of Asian summer monsoon on summer precipitation in Yellow River valley

Based on reanalysis data of 600hPa and 2.5°×2.5°NCEP/NCAR for period and the precipitation data from the National Meteorological Center from 1951 to 2009,the height field index series indicating each summer monsoon in Asia were calculated and the decadal change of the index was analyzed.The results showed that there was close relation between the summer precipitation in the Yellow River valley and Indian summer monsoon and Plateau monsoon,but the relation between the summer precipitation in the Yellow River valley and north west pacific monsoon was not significant.In the years with strong Indian summer monsoon,there was more summer precipitation in the Yellow River valley,and vice versa.In recent 59 years,Indian summer monsoon and the summer precipitation in the Yellow River valley had same cycle of inter-annual and inter-decadal oscillations as 2-3a,9~10a,and 11-22a.