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利用NCEP/NCAR再分析资料和NCAR海温资料及中国测站地温资料 ,对ENSO循环不同阶段东亚夏季风强弱变化进行了分析。并从此期间的海陆热力差异和季风低压变化来探讨海温异常对东亚夏季风的影响 ,结果表明 :东亚夏季风指数有明显的年际变化和年代际变化 ,且与赤道东太平洋SST有较好的负相关关系 ,其中又以与三个月前的海温变化关系最好。在Nino1+2区为冷、暖水之后的三个月中 ,冷水期对应的东亚夏季风指数大于暖水期对应的东亚夏季风指数 ,东亚夏季风比暖水期强。赤道东太平洋SST变化期间亚洲大陆的地面温度和地面气压也有明显变化 ,这是引起ENSO不同阶段东亚夏季风变化的主要原因。
Based on the NCEP / NCAR reanalysis data, the NCAR sea temperature data and the geothermal data of China Stations, the changes of the intensity of the East Asian summer monsoon at different stages of the ENSO cycle are analyzed. From the difference between the sea-land heat and the monsoon low-pressure, the influence of SST anomaly on the East Asian summer monsoon was discussed. The results show that the East Asian summer monsoon index has obvious interannual and interdecadal variations, and is quite consistent with the SST over the eastern equatorial Pacific The negative correlation between them, which again with three months ago the best correlation between sea temperature changes. In the three months after Nino1 + 2 area was cold and warm, the East Asian summer monsoon index corresponding to the cold period was larger than the East Asian summer monsoon index corresponding to the warm period, and the East Asian summer monsoon was stronger than the warm period. The surface temperature and surface pressure in the continent of Asia during the SST change in the equatorial Pacific are also obviously changed, which is the main reason for the change of East Asian summer monsoon over the different phases of ENSO.