热带偶极型对流活动与东亚夏季风的联系

采用１９７９～１９９４年ＮＣＥＰ／ＮＣＡＲ再分析风场资料和ＯＬＲ资料，研究了热带对流的变化特征，讨论了热带对流年际变化与东亚夏季风的关联。指出：夏季热带对流存在以西太平洋暖池附近和赤道中太平洋附近中心的年际变化方差大值区，且这两个中心的充变化呈偶极型反位相振荡，这种偶极型对流活动与东亚夏季风有密切关系。当暖池附近对流偏强（弱），赤道中太平洋附近对流偏弱（强）时，东亚夏季风偏强（弱），雨带偏北（南）

RELATIONSHIP BETWEEN THE DIPOLE TROPICAL CONVECTIVE ACTIVITIES AND EAST ASIAN SUMMER MONSOON

In terms of 1979~1994 NCEP/NCAR re analyses and OLR data,the variation characteristics of tropical convective activities are investigated and the relationships between the interannual variation of summer OLR and East Asian summer monsoon(EASM) are discussed.It is found that the interannual variation of summer OLR is remarkable in warm pool and the equatorial central Pacific,which is in anti phase oscillation. When the convective activities are strong(weak) in warm pool and weak(strong) in the equatorial central Pacific, the EASM is strong(weak) and the rainbelt is north(south) of its mean position with less(more) precipitation in the Yangtze River reaches.Further evidences show that the atmospheric circulation anomaly in subtropical Asia(tropical Pacific) relative to the dipole tropical convective activities is vertically barotropic(baroclinic).