( 3 ) west wind stress anomaly and meridional wind stress anomaly occur in the east of tropic pacific , which can boost the formation of el nino events . the stronger wind stress anomaly , the stronger the corresponding el nino event . when east wind stress anomaly and meridional wind stress anomaly happen the la nina events occur ( 3 )热带太平洋东部伴随着西风应力异常以及向赤道辐合的经向风应力异常，能够有利于驱动elnino事件的形成，而且当风应力异常强则对应的那次elnino事件也偏强；当东风应力异常偏强及经向风应力异常向赤道南北两侧辐散偏强则与lanina事件对应。
4 ) during the meiyu , the precipitation in middle and lower reaches of yangtze river has the relationship with southern hemisphere circulation in early april and may . when the meridional circulation in middle and high latitude of south pacific in april and may is rather obvious and the south pole eddy is rather strong , the precipitation in middle and lower reaches of yangtze river may be bigger than ever 4 )梅雨期长江中下游降水多寡与前期4 、 5月南半球环流存在联系，当4 、 5月南太平洋中高纬度地区经向环流较为明显，南极涡偏强时，长江中下游地区梅雨期降水易偏多；反之，当4 、 5月南太平洋中高纬度地区纬向气流较为明显，高纬度西风较弱，南极涡偏弱时，长江中下游地区梅雨期降水易偏少。
