1995年北半球主要环流特征及其影响

General Circulation and Its Impact over the Northern Hemisphere in 1995

１９９５年北半球大气环流的主要特征是：５００ｈＰａ西太平洋副热带高压异常偏强，初夏脊线位置偏南，盛夏偏北；亚洲西风带，春季经向环流发展，初夏东亚阻塞形势稳定，盛夏纬向环流盛行；５００ｈＰａ青藏高原位势高度夏半年偏高，冬半年偏低；北半球１００ｈＰａ位势高度低纬度持续偏高，中高纬度持续偏低，南亚高压偏强；１９９４年开始的厄尔尼诺事件于１９９５年３月结束。

General circulation features over the Northern Hemisphere in 1995 are analysed. It is shown that the 500hpa subtropical high over the West Pacific was stronger than normal. Its ridge line moved southward in early summer and northward in mid-summer.Meridional circulation was developed in spring,blocking pattern was stable in early summer,zonal circulation was dominant in mid-summer in Asia. 500hpa geopotential height was higher in summer and lower in winter in Qingzang Plateau. 100hpa geopotential height was persistently higher at the low latitudes and lower in mid latitude,the South Asia high was stronger. The El Nino event occured in 1994 ended in March in 1995.