摘要
本文主要讨论了厄尔尼诺现象对北半球大气环流和中国季凤降水的影响。研究表明，在厄尔尼诺开始年的春夏季，对流层上部位势高度和副热带高压都处在由弱到强的转变状态，我国东部地区大范围少雨；秋季发生明显的趋势转折，秋季到次年夏季，对流层上部位势高度升高，副高增强西伸，除次年２、３月份全国大范围少雨外，其余月份大都为南多北少的分布型，这种分布形态在开始年秋季最典型。厄尔尼诺开始年、次年，长江中下游入梅期偏晚。
in this paper,the influence of EI Nino events on atmospheric circulations in the NorthernHemisphere and precipitation in China is discussed. Analysis suggests that, the geopotential height islower than normal in the upper troposphere and the western Pacific subtropical high at 500 hPa isweaker and the rainfall is less in a large area of China in the spring and summer of EI Nino onset year.Turning date aPPears in Autumn. The height is higher than normal in the upper troPOsphere and thesubtropical high is Stronger from Autumn of the E1 Nino onset year to summer of the next year. the rainfall is above the average in South China and below average in the north during the period exceptlight rain in a great part of China in February and March of the next year. The rainfall pattern is mosttypical in the Autumn of E1 Nino onset year. In addition, beginning date of the Meiyu period is laterthan normal in the middle and lower reaches of the Yangtze River in E1 Nino beginning year and thefollowing year.
出处
《大气科学》
CSCD
北大核心
1996年第4期422-428,共7页
Chinese Journal of Atmospheric Sciences
基金
中国气象局重点科研项目
关键词
厄尔尼诺
大气环流
中国
降水
E1 Ni o atmospheric circulation China precipitation onset of Meiyu
