中部型ENSO对中国东部地区夏季极端降水影响的年代际变化  

Interdecadal Variation of the Impact of Central ENSO on Summer Extreme Precipitation over Eastern China

作　　者：张可 ZHANG Ke(Jiange Meteorological Service,Jiange 628300,China)

机构地区：[1]四川省剑阁县气象局,剑阁628317

出　　处：《高原山地气象研究》2023年第S01期45-50,共6页Plateau and Mountain Meteorology Research

摘　　要：为研究中部型厄尔尼诺事件对中国东部地区夏季极端降水影响的年代际变化,采用CNO5逐日降水资料,以及气压、风场、总云量等夏季再分析资料,通过统计方法,研究在热带中太平洋地区海温影响下,发生在中国东部地区的夏季平均降水,以及极端降水的年代际变化,并分析其原因。结果表明:热带中太平洋区域的海温有明显的增暖性突变,这一突变使得中国东部地区的夏季降水呈现显著性下降趋势,造成这一显著性下降的主要原因是热带中太平洋的海温增暖导致周边地区环流场的形势发生改变,使得中国东部地区夏季的降水减少。In order to study the interdecadal variation of the influence of central El Nino events on summer extreme precipitation in eastern China,the summer reanalysis data of CN05 daily precipitation data and the summer reanalysis data such as atmospheric pressure,wind field and total cloud amount are used to study the interdecadal variation of summer average precipitation and extreme precipitation in eastern China under the influence of sea temperature in tropical central Pacific region by statistical methods,and the causes are analyzed.The results show that the sea surface temperature in the tropical central Pacific region has an obvious warming mutation,which makes the summer precipitation in eastern China show a significant downward trend.The main reason for this significant decline is that the warming of the sea surface temperature in the tropical central Pacific leads to the change of the circulation field in the surrounding area,which makes the summer precipitation in eastern China decrease.

关 键 词：热带中太平洋海温 中国东部 夏季降水 极端降水 

分 类 号：P458.121[天文地球—大气科学及气象学]