El Ni?o对东亚夏季风和夏季降水季节内变化的影响

被引:11
作者
赵俊杰 [1 ,2 ]
薛峰 [3 ]
林万涛 [2 ]
段安民 [2 ]
机构
[1] 成都信息工程大学大气科学学院
[2] 中国科学院大气物理研究所大气科学与地球流体力学数值模拟国家重点实验室
[3] 中国科学院大气物理研究所国际气候与环境科学中心
关键词
东亚夏季风; 副热带高压; El Ni?o; 季节内变化; 夏季降水;
D O I
暂无
中图分类号
P461.2 []; P732 [海洋气象学];
学科分类号
0706 ; 070601 ;
摘要
基于1979~2012年候平均再分析资料,合成分析了El Ni?o对东亚夏季风和夏季降水季节内变化的影响。结果表明,在El Ni?o衰减年夏季,西太平洋副热带高压(副高)明显偏强,位置偏向西南。副高的这种异常特征随夏季的季节进程有明显变化,初夏异常较弱,盛夏期间异常达到最强。此外,根据东亚夏季风降水呈现阶段式北进的特征,将夏季分为华南前汛期、江淮梅雨期、华北和东北雨期以及华南后汛期来分析东亚夏季风和降水的季节内变化。在上述各个时期,大气对流层低层表现为一致的环流异常型,副高及其以南区域为异常反气旋,其北部为异常气旋。这种异常环流型加强了副高南部偏东风及其北部偏北风,增强了热带水汽输送和高纬度地区冷空气的入侵,二者结合造成主汛期地区降水增加。需要强调的是,上述环流异常型随东亚夏季风逐步向北推移,导致东亚各地区的主汛期降水增加,非主汛期降水减少,降水分布更为集中。
引用
收藏
页码:678 / 686
页数:9
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