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我国东部夏季降水异常主模态的年代际变化及其与东亚水汽输送的关系
引用本文:黄荣辉,陈际龙,刘永.我国东部夏季降水异常主模态的年代际变化及其与东亚水汽输送的关系[J].大气科学,2011,35(4):589-606.
作者姓名:黄荣辉  陈际龙  刘永
作者单位:中国科学院大气物理研究所季风系统研究中心, 北京,100190
基金项目:国家重点基础研究发展规划项目2010CB950403、2009CB421405,国家自然科学基金资助项目40975046,国家公益性行业(气象)专项GYHY201006021,国家自然科学基金资助项目40730952
摘    要:本文利用1958~2000年ERA-40再分析每日资料和我国516台站降水资料以及EOF方法,分析了我国东部季风区夏季降水异常主模态的年代际变化特征及其与东亚上空水汽输送通量时空变化的关系.分析结果表明了我国东部季风区夏季降水的时空变化存在两种主模态:第1主模态不仅显示出明显的准两年周期振荡的年际变化特征且也有明显的年...

关 键 词:降水  主模态  水汽输送  通量  时空变化

Interdecadal Variation of the Leading Modes of Summertime Precipitation Anomalies over Eastern China and Its Association with Water Vapor Transport over East Asia
HUANG Ronghui,CHEN Jilong and LIU Yong.Interdecadal Variation of the Leading Modes of Summertime Precipitation Anomalies over Eastern China and Its Association with Water Vapor Transport over East Asia[J].Chinese Journal of Atmospheric Sciences,2011,35(4):589-606.
Authors:HUANG Ronghui  CHEN Jilong and LIU Yong
Affiliation:Center for Monsoon System Research, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100190
Abstract:Interdecadal variation of the leading modes of summertime precipitation anomalies in the monsoon regions of eastern China and its association with the spatio-temporal variations of summertime water vapor transport fluxes over East Asia are analyzed by using the daily data of the ERA-40 reanalysis and precipitation data at 516 observational stations of China for 1958-2000 and the EOF analysis method.The analysis results show that there are two leading modes in the spatio-temporal variations of summertime precipitation anomalies over the monsoon region of eastern China:The first leading mode exhibits not only a characteristic of obvious interannual variation with a quasi-biennial oscillation,but also a feature of interdecadal variability,and its spatial distribution is of a meridional tripole pattern.And the second leading mode exhibits a characteristic of obvious interdecadal variability,and its spatial distribution is of a meridional dipole pattern.This shows that these two leading modes have a significant interdecadal variability.During the period of 1958-1977,the distribution of summertime precipitation anomalies in eastern China exhibited a "+-+" meridional tripole pattern from the south to the north,and the distribution of precipitation anomalies for 1978-1992 showed a "-+-" meridional tripole pattern in the region,which was opposite to that for 1958-1977,but during the period of 1993-1998,since the role of the second leading mode in summertime precipitation anomalies in eastern China was intensified,the distribution of summertime precipitation in this region showed a combination of "+-+" meridional tripole pattern and "+-" meridional pattern,which caused the increase of summertime precipitation in South China.Moreover,the analysis results also show that the interdecadal variation of these two leading modes is closely associated with the spatio-temporal variations of summertime water vapor transport fluxes over East Asia,which is associated not only with the interdecadal variation of the EAP pattern teleconnection-like wave-train distribution of summertime water vapor transport flux anomalies over East Asia and the western North Pacific,but also with the interdecadal variation of the EU pattern teleconnection-like wave-train distribution of summertime waver vapor transport flux anomalies in the westerly zone over middle and high latitudes of Eurasia.
Keywords:precipitation  leading mode  water vapor transport  flux  spatio-temporal variations
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