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对称不稳定与初始扰动尺度关系的数值研究
引用本文:寇正,陆汉城,宋晓亮.对称不稳定与初始扰动尺度关系的数值研究[J].热带气象学报,2004,20(1):81-89.
作者姓名:寇正  陆汉城  宋晓亮
作者单位:解放军理工大学气象学院大气科学系,江苏,南京,211101
基金项目:国家重点基础研究发展规划项目“我国重大气候灾害的形成机理和预测理论研究”(G1998040903)资助
摘    要:采用两个不同的东亚夏季风指数分析了1951~1999年间东亚夏季风强度的年代际变化特征。结果一致表明,20世纪70年代中期左右,东亚夏季风经历了由强到弱的年代际变化。而且西太平洋副热带高压作为东亚季风系统的重要成员,其强度和位置也在1970年代中期左右发生了明显的年代际变化。这种大气环流背景的年代际变化造成了1970年代中期以后我国的华北地区干旱少雨;长江中下游地区洪涝多雨。

关 键 词:东亚夏季风  年代际变化  中国降水
文章编号:1004-4965(2004)01-0073-08
收稿时间:2002/5/29 0:00:00
修稿时间:2002年7月29日

THE NUMERICAL STUDY ON THE RELATION BETWEEN SYMMETRICAL INSTABILITY AND THE SCALE OF INITIAL DISTURBANCE
KOU Zheng,LU Han-cheng and SONG Xiao-liang.THE NUMERICAL STUDY ON THE RELATION BETWEEN SYMMETRICAL INSTABILITY AND THE SCALE OF INITIAL DISTURBANCE[J].Journal of Tropical Meteorology,2004,20(1):81-89.
Authors:KOU Zheng  LU Han-cheng and SONG Xiao-liang
Institution:Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101, China;Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101, China;Institute of Meteorology, PLA University of Science and Technology, Nanjing 211101, China
Abstract:An anelastic and non-hydrostatic two-dimensional numerical model is used to study the influence of initial disturbances scale on the development of symmetrical instability. The results show that: The symmetrical instability does not have to be stirred by horizontal disturbance of correspondent scale of the symmetrical instability; the slant circulations, which are stirred by disturbances of different scales, have different specialties; there may be a minimum critical scale in symmetrical instability slant circulations; there is also an optimal horizontal scale to the development of symmetrical instability, while the vertical scale of disturbance throws less influence on symmetrical instability.
Keywords:East Asia summer monsoon  interdecadal variability  rainfall over China
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