| 近百年中国东部夏季降水的时空变率 |
| |
| 作者姓名： | Li Xiaodong Zhu Yafen Qian Weihong |
| |
| 作者单位： | Li Xiaodong Zhu Yafen and Qian WeihongDepartment of Atmospheric Sciences，School of Physics，Peking University，Beijing 100871 |
| |
| 基金项目： | The authors wish to thank Professor Wang Shaowu from the Department of Atmospheric
Sciences of Peking University, who generously provided the China Summer Rainfall Station Data used in this study. This research was supported by the National Key Program |
| |
| 摘 要： | 利用中国东部25°N以北28个站1880-1999年夏季季降水序列,用旋转复经验正交函数（RCEOF）方法,研究了中国东部地区百年干湿的时空演变规律。结果表明,夏季降水空间变率大值区依次为:长江中下游地区、淮河流域、江南、华北、西南及东北。除西南外的5个关键区大体上反映了从6月到8月夏季雨带自南向北椎进所滞留的地区。旋转空间位相分布揭示了长江中下游地区、江南、东北的旱涝异常主要表现为驻波振动特征;而淮河流域、华北、西南地区显示出降水异常信号具有部分的行波特征。尤其第4空间模显示出旱涝异常信号从东北南部可沿着黄淮下游传到长江下游地区。对于近百年中国东部地区夏季于湿变化,长江中下游地区、淮河流域、华北及东北四个地区都存在20-25年时间尺度的周期振荡;长江中下游地区及华北地区都存在准60年时间尺度的振荡周期;东北地区主要表现出36年时间尺度的振荡周期;淮河流域存在明显的70-80年时间尺度的振荡周期;华北地区存在的11年时间尺度的振荡周期恰好与太阳黑子活动的11年周期相一致。在年代际时间尺度（包括次年代际时间尺度）上,长江中下游、淮河流域及华北地区的夏季降水的变化与太阳活动有显著的正相关。
|
| 关 键 词： | 经验正交函数 旋转复经验正交函数 夏季 降水 旱涝异常 驻波 行波 年代际 中国东部 |
| 收稿时间： | 5 January 2002 |
Spatiotemporal variations of summer rainfall over eastern China during 1880–1999 |
| |
| Li Xiaodong,Zhu Yafen,Qian Weihong.Spatiotemporal variations of summer rainfall over eastern China during 1880–1999[J].Advances in Atmospheric Sciences,2002,19(6):1055-1068. |
| |
| Authors: | Li Xiaodong Zhu Yafen Qian Weihong |
| |
| Institution: | Department of Atmospheric Sciences, School of Physics, Peking University, Beijing 100871,Department of Atmospheric Sciences, School of Physics, Peking University, Beijing 100871,Department of Atmospheric Sciences, School of Physics, Peking University, Beijing 100871 |
| |
| Abstract: | By applying rotated complex empirical orthogonal function (RCEOF) analysis on 1880-1999 summer rainfall at 28 selected stations over the east part of China, the spatio-temporal variations of China summer rainfall are investigated. Six divisions are identified, showing strong temporal variability, the middle and lower reaches of the Yangtze River, the Huaihe River, Southeast China, North China, Southwest China, and Northeast China. The locations of all divisions except Southwest China are in a good agreement with those of the rainband which moves northward from Southeast China to Northeast China from June-August. The phase relationship revealed by the RCEOF analysis suggests that rainfall anomalies in the middle and lower reaches of the Yangtze River, Southeast China, and Northeast China are all characterized by a stationary wave, while a traveling wave is more pronounced in the Huaihe River division, North China, and Southwest China. The fourth RCEOF mode indicates that rainfall anomalies can propagate from south of Northeast China across lower reaches of the Huanghe River and the Huaihe River to the lower reaches of the Yangtze River. A 20-25-year oscillation is found at the middle and lower reaches of the Yangtze River, the Huaihe River valley, North China, and Northeast China. The middle and lower reaches of the Yangtze River and Northeast China also show an approximately-60-year oscillation. Northeast China and the Hnaihe River division are dominated by a 36-year and a 70-80-year oscillation, respectively. An 11-year oscillation is also evident in North China, with a periodicity similar to sunspot activity. The interdecadal variability in the middle and lower reaches of the Yangtze River, the Huaihe River valley, and North China shows a significant positive correlation with the solar activity. |
| |
| Keywords: | empirical orthogonal function (EOF) rotated complex EOF (RCEOF) China summer rainfall drought and flood anomaly stationary wave traveling wave interdecadal variability |
| 本文献已被 CNKI 万方数据 SpringerLink 等数据库收录！ |
| 点击此处可从《大气科学进展》浏览原始摘要信息 |
| 点击此处可从《大气科学进展》下载免费的PDF全文 |
|
