近53a中国东部雨季降水的区域特征
投稿时间:2004-10-27  修订日期:2005-01-14  点此下载全文
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作者单位
王永 南京信息工程大学, 大气科学系, 江苏, 南京, 210044 
陆维松 南京信息工程大学, 大气科学系, 江苏, 南京, 210044 
龚龑 南京信息工程大学, 大气科学系, 江苏, 南京, 210044 
基金项目:国家自然科学基金资助项目(40275016);江苏省科技计划社会发展项目“持续性暴雨的预报新技术”
中文摘要:利用1951—2003年中国东部114个站雨季(4—9月)降水量资料作旋转经验正交函数(REOF)展开,根据前5个旋转空间模上高载荷区分布,将中国东部地区分成5个降水气候区,即东北南部、河套地区、江淮地区、长江中下游地区及华南地区。Morlet小波分析结果表明,除了7~8 a的周期外,各区还存在不同的振荡周期。长期变化趋势显示各区在53 a中基本上呈两波型,东北南部、河套地区和江淮地区降水发生突变的时间为20世纪60年代末70年代初,降水下降趋势显著,长江中下游及华南地区降水突变时间为90年代初,降水有弱的上升趋势。
中文关键词:中国东部  旋转经验正交函数(REOF)  周期  长期趋势
 
Regional Characteristics of Precipitation in the Rainy Season over Eastern China during Last 53 Years
Abstract:By applying rotated empirical orthogonal function(REOF) analysis to precipitation in rainy season(April-September) from 1951 to 2003 at 114 selected stations over eastern China,defined by the large contours of the five REOF modes,5 active centers are identified:the southern part of Northeast China,the Hetao region,the Yangtze and Huaihe river basins,the middle and lower Yangtze River valley and South China.Morlet wavelet analysis indicates that there have different oscillation periods in addition to the 7~8-year period in each region.Long-term trends show that the subareas basically presented tow-waves in the 53-year,and the southern part of Northeast China,the Hetao region,the Yangtze and Huaihe river basins all had a sudden change of precipitation in rainy season around the late 1960’s with a evident decreasing,but the middle and lower Yangtze River valley and South China had a sudden change in the early 1990’s with a weak rising.
keywords:Eastern China  rotated empirical orthogonal function  period  long-term trend
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