摘要
利用江淮地区64个测站1961—2001年6—7月最高气温资料,采用旋转经验正交展开(REOF)方法对江淮地区梅雨期最高气温场进行客观分区,并分析了各区域最高气温的长期演变趋势。结果表明:江淮地区梅雨期最高气温场可分为3个区域,各区域的最高气温均具有明显的年代际变化特征,且存在着显著差异,其中东南区长期变化趋势不明显,而北方区和西南区显著降低;各区域存在明显不同的年际、年代际方差构成和多尺度振荡周期。
Using the June and July maximum temperature data at 64 observational stations from 1961 to 2001,the Changjiang-Huaihe valley's maximum temperature field in the Mei-yu period is divided objectively into 3 subdivisions by using the rotated empirical orthogonal function(REOF) method.Based on this,the long-term trend of each subdivision maximum temperature in the Mei-yu period is analyzed.Results indicate that the maximum temperature fields in 3 subdivisions have distinct interdecadal change character in the recent 41 years,and there is obvious regional difference:the long-term trend of southeast subdivision's maximum temperature is not distinct,but that of north subdivision's and southwest subdivision's is markedly decreasing.The interannual(interdecadal) variance contribution and variation periods in 3 subdivisions exhibit remarkable diversity.
出处
《南京气象学院学报》
CSCD
北大核心
2005年第3期308-315,共8页
Journal of Nanjing Institute of Meteorology
基金
国家自然科学基金资助项目(4023303740175021)
关键词
旋转经验正交展开
江淮地区
梅雨期
最高气温
长期演变趋势
<Keyword>rotated empirical orthogonal function
Changjiang-Huaihe valley
Mei-yu period
maximum temperature
long-term trend
