摘要
利用夏季(6—8月)中国东北地区91站44 a气温资料,采用谐波分析方法将该区夏季气温异常变化的年代际、年际尺度分量分离,研究时空特征,然后应用REOF进行气温异常的区划,研究局域异常变化的年代际、年际分量的变化特征。结果发现:1)东北各站夏季异常方差中,东北大部分地区的气温异常的年代际变化分量均明显大于年际变化分量。2)区域气温异常的年代际变化主要特征为线性上升趋势。大范围夏季异常高温(低温)常出现在年代际、年际异常同时为正(负)的年份。3)气温异常可划分为南部型、北部型、东部型、西部型4个型,其中南部型和西部型的年代际变化相对重要,而东部型和北部型的年际变化相对重要。
All data used are the summer（JJA） temperature of 91 stations in Northeast China from 1955 to 1998. We use the harmonic analysis to separate interannual and interdecadal variations of summer temperature anomaly, further our study on the spatial and temporal characteristics of the two different time scales, and finally apply the REOF method to demarcate the climatic subarea of temperature anomaly, aiming at looking into the abnormal characteristics of different time scales in local regions. The results show that ： 1 ） the interdecadal component of variance is obviously larger than the interannual component in the most part of Northeast China;2）the interdecadal variation character of regional temperature anomaly is mainly a linear rising trend, and the large range anomalous high （low） temperature frequently occurs when the interdecadal and interannual anomaly are both positive （negative） ; 3 ） the temperature anomaly can be divided into four patterns ： southern, northern, eastern and western patterns,in which the interdecadal variation of the southern and western patterns is relatively important,while the interannual variation of eastern and northern pattern is relatively important.
出处
《南京气象学院学报》
CSCD
北大核心
2005年第6期801-807,共7页
Journal of Nanjing Institute of Meteorology
基金
国家自然科学基金资助项目(40233037)
关键词
东北夏季
气温异常
时空特征
年代际变化
年际变化
summer of Northeast China
temperature anomaly
spatial and temporal characteristics
interdecadal variation
interannual variation
