长江中下游地区1月气温异常及大气环流特征分析

利用1951—2008年长江中下游地区25个站的1月气温资料和逐年1月大气环流资料,分析了长江中下游地区1951—2008年1月气温变化特征,并对1月异常偏冷、偏暖年的环流形势进行对比分析。结果表明:该地区1月气温呈明显的上升趋势,从此趋势的分布状况上看,长江中下游地区除贵州省外都呈上升趋势。气温异常的年份有11a,其中偏冷年有6a,偏暖年有5a。造成这些异常年份的主要系统是西伯利亚高压、乌山脊、东亚高纬度温带西风急流与东亚副热带西风急流。

ANALYSIS OF THE ANOMALOUS CHARACTEIUSTICS OF ANALYSIS OF THE ANOMALOUS CHARACTERISTICS OF JANUARY TEMPERATURE AND ATMOSPHERIC CIRCULATION IN THE MID-LOWER REACHES OF THE YANGTZE RIVER

By using the 1951—2008 January temperatures and atmospheric circulation data of 25 stations in the mid-lower reaches of the Yangtze River,the characteristics of January temperatures are studied,and the circulation of January abnormal warmer and colder years is comparative analyzed.The results show that base on the spatial distributions,the January temperature of the region shows a notable increasing tendency except for Guizhou.More than 11 years present temperature anomaly years,of which are 6 warmer years and 5 colder years.The major systems inducing these anomalies are Siberian High,Urals ridge,the temperate zone and sub-tropical westerly jet in East Asia.