不同气候背景下新疆冬季极端冷(暖)事件的变化特征  

Variations of Extreme Cold( Warm) Events in Winter in Xinjiang under Different Climate Background

作　　者：陈颖[1] 李维京[2] 史红政[3] 刘精 

机构地区：[1]新疆气候中心,新疆乌鲁木齐830002 [2]国家气候中心,北京100081 [3]新疆气象局,新疆乌鲁木齐830002

出　　处：《沙漠与绿洲气象》2016年第4期17-24,共8页Desert and Oasis Meteorology

基　　金：新疆气象局面上项目(MS201607);国家自然科学基金委-新疆联合基金项目(U1138301);中国气象局气候变化专项(CCSF201425)共同资助

摘　　要：利用1961—2013年新疆89站逐日气温和NCEP再分析高度场资料,分析了不同气候背景下新疆1961年以来冬季(12月—翌年2月)出现的极端冷(暖)事件年代际变化及与其相联系的环流特征。根据对新疆冬季极端冷(暖)事件的气候背景划分,认为新疆冬季极端冷(暖)事件在不同气候背景中都有明显的不同,全疆冬季极端冷事件存在随气候背景转变而发生区域一致变化的特征,但冬季极端暖事件的变化则有南北反相的区域差异。总体而言,新疆极端冷暖事件发生的日数趋于减少,极端冷暖事件强度也具有显著减小的趋势;北疆西部和天山两侧是气候极端性变化最显著的区域。从冷暖期环流特征的差异来看,北疆型极端冷事件减少的主要原因来自于突变后极涡减弱,而南疆型极端冷(暖)事件减少(增加)则主要受欧亚范围内大片正变高区的影响。The variability of extreme cold （warm）events in winter in Xinjiang since 1961 has beenanalyzed based on the daily air temperature and NCEP reanalysis data under different climatebackground. According to the different climate background, the variation characteristics of theextreme cold events are anomalies in the whole Xinjiang, but the extreme warm events show theregional differences in the north and south parts of Xinjiang. The frequency of extreme cold （warm）events in Xinjiang tends to increase, but the intensity of extreme cold （warm）events decreasessignificantly. The climate has more significant extreme changes in the west parts of northernXinjiang and both side of Tianshan Mountains. The weakened polar vortex plays an important rolein the decreased extreme cold events, and the extreme warm events in southern Xinjiang are wellrelated to the positive height anomalies of Eurasian circulation.

关 键 词：冬季气候 极端冷暖事件 环流特征 新疆 

分 类 号：P468.021[天文地球—大气科学及气象学]