华北冬季气温年代际变化及大气环流分析  

Inter-decadal variations of winter air temperature in north China and its circulation background

作　　者：申红艳[1,2] 丁裕国[2] 张捷[2] 

机构地区：[1]青海省气候中心,西宁810001 [2]南京信息工程大学气象灾害与环境变化重点实验室,南京210044

出　　处：《气象科学》2010年第3期338-343,共6页Journal of the Meteorological Sciences

基　　金：国家自然基金项目(40675043)

摘　　要：用NCEP/NCAR再分析资料和华北地区冬季气温资料,运用经验正交分解(EOF)和合成分析等方法,分析了华北地区冬季气温年代际异常及同期环流背景场的变化特征。结果表明:华北冬季气温的年代际变化特征明显;北半球冬季环流场的年代际变化是造成华北冬季气温年代际异常的根本原因,在近地面层,西伯利亚高压偏强时,华北冬季偏冷,反之亦然;在对流层中层,东亚大槽及贝加尔湖高压脊为主要影响系统;低空风场分析结果显示,华北冬季偏冷期中、高纬纬向环流减弱,经向环流明显增强,主要盛行偏北风,暖期情况正好相反。另据分析,北极涛动的年代际变化与华北冬季气温异常也有很好的相关性。In terms of NCEP/ NCAR reanalysed data and the temperature data of China in winter from 1960 to 2004,by applying the methods of empirical orthogonal decomposition（EOF） and synthetic analysis etc,the inter-decadal variations of winter air temperature in north China and the atmospheric circulation characteristics are studied.The results show that inter-decadal variation of winter temperature in north China is obvious.The inter-decadal variation of circulation in winter is a fundamental reason causing inter-decadal abnormity of air temperature in north China.In the near-surface,when Siberian high pressure is stronger,it will be cold in north China,and the vice versa.In the middle troposphere,the east Asian trough and Lake Baikal ridge of high pressure are the main impact system.The analysis of low-level wind field show that the high-latitude zonal circulation is weakened and the meridional circulation is enhanced.The main prevailing wind is inclinable to being from north,but it is just opposite in the warm-term.Furthermore,the change of Arctic Oscillation is also a significant impact on winter temperature anomalies in north China.

关 键 词：冬季气温 年代际异常 环流 

分 类 号：P412[天文地球—大气科学及气象学]