北半球大气遥相关型冬夏差异及其与温度场关系的探讨  

Difference of the Atmospheric Teleconnection Patterns between Winter and Summer over the Northern Hemisphere and Its Relation with the Air Temperature Fields

作　　者：陈芳丽[1,2] 黎伟标[1] 

机构地区：[1]中山大学大气科学系／季风与环境研究中心,广州510275 [2]广东省惠州市气象局,惠州516001

出　　处：《大气科学》2009年第3期513-523,共11页Chinese Journal of Atmospheric Sciences

基　　金：国家自然科学基金资助重点项目40730951;国家自然科学基金联合基金项目U0733002;国家科技支撑计划项目2007BAC03A02

摘　　要：利用55年的NCEP/NCAR再分析资料,采用合成分析等方法探讨了冬、夏季北半球大气遥相关型的差异及其与温度场的关系。主要结果有:北半球冬、夏季典型的大气遥相关型具有很大的差异,且大气遥相关路径的偏折与温度场的变化有密切的关系。北半球冬季,呈经向型分布特征的大气遥相关路径在温度纬向梯度正负号发生改变处发生偏折;而在北半球夏季,由于温度场分布呈现纬向特征,遥相关路径不易产生南北向的偏折,从而使得异常中心基本上沿纬圈分布,呈明显的纬向特征。此外,由于冬季等温线南北起伏明显的区域往往位于东西方向海陆交界处,因此冬季大气遥相关路径往往在东西向海陆交界处发生偏折。The different features of the atmospheric teleconnection patterns between winter and summer over the Northern Hemisphere （NH） and their relations with the air temperature fields are studied using the 55 years NCEP/ NCAR reanalysis data. It is found that there are obvious differences in the routes of the atmospheric teleconnection between winter and summer over the NH. The teleconnection route in winter exhibits meridional features while the teleconnection route is noticeably zonal in summer. Results also show that the deflection of teleconnection route is closely related to the zonal air temperature gradient. The teleconneetion route deflects when the zonal air temperature gradient is zero, which may results in the difference of the teleeonnection routes between winter and summer over the NH.

关 键 词：北半球大气遥相关 遥相关路径偏折 大气温度场 

分 类 号：P434[天文地球—大气科学及气象学]