东亚副热带西风急流年际变化特征分析  

Analysis on Inter-annual Variation of East Asian Subtropical Westerly Jet

作　　者：廖琦 肖天贵[1] 金荣花 LIAO Qi1, XIAO Tian-Gui1, JIN Rong Hua2(1. College of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610225, China;2. National Meteorological Center, Beijing 100081,Chin)

机构地区：[1]成都信息工程大学大气科学学院,四川成都610225 [2]国家气象中心,北京100081

出　　处：《成都信息工程大学学报》2018年第1期68-77,共10页Journal of Chengdu University of Information Technology

基　　金：国家自然科学基金资助项目(91337215;41575066);国家科技支撑计划资助项目(2015BAC03B05);公益性行业(气象)科研专项资助项目(GYHY201406015)

摘　　要：为了研究东亚副热带地区西风急流随季节变化的急流轴、急流中心以及急流强度的年际变化特征,定义了西风急流位置指数和随季节变化不同区域的急流强度指数,进行数据标准化及小波能量频谱分析处理以便进一步分析其周期变化特征。研究结果表明:春季和冬季北半球副热带地区稳定存在一个急流带,副热带西风急流强度在夏季最弱,冬季最强。随着年际变化,春季急流轴南移,其他季节急流轴北移,冬季北移最显著;冬季急流中心西移,其他季节东移,秋季移动幅度最大;春季急流强度增强,夏季和秋季急流强度减弱,冬季急流强度稳定强盛。In order to study the inter-annual variability of the westerly jet stream in the East Asia subtropical region with the seasonal variation of the jet stream axis,the jet stream center and the jet stream intensity,the westerly jet stream position index and the jet flow intensity index in different regions with different seasons are defined,and the data standardization and wavelet energy spectrum analysis were performed to further analyze their periodic variation characteristics. The results show that there is a stable jet stream in the northern hemisphere subtropical region in spring and winter,and the intensity of the subtropical westerly jet stream is weakest in summer and strongest in winter.With the inter-annual variation,the jetaxis in spring moved southward,while it moved northward in other seasons. Moreover,the jet axisin winter moved northward most significantly.The jet stream center in winter moved westward,with the other seasons moving eastward and it moves the most in autumn.The jet intensity in spring was enhanced,and it＇s weakened in summer and autumn. And it was stable and strong in winter.

关 键 词：大气科学 大气环流 西风急流 急流轴 急流强度 

分 类 号：P434[天文地球—大气科学及气象学]