中东急流与东亚冬季风的相关关系  

The Correlation between the Middle East Jet Stream and the East Asian Winter Monsoon

作　　者：周嘉鑫 

机构地区：[1]成都信息工程大学大气科学学院/大气科学,四川 成都

出　　处：《地理科学研究》2024年第4期851-861,共11页Geographical Science Research

摘　　要：为了研究中东急流对东亚冬季风系统的影响,本文基于1979~2021年ERA5月平均再分析资料,使用EOF分析,回归分析等方法研究了冬季中东急流的时空变化特征及其对东亚冬季大气环流和气温、降水的影响。结果表明:(1) 冬季中东急流变化的第一模态反映出急流核下游的急流变化特征,第二模态呈现出显著的南北反相变化特征,第三模态反映出急流核上游的急流变化特征;(2) 冬季中东急流的强度异常和东西位置异常都对东亚地区的冬季气候变化有着重要影响:当中东急流强度偏强,位置偏东时,中国南方地区出现异常偏南风,有利于冬季降水增多。中国东北、朝鲜半岛及日本地区的通过下沉增温导致冬季温度升高。(3) 中东急流异常对东亚大槽、东亚西风急流有显著影响,中东急流强度偏强,位置偏东时,东亚大槽、东亚急流减弱。对西伯利亚高压和阿留申低压的影响较不显著。To investigate the impact of the Middle East Jet Stream on the East Asian Winter Monsoon System, this study utilized the ERA5 monthly mean reanalysis data from 1979 to 2021, employing EOF analysis, regression analysis, and other methods to examine the spatiotemporal variations of the winter Middle East Jet Stream and its influence on the atmospheric circulation, temperature, and precipitation in East Asia during winter. The results indicate that: (1) The first mode of variation in the winter Middle East Jet Stream reflects the characteristics of jet changes downstream of the jet core, while the second mode exhibits significant north-south phase opposition, and the third mode reflects the characteristics of jet changes upstream of the jet core;(2) Abnormalities in the intensity and east-west position of the winter Middle East Jet Stream have significant impacts on the winter climate change in East Asia: When the jet is unusually strong and located further east, anomalous southerly winds occur in southern China, favoring incre

关 键 词：中东急流 东亚冬季风 气温 降水 

分 类 号：P73[天文地球—海洋科学]