doi:  10.3878/j.issn.1006-9895.1803.18107
夏季东亚高空副热带西风急流季节内异常的环流特征及前兆信号

Anomalous Circulation Characteristics of Intraseasonal Variation of East Asian Subtropical Westerly Jet in Summer and Precursory Signals
摘要点击 1281  全文点击 251  投稿时间:2018-01-15  修订日期:2018-01-15
查看HTML全文  查看全文  查看/发表评论  下载PDF阅读器
基金:  41375055 Funded by National Natural Science Foundation of China (Grant 41375055) 宣守丽2 孙淑清1
中文关键词:  西风急流 季节内变化 Rossby波列 海温
英文关键词:  East Asian westerly jet, Intraseasonal variation, Rossby wave, SST
     
作者中文名作者英文名单位
张庆云宣守丽zhang qingyun江苏省农业科学院/农业部长江下游平原农业环境重点实验室
孙淑清中国科学院大气物理研究所国际气候与环境科学中心
引用:张庆云宣守丽,孙淑清.2018.夏季东亚高空副热带西风急流季节内异常的环流特征及前兆信号[J].大气科学
Citation:zhang qingyun.2018.Anomalous Circulation Characteristics of Intraseasonal Variation of East Asian Subtropical Westerly Jet in Summer and Precursory Signals[J].Chinese Journal of Atmospheric Sciences (in Chinese)
中文摘要:
      摘 要 位于东亚中纬度上空的东亚高空副热带西风急流是东亚季风环流系统中的重要成员,夏季我国降水雨带的季节内变化受东亚高空副热带西风急流位置季节内异常变化影响。文章根据1979~2008年中国降水资料、NCEP/NCAR再分析资料以及NOAA ERSST V3月平均海表温度资料,利用统计分析和物理量诊断方法对夏季东亚高空副热带西风急流位置季节内异常的东亚大气环流特征及外强迫信号的物理过程进行了探讨。研究指出:6月东亚高空副热带西风急流位置异常主要受欧亚大陆中高纬东传的Rossby波列位相变化影响,春季北大西洋海温异常是欧亚大陆中高纬度Rossby波列位相变化的最显著的外强迫信号;7月东亚高空副热带西风急流位置异常主要受西太平洋热带向副热带传播的Rossby波列位相变化影响,春季西太平洋热带海温异常是西太平洋热带向副热带传播的Rossby波列位相变化的最显著的外强迫信号;8月东亚高空副热带西风急流位置异常主要受南亚大陆向东亚大陆热带、副热带传播的Rossby波列位相变化影响,春季印度洋海温异常是南亚大陆向东亚大陆热带、副热带传播的Rossby波列位相变化的最显著的外强迫信号。
Abstract:
      Abstract The East Asian westerly jet (EAWJ) is one of the most important circulation systems in East Asia which linked the high and low latitude circulations over East Asia. The intraseason variation of position and intensity of EAWJ during June~August and with the East Asian circulation characteristics as well as the physical process were discussed by using statistical analysis and physical process diagnosis method Based on NCEP / NCAR reanalysis data and NOAA ERSST V3 monthly mean sea surface temperature (SST) data during 1979 to 2008. The physical mechanism of intraseasonal shift of EAWJ was studied. The study pointed out that in June, the position shift of the EAWJ was affected by the phase variation of Rossby wave eastward propagating in the Eurasian continent. The North Atlantic SST anomaly (colder or warmer than normal) in spring was the most significant forcing signal for the phase variation of Rossby wave in the Eurasian continent. In July, the position shift of the EAWJ was affected by the phase variation of Rossby wave northward propagating from the tropical to subtropical over the western Pacific. The tropical west Pacific SST anomaly in spring was the most significant forcing signal for the phase variation of Rossby wave over the western Pacific. In August, the position shift of the EAWJ was affected by the phase variation of Rossby wave northward propagating from South Asia to the tropical and subtropical in East Asian. The Indian Ocean SST anomaly in spring was the most significant forcing signal for the phase variation of Rossby wave in South Asia as well as the tropical and subtropical in East Asian.
主办单位:中国科学院大气物理研究所 单位地址:北京市9804信箱
联系电话: 010-82995051,010-82995052传真:010-82995052 邮编:100029 Email:dqkx@mail.iap.ac.cn
本系统由北京勤云科技发展有限公司设计
京ICP备09060247号