维普中文期刊产品整合服务

Interannual Meridional Displacement of the East Asian Upper-tropospheric Jet Stream in Summer

查看全文 作　　者：[1]林中达;[2]陆日宇 高影响力作者 机构地区：[1]Institute of Atmospheric Physics Chinese Academy of Sciences, Beijing 100080 Graduate School of the Chinese Academy of Sciences,Beijing 100039;[2]Institute of Atmospheric Physics Chinese Academy of Sciences, Beijing 100080高影响力机构 出　　处：《Advances in Atmospheric Sciences》索引2005年第22卷第2期,共13页高影响力期刊 基　　金：This work was supported by the Chinese Academy of Sciences(Grant No.KZCX3 SW-221);the National Natural Science Foundation of China under Grant No.40221503. 摘　　要：On the interannual timescale, the meridional displacement of the East Asian upper-tropospheric jet stream (EAJS) is significantly associated with the rainfall anomalies in East Asia in summer. In this study, using the data from the National Centers for Environmental Prediction-Department of Energy (NCEP/DOE) reanalysis-2 from 1979 to 2002, the authors investigate the interannual variations of the EAJS's meridional displacement in summer and their associations with the variations of the South Asian high (SAH) and the western North Pacific subtropical high (WNPSH), which are dominant circulation features in the upper and lower troposhere, respectively. The result from an EOF analysis shows that the meridional displacement is the most remarkable feature of the interannual variations of the EAJS in each month of summer and in summer as a whole. A composite analysis indicates that the summer (June-JulyAugust, JJA) EAJS index, which is intended to depict the interannual meridional displacement of the EAJS, is not appropriate because the anomalies of the zonal wind at 200 hPa (U200) in July and August only, rather than in June, significantly contribute to the summer EAJS index. Thus, the index for each month in summer is defined according to the location of the EAJS core in each month. Composite analyses based on the monthly indexes show that corresponding to the monthly equatorward displacement of the EAJS, the South Asian high (SAH) extends southeastward clearly in July and August, and the western North Pacific subtropical high (WNPSH) withdraws southward in June and August. 关 键 词：子午线位移 东亚气候 对流层 急流 夏季
相关文献

参考文献(25)

引证文献(86)

耦合文献(169)

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1　渝公网安备 50019002500403号　违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费