The Cold Vortex Circulation over Northeastern China and Regional Rainstorm Events  

作　　者：Xie Zuo-Wei Bueh Cholaw Ji Li-Ren Sun Shu-Qing 

机构地区：[1]International Center for Climate and Environment Science (ICCES), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China [2] The State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China

出　　处：《Atmospheric and Oceanic Science Letters》2012年第2期134-139,共6页大气和海洋科学快报(英文版)

基　　金：jointly supported by the National Natural Science Foundation of China(Grant No.40975033);the National Key Technologies R&D Program of China(Grant No.2009BAC51B02)

摘　　要：In this study,regional rainstorm events (RREs) in northeastern China associated with the activity of the Northeastern China Cold Vortex (NCCV) were investigated on a medium-range time scale.The RREs occurring in northeastern China could be categorized into three groups according to the distribution of heavy rainfall.The largest cluster is characterized by the rainstorm events that occur on the northwestern side of the Changbai Mountains along a southwest-northeast axis.These events occur most frequently during the post-meiyu period.The authors place particular emphasis on the RREs that belong to the largest cluster and are closely associated with the activity of the NCCV.These RREs were preconditioned by the transportation of substantial amounts of water vapor to which the anomalous western Pacific subtropical high (WPSH) contributed.The attendant anomalous WPSH was primarily driven by the anomalous transient eddy feedback forcing the nearby East Asian jet.The development of the NCCV circulation was concurrent with the RREs and acted as their primary causative factor.A perspective based on low-frequency dynamics indicates that Rossby wave packets emanated from the blocking-type circulation over northeastern Asia led to the development of the NCCV activity.In this study,regional rainstorm events (RREs) in northeastern China associated with the activity of the Northeastern China Cold Vortex (NCCV) were investigated on a medium-range time scale.The RREs occurring in northeastern China could be categorized into three groups according to the distribution of heavy rainfall.The largest cluster is characterized by the rainstorm events that occur on the northwestern side of the Changbai Mountains along a southwest-northeast axis.These events occur most frequently during the post-meiyu period.The authors place particular emphasis on the RREs that belong to the largest cluster and are closely associated with the activity of the NCCV.These RREs were preconditioned by the transportation of substantial amounts of water vapor to which the anomalous western Pacific subtropical high (WPSH) contributed.The attendant anomalous WPSH was primarily driven by the anomalous transient eddy feedback forcing the nearby East Asian jet.The development of the NCCV circulation was concurrent with the RREs and acted as their primary causative factor.A perspective based on low-frequency dynamics indicates that Rossby wave packets emanated from the blocking-type circulation over northeastern Asia led to the development of the NCCV activity.

关 键 词：RAINSTORM northeastern China cold vortex Rossby wave 

分 类 号：P458.121.1[天文地球—大气科学及气象学] P433