Propagation and influence on tropical precipitation of intraseasonal variation over mid-latitude East Asia in boreal winter

作     者：JIAO Yang WU Renguang JIAO Yang;WU Renguang

作者机构：Center for Monsoon System ResearchInstitute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina College of Earth and Planetary SciencesUniversity of Chinese Academy of SciencesBeijingChina State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid DynamicsInstitute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina 

出 版 物：《Atmospheric and Oceanic Science Letters》 (大气和海洋科学快报（英文版）)

年 卷 期：2019年第12卷第3期

页      面：155-161页

核心收录：

学科分类：07[理学] 

基　　金：supported by the National Natural Science Foundation of China [grant numbers 41530425 41721004 41475081 and 41775080] 

主　　题：Intraseasonal wind variation midlatitude East Asia eastward and southward propagation tropical precipitation 

摘      要：The authors investigate the characteristics of propagation and the influence on tropical precipitation of 9–29-day intraseasonal variation over midlatitude East Asia during boreal winter, and find that the intraseasonal wind signal can propagate both eastward and southward. In the case of eastward propagation, the intraseasonal wind signal is mainly confined to the midlatitudes, featuring eastward migration of anomalous cyclones and anticyclones. In the case of southward propagation, intraseasonal meridional wind perturbations may extend from the mid to the low latitudes, and even the equatorial region. The accompanying wind convergence/divergence induces anomalous precipitation in the near-equatorial regions, forming a north–south dipole precipitation anomaly pattern between the southern South China Sea and the eastern China– Japan region. An anomalous meridional overturning circulation plays an important role in linking tropical and midlatitude intraseasonal wind and precipitation variations.