Planetary Wave Reflection and Its Impact on Tropospheric Cold Weather over Asia during January 2008  

作　　者：Debashis NATH CHEN Wen WANG Lin MA Yin 

机构地区：[1]Center for Monsoon System Research,Institute of Atmospheric Physics, Chinese Academy of Sciences

出　　处：《Advances in Atmospheric Sciences》2014年第4期851-862,共12页大气科学进展（英文版）

基　　金：supported jointly by the National Basic Research Program of China (Grant No. 2010CB 428603);the National Natural Science Foundation of China (Grants Nos. 41250110073, 41350110331 and 41025017);the Chinese Academy of Sciences fellowship for young international scientists (Grant No. 2011Y2ZZB05);a China postdoctoral science foundation grant (Grant No. 2013M541010)

摘　　要：Reflection of stratospheric planetary waves and its impact on tropospheric cold weather over Asia during January 2008 were investigated by applying two dimensional Eliassen-Palm （EP） flux and three-dimensional Plumb wave activity fluxes.The planetary wave propagation can clearly be seen in the longitude-height and latitude-height sections of the Plumb wave activity flux and EP flux,respectively,when the stratospheric basic state is partially reflective.Primarily,a wave packet emanating from Baffin Island/coast of Labrador propagated eastward,equatorward and was reflected over Central Eurasia and parts of China,which in turn triggered the advection of cold wind from the northern part of the boreal forest regions and Siberia to the subtropics.The wide region of Central Eurasia and China experienced extreme cold weather during the second ten days of January 2008,whereas the extraordinary persistence of the event might have occurred due to an anomalous blocking high in the Urals-Siberia region.Reflection of stratospheric planetary waves and its impact on tropospheric cold weather over Asia during January 2008 were investigated by applying two dimensional Eliassen-Palm （EP） flux and three-dimensional Plumb wave activity fluxes.The planetary wave propagation can clearly be seen in the longitude-height and latitude-height sections of the Plumb wave activity flux and EP flux,respectively,when the stratospheric basic state is partially reflective.Primarily,a wave packet emanating from Baffin Island/coast of Labrador propagated eastward,equatorward and was reflected over Central Eurasia and parts of China,which in turn triggered the advection of cold wind from the northern part of the boreal forest regions and Siberia to the subtropics.The wide region of Central Eurasia and China experienced extreme cold weather during the second ten days of January 2008,whereas the extraordinary persistence of the event might have occurred due to an anomalous blocking high in the Urals-Siberia region.

关 键 词：planetary wave reflection reflective index advection BLOCKING cold weather 

分 类 号：P434[天文地球—大气科学及气象学]