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《Chinese Journal of Atmospheric Sciences》 2011-01
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Cold Vortex over Northeast China and Its Climate Effect

HU Kaixi1,2,3,LU Riyu1,2,and WANG Donghai4 1 Center for Monsoon System Research,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100080 2 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029 3 National Meteorological Information Center,Beijing 1000814 State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,Beijing 100081  
Based on the long-term dataset of cold vortex over Northeast China derived from automatic method of detection and track,interannual variability of cold vortex over Northeast China,the effect of its persistent activities on regional climate,and the associated large-scale circulation anomalies are investigated.The results show that the cold vortex has a considerable interannual variability,but no significant long-term trends.Persistent activities of cold vortex have a major oscillation with a period of about 2.5 a.Frequent occurrences of cold vortex can cause a significant negative air temperature anomaly over Northeast China for all seasons and lead to more local rainfall in spring and summer seasons.There are likely more rainfalls over the Yangtze River basin when the summer cold vortex is more frequent.In winter when the cold vortex occurs more frequently,most of China experiences lower air temperature and less rainfall,which is highly related to strong East Asian winter monsoon.In the summer of more cold vortices,deep dipole-like geopotential height anomaly maintains over East Asia,the upper-level jet stream shifts southward and is strengthened slightly,and the lower-tropospheric anticyclonic anomaly over the western North Pacific and the easterly anomaly over high latitudes facilitate the water vapor flux to be convergent over the Yangtze River basin and Northeast China,respectively.
【Fund】: 国家自然科学基金资助项目40633016、40725016
【CateGory Index】: P461
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