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《Journal of Arid Meteorology》 2015-05
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Analysis of a Heavy Snow Process in the Middle of Shanxi Province on 19 April 2013

YAN Hui;ZHAO Guixiang;ZHANG Chaoming;ZHAO Ying;BO Yanqing;Shanxi Meteorological Observatory;Shanxi Atmospheric Sounding Technical Support Center;  
Using the conventional meteorological data and NCEP reanalysis data,the heavy snow process in the middle of Shanxi Province on 19 April 2013 was analyzed. The results show that the co- existence of plateau trough on 500 h Pa,low vortex shear line at low level,ground return airflow and Hetao cyclone provided advantageous flow pattern configuration for snowstorm. The southwest jet( SWJ) on 700 h Pa,the southeast jet( SEJ) on 850 h Pa and the eastly jet( EJ) on 925 h Pa provided the strong water vapor transport and supplement together. The coupling of the northwest jet( NWJ) on 500 h Pa and northeasterly severe airflow on 850 h Pa,the positive vorticity transport at high level,the tilt vertical structure of lower- level convergence and upper- level divergence made ascending motion enhancement and triggered the release of unstable energy at low level,which led to occurrence of the snowstorm. The change of low level and near surface temperature,the drop of 0 ℃ level height,increase of inversion layer depth and vertical wind shear were important indexes to judge the change of precipitation phases and enhance of snowfall intensity during the process.
【Fund】: 国家自然科学基金项目“华北锢囚锋大(暴)雪天气结构特征及其预报技术研究”(41075030)资助
【CateGory Index】: P458.121.1
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