气象2016，Vol.42Issue(4)：406-414,9.DOI:10.7519/j.issn.1000-0526.2016.04.003
两次引发辽宁暴雪过程低涡的动力发展机制
Dynamic Diagnosis on Formation and Developing Mechanism of Two Vortices Causing Snowstorms in Liaoning
摘要
Abstract
By using National Centers for Environmental Prediction (NCEP)Final (FNL)operational global analysis data,the formation and developing mechanisms of the two vortices that caused snowstorms,on 16 and 25 February 2015 are investigated in terms of dynamics diagnosis.The results show that the formation and strengthening of vortices are the direct causes for the snowstorms,but the associated mechanisms are quite different in the two snowstorm cases.Positive tendencies of relative vorticity caused by convergence in lower troposphere and vertical transportation are the mainly forcing items for the formation of vortices in the two cases,respectively.On 16 February,there was a vortex moving eastward at 500 hPa.The cold advection near the bottom of the vortex deepened the trough at 500 hPa and the positive vorticity advection strengthened.Therefore,the increase of differential vorticity advection resulted in the developing of upward motion,and then the enhancement of the convergence at 850 hPa.On the other hand,on 25 February,the vertical vorticity transport by strong upward movement was the maj or developing mechanism of the vortex at 850 hPa.关键词
低涡/暴雪/动力机制/涡度变率/涡度平流Key words
vortex/snowstorm/dynamic mechanism/total vorticity source/vorticity advection分类
天文与地球科学引用本文复制引用
阎琦,温敏,陆井龙,李爽,田莉..两次引发辽宁暴雪过程低涡的动力发展机制[J].气象,2016,42(4):406-414,9.基金项目
辽宁省科技厅农业攻关及成果产业化项目（2014210003）和国家重点基础研究发展计划（973计划）（2012CB417205）共同资助 （）
