气象与环境学报Issue(4)：19-25,7.DOI:10.3969/j.issn.1673-503X.2014.04.003
一次东北冷涡暴雨数值模拟及动力诊断分析
Numerical simulation on a rainstorm process caused by Northeast China cold vortex and its diagnostic analysis
摘要
Abstract
Based on conventionally observational data,the NCEP reanalysis data and satellite cloud image,a rain-storm process caused by Northeast China cold vortex in the southwest of Heilongjiang province on June 18-19, 2009 was analyzed and simulated by a WRF numerical model.The effects of weather system and mesoscale charac-teristics were discussed.The results indicate that the heavy rain is caused by warm-wet shear in front of Northeast China cold vortex.Cold vortex moves slowly because of impeding effect of Okhotsk high,which leads to increase of precipitation.The strong convergence and updraft of strong southeast warm-wet airflow on the shear provide dy-namic conditions for the heavy rain,while low-level jets supply abundant water vapor for the heavy rain.The in-crease of temperature and humidity in the low level makes atmospheric stratification unstable.Low strong conver-gence area and upper strong divergence area overlay,which consequently leads intense ascending movement.It provides conditions of deep convection development and promotes the formation and maintenance of mesoscale system when heavy rain occurs.Rainstorm is caused by development and movement of several mesoscale cloud clusters that is in the cloud belt of warm front.The mesoscale convergence line on the ground provides the advanta-geous conditions for the development and maintenance of mesoscale cloud clusters.The numerical simulation result suggests that rainstorm happens because two mesoscale shear lines develop and move successively in the same re-gion.There is a mesoscale vertical circulation which is related to rainstorm on the mesoscale shear line.关键词
东北冷涡/次级环流/中尺度切变线/数值模拟/暴雨Key words
Northeast China cold vortex/Secondary circulation/Mesoscale shear line/Numerical modeling/Rain-storm分类
天文与地球科学引用本文复制引用
任丽,杨艳敏,金磊,韩冰,关铭..一次东北冷涡暴雨数值模拟及动力诊断分析[J].气象与环境学报,2014,(4):19-25,7.基金项目
公益性行业（气象）科研专项（GYHY201006006-04）、黑龙江省气象局科学技术研究项目（HQ2013002）和中国气象局预报员专项（CMAYBY2014-019）共同资助。 （）
