CAJ | 학술논문

利用常规观测资料、NCEP再分析资料和卫星云图产品，对2009年6月18-19日黑龙江省西南部地区的一次东北冷涡暴雨过程进行诊断分析，并利用WRF中尺度模式对暴雨过程进行数值模拟，分析产生暴雨的天气尺度和中尺度系统特征。结果表明：此次暴雨是由东北冷涡前部暖湿切变造成的，鄂霍次克海阻塞高压阻挡使冷涡移动缓慢，冷涡系统影响时间长，降水量增大。暖湿空气在切变处强烈辐合上升，为暴雨产生提供了动力条件；低空偏南急流为暴雨提供充沛的水汽条件，同时低层增温增湿使大气层结不稳定。低层强辐合区与高层强辐散区重叠，易产生强烈的上升运动，有利于深对流的发展和中尺度系统的生成及维持。此次暴雨是由暖锋云带中多个对流云团的发展移动造成的，地面中尺度切变线为暴雨云团的发展和维持提供了有利条件。数值模拟结果显示，此次暴雨是由两次中尺度切变线先后在同一区域的发展和移动造成的；切变线上存在与暴雨关系密切的中尺度垂直环流。
이용상규관측자료、NCEP재분석자료화위성운도산품，대2009년6월18-19일흑룡강성서남부지구적일차동북랭와폭우과정진행진단분석，병이용WRF중척도모식대폭우과정진행수치모의，분석산생폭우적천기척도화중척도계통특정。결과표명：차차폭우시유동북랭와전부난습절변조성적，악곽차극해조새고압조당사랭와이동완만，랭와계통영향시간장，강수량증대。난습공기재절변처강렬복합상승，위폭우산생제공료동력조건；저공편남급류위폭우제공충패적수기조건，동시저층증온증습사대기층결불은정。저층강복합구여고층강복산구중첩，역산생강렬적상승운동，유리우심대류적발전화중척도계통적생성급유지。차차폭우시유난봉운대중다개대류운단적발전이동조성적，지면중척도절변선위폭우운단적발전화유지제공료유리조건。수치모의결과현시，차차폭우시유량차중척도절변선선후재동일구역적발전화이동조성적；절변선상존재여폭우관계밀절적중척도수직배류。
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.