CAJ | 학술논문

利用丹东多普勒雷达的基本反射率、基本径向速度和风廓线资料,对2010年8月19日和20日丹东地区大暴雨天气过程进行分析,探讨丹东短时强降水天气形势和多普勒雷达回波特征。结果表明：在丹东处于副热带高压内部或边缘时,南下的冷空气与副热带高压后部暖湿空气势力相当时,形成丹东地区较典型的暴雨模式。风廓线产品在强降水前期,会产生一个水汽累积的过程,两次过程中出现短时强降雨时段均表现为高空急流出现和高空动量下传。这种高空动量的下传使低空急流得到加强,低层进一步辐合,使雨强明显增大。两次过程中降水回波区均形成一条40 dBz以上的回波带,回波移动方向与回波带轴向一致,导致沿途站降水时间偏长,降水总量偏多。逆风区出现时间与强降雨时段有较好的配合,其位置与强回波区的对应关系揭示出逆风区厚度越大、对应的反射率因子强度越强,产生的降水强度也越大。
이용단동다보륵뢰체적기본반사솔、기본경향속도화풍곽선자료,대2010년8월19일화20일단동지구대폭우천기과정진행분석,탐토단동단시강강수천기형세화다보륵뢰체회파특정。결과표명：재단동처우부열대고압내부혹변연시,남하적랭공기여부열대고압후부난습공기세력상당시,형성단동지구교전형적폭우모식。풍곽선산품재강강수전기,회산생일개수기루적적과정,량차과정중출현단시강강우시단균표현위고공급류출현화고공동량하전。저충고공동량적하전사저공급류득도가강,저층진일보복합,사우강명현증대。량차과정중강수회파구균형성일조40 dBz이상적회파대,회파이동방향여회파대축향일치,도치연도참강수시간편장,강수총량편다。역풍구출현시간여강강우시단유교호적배합,기위치여강회파구적대응관계게시출역풍구후도월대、대응적반사솔인자강도월강,산생적강수강도야월대。
Based on the basic reflectivity,basic radial velocity and wind profile data from Doppler radar,two heavy rain processes in Dandong area on August 19 and 20,2010 were analyzed,and their weather situations and radar echo characteristics were discussed.The results indicate that the forces of southward cold air and warm wet air of the rear subtropical high are compatible when Dandong is located within subtropical high or near the margin,so it comes into being a typical heavy rain model in Dandong.The VWP(vertical wind profile) has a water vapor accumulation process during the prophase of precipitation,and it shows that upper level jet stream appears and upper momentum transports downward during the short-time heavy rain of two processes.The downward transportation of upper momentum makes lower level jet stream strengthened and the lower level converges,so rain intensity increases obviously.An echo strip with 40 dBz is formed in the precipitation echo areas of two processes,and the echo moving direction is consistent with the echo axial direction,which makes precipitation time prolonged and rainfall intensity increased.The occurrence time of inverse wind area is corresponding with that of the short-time strong rainfall.The corresponding relationship between the location of inverse wind area and strong echo area suggests that the larger the thickness of inverse wind area is,the stronger the corresponding reflectivity factor is,and so rainfall intensity is also strong.