CAJ | 학술논문

2013年8月21日，青海西宁大通县桥头镇出现了创历史极值的大暴雨天气过程，此次暴雨的降水空间集中，降水量大，实为罕见。利用常规天气图实况资料、NCEP 分析场资料、多普勒雷达探测资料进行分析，结果表明：（1）副热带高压稳定维持，引导西南暖湿气流北上，新疆脊前下滑的短波槽携带冷空气南下，冷暖空气在青海东北部交绥，为大通特大暴雨提供了有利的环流条件。（2）暴雨发生过程中有强盛的水汽输送和水汽通量输送；暴雨区水汽的辐合以及暴雨发生前大气热力不稳定为暴雨的发生提供了条件。（3）对流云团在东移南压过程中依次经过大通县城，表现为列车效应，并对应此次最大小时降雨量。径向速度场在大通地区存在着风场辐合，这种形式对本次强降水的持续提供了有利的动力条件；VIL 数值的大小很好的反映了降水强度，VIL 的大小、影响范围和移动方向对应降水强度、发展及消亡；雷达降水量图对本次强降水过程的降水量及落区有一定指示意义。
2013년8월21일，청해서저대통현교두진출현료창역사겁치적대폭우천기과정，차차폭우적강수공간집중，강수량대，실위한견。이용상규천기도실황자료、NCEP 분석장자료、다보륵뢰체탐측자료진행분석，결과표명：（1）부열대고압은정유지，인도서남난습기류북상，신강척전하활적단파조휴대랭공기남하，랭난공기재청해동북부교수，위대통특대폭우제공료유리적배류조건。（2）폭우발생과정중유강성적수기수송화수기통량수송；폭우구수기적복합이급폭우발생전대기열력불은정위폭우적발생제공료조건。（3）대류운단재동이남압과정중의차경과대통현성，표현위열차효응，병대응차차최대소시강우량。경향속도장재대통지구존재착풍장복합，저충형식대본차강강수적지속제공료유리적동력조건；VIL 수치적대소흔호적반영료강수강도，VIL 적대소、영향범위화이동방향대응강수강도、발전급소망；뢰체강수량도대본차강강수과정적강수량급락구유일정지시의의。
August 21 ,2013 ,a record extremes of heavy rain process appeared in Datong Country of Xin-ing Qinghai province .The concentration of precipitation space ,heavy precipitation of this process is rare . Using conventional weather charts ,NCEP analysis of field data ,Doppler radar data were analyzed ,the re-sults show :(1 )remained stable subtropical high ,guide the southwest warm and damp airflow towards Northward ,the results of the falling short wave trough before Xinjiang ridge to carry cold air southward , the interaction of cold and warm air in northeastern Qinghai ,which provides favorable circulation condi-tions for this heavy rainfall in Datong .(2)there are powerful water vapor trasport and vapor flux transport in this rainstorm ;rainstorm moisture convergence zone and pre - storm atmospheric instability provide conditions for the occurence of rainstorm .(3)convective clouds in the process turn eastward and southward through Morgan County ,expressed as the train effect ,and corresponds to the maximum hourly rainfall .Ra-dial velocity field in Datong area exists wind convergence ,this form provide favorable conditions for this rainfall persistence ;VIL value of a good size reflects the intensity of preciptation ,VIL size ,influence scope and direction movement corresponds to the intensity of precipitation ,development and demise ;radar rainfall figure indicates a certain significant to this drop zone in the heavy rainfall process .