CAJ | 학술논문

2012年7月29日13时至30日03时河西走廊中部遭遇暴雨袭击，利用常规高空和地面资料、区域加密雨量站资料、FY-2静止卫星云图以及6 h一次1°×1°的 NCEP再分析资料，对此次暴雨发生前后的天气环流背景及影响系统、物理量特征和卫星云图以及中尺度系统的发生发展进行了天气学综合诊断分析。结果表明：此次暴雨发生在非常有利的大尺度天气背景下，高、低层均为“东高西低”的流场配置，影响的环流系统是巴尔喀什湖冷槽，暴雨发生时高层辐散、低层辐合，形成了强烈的抽吸作用；对流层内出现强烈的上升运动，中低层流场的配置有利于水汽的输送和汇聚；500 hPa垂直螺旋度的分布与天气系统和强降水有很好的对应关系，700 hPa柴达木暖性低涡及地面中尺度系统为不稳定能量的储存和暴雨提供了动力条件，从兰州至河西的强暖湿平流的发展为暴雨提供了热力条件；暴雨发生期间有多个中尺度对流云团在该区域上空活动，表明暴雨过程中存在明显的中小尺度系统。
2012년7월29일13시지30일03시하서주랑중부조우폭우습격，이용상규고공화지면자료、구역가밀우량참자료、FY-2정지위성운도이급6 h일차1°×1°적 NCEP재분석자료，대차차폭우발생전후적천기배류배경급영향계통、물리량특정화위성운도이급중척도계통적발생발전진행료천기학종합진단분석。결과표명：차차폭우발생재비상유리적대척도천기배경하，고、저층균위“동고서저”적류장배치，영향적배류계통시파이객십호랭조，폭우발생시고층복산、저층복합，형성료강렬적추흡작용；대류층내출현강렬적상승운동，중저층류장적배치유리우수기적수송화회취；500 hPa수직라선도적분포여천기계통화강강수유흔호적대응관계，700 hPa시체목난성저와급지면중척도계통위불은정능량적저존화폭우제공료동력조건，종란주지하서적강난습평류적발전위폭우제공료열력조건；폭우발생기간유다개중척도대류운단재해구역상공활동，표명폭우과정중존재명현적중소척도계통。
For the process of the rainstorm occurred in central Hexi Corridor from 13:00 29 to 03:00 30 July 2012,based on the con-ventional aerological sounding and surface data,intensive regional rainfall data,FY-2 satellite cloud imagery and NCEP reanalysis data at 1° × 1° spatial and 6 hours temporal resolution,the weather circulation pattern,the influence system,physical parameters char-acteristics,satellite cloud imagery and mesoscale system of the rainstorm before and later were analyzed by the synoptic diagnostic method. The results showed that the rainstorm occurred in the context of favorable large scale weather conditions. The flow field presen-ted the pattern of“high in the east and low in the west”in high and low layer of the sky,and the Balkhash Lake cold trough brought out the occurrence of the rainstorm. When the rainstorm happened,an intensive pumping action formed due to the upper layer diver-gence and lower layer convergence,at the point the strong ascending motion appeared in the troposphere,so the flow field pattern was favorable for the transport and gather of moisture. The 500 hPa vertical distribution of helicity was corresponding with the weather sys-tem and strong precipitation. The 700 hPa Qaidam warm vortex and the mesoscale weather system on ground provided dynamic condi-tions for unstable energy storage and the rainstorm,and the development of strong warm advection from Lanzhou to Hexi Corridor of-fered thermal conditions. Furthermore,the mesoscale and microscale weather systems were obvious during the period of the torrential rain.