CAJ | 학술논문

使用阜阳多普勒天气雷达、安徽省气象自动观测网、卫星云图等资料,对2007年7月8日发生在阜阳市迎仙镇的一次极端降雨事件进行了综合分析.结果表明,这场特大暴雨是在西太平洋副热带高压向南撤退形势下发生的,大气层结主要表现为强的对流性不稳定,特大暴雨对流云带恰好发生在低层辐舍区、高层辐散区,并且和850 hPa典型的静止锋式切变线相对应;特大暴雨由狭窄而持续强盛的对流性回波带形成.切变线的组织作用使得新生回波单体不断地聚合到回波带中,是维持回波带持续强盛的原因.回波单体移动方向和回波带的走向接近一致造成迎仙持续的强降水.
사용부양다보륵천기뢰체、안휘성기상자동관측망、위성운도등자료,대2007년7월8일발생재부양시영선진적일차겁단강우사건진행료종합분석.결과표명,저장특대폭우시재서태평양부열대고압향남철퇴형세하발생적,대기층결주요표현위강적대류성불은정,특대폭우대류운대흡호발생재저층복사구、고층복산구,병차화850 hPa전형적정지봉식절변선상대응;특대폭우유협착이지속강성적대류성회파대형성.절변선적조직작용사득신생회파단체불단지취합도회파대중,시유지회파대지속강성적원인.회파단체이동방향화회파대적주향접근일치조성영선지속적강강수.
Using the comprehensive information of Fuyang radar echoes,automatic weather observation networks and satellite cloud images,an extreme precipitation event at YingxJan town,Fuyang city on 8th July 2007(20070708)is analyzed.Based on the data from the dense meteorological observation network and the statistical data of radar echoes,the rainstorm facts are first revealed. The synoptic analysis of the event data shows that the rainstorm happened in a southward withdrawal process of the west Pacific sub-tropical high,when the atmospheric temperature stratification was strongly convectively unstable.The convective cloud band producing the torrential rain was vertically in a convergent area at low level in the conjunction of a divergent area aloft,and its location coincided with an 850 hPa shear line of stationary front type;and the rainstorm formed within a nalTow and persistently strong convective echo band.The shear line continuously organized new echo cells into the echo band,thus keeping it strong and persistent for ten hours,and the motion direction of echo cells,approximately consistent with the orientation of the strong echo band,enhanced the precipitation intensity of the rainstorm at Yingxian.