CAJ | 학술논문

利用盐城和合肥的多普勒雷达资料,分别对20030606发生于安徽定远县境内的下击暴流和20070725发生于江苏兴化市境内的下击暴流进行了研究分析.20030606的一系列下击暴流是发生于静止型多单体风暴中,地面上存在辐合切变线,西南气流提供充足的水汽,使得下击暴流持续进行;20070725的下击暴流是发生于弓状回波前部破裂的两个单体中,同时弓状回波前方的阵风锋上不断出现新生单体,对原风暴进行不断地补充,导致下击暴流连续产生.结果表明:(1)风暴单体顶高或强中心所在高度不断下降促使中层气流向下运动,引发地面下击暴流天气;(2)风暴单体与阵风锋相遇,有可能会产生下击暴流;(3)若风暴体垂直积分液态水含量(VIL)和风暴体雷达反射率因子极大值所在高度(CM)保持一个体扫(约6min)基本不变,表明风暴体已发展成熟,顶端即将崩溃、破碎,下击暴流即将产生,大约有6min 的预警时间.
이용염성화합비적다보륵뢰체자료,분별대20030606발생우안휘정원현경내적하격폭류화20070725발생우강소흥화시경내적하격폭류진행료연구분석.20030606적일계렬하격폭류시발생우정지형다단체풍폭중,지면상존재복합절변선,서남기류제공충족적수기,사득하격폭류지속진행;20070725적하격폭류시발생우궁상회파전부파렬적량개단체중,동시궁상회파전방적진풍봉상불단출현신생단체,대원풍폭진행불단지보충,도치하격폭류련속산생.결과표명:(1)풍폭단체정고혹강중심소재고도불단하강촉사중층기류향하운동,인발지면하격폭류천기;(2)풍폭단체여진풍봉상우,유가능회산생하격폭류;(3)약풍폭체수직적분액태수함량(VIL)화풍폭체뢰체반사솔인자겁대치소재고도(CM)보지일개체소(약6min)기본불변,표명풍폭체이발전성숙,정단즉장붕궤、파쇄,하격폭류즉장산생,대약유6min 적예경시간.
TwodownbursteventsinAnhuionJune6th,2003andinJiangsuonJuly25th,2007were analyzedrespectivelybasedonDopplerradardatacollectedfrom HefeiandYanchengradarsites.A serialofseverestormsaregrowingoutofmulticellstorms,accompanied withashearlineonthe groundandsufficientmoistureisprovidedbysouthwesterlyflowonJune6th,2003.Anothersevere stormisgrowingoutoftwonewcellstriggeredbythecrushedbowechostorm,andsustainedbynew cellsfromthegustfrontinfrontofthebowechoonJuly25th,2007.Theresultsshowthatthe obviousdroppingofreflectivityfactorcoreorcelltopcanproducedownwardtiltairflowsatmiddle levelsinthestorms,whichcanbeusedtoissuethedownburstwarning;adownburstmayinitiatedifa stormencounterswithashearline;ifCVIL (cellverticalintegratedliquidwatercontent)andCM (centroidofmass)keepstablein6min,adownburstwillgenerateduringthefollowingVCP (vertical coveragepattern)collectionwith6minwarning.