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1、ClimateChangeResearchLetters气候变化研究快报,2017,6(4),227-237PublishedOnlineSeptember2017inHans.http://www.hanspub.org/journal/ccrlhttps://doi.org/10.12677/ccrl.2017.64024ImpactAnalysisoftheDryIntrusiononRainstormon1August2016inYiliRegionXiaomeiZhu,TingBai,TingXuYiliMeteorologicalBureau,YiliXinjia
2、ngththrdReceived:Jul.30,2017;accepted:Aug.12,2017;published:Aug.23,2017AbstractUsingNECP/NCARreanalysisdata,thepaperanalyzesalargescalecirculationbackgroundandtheconditionsofwatervaporoftheheavyrainprocessoccurredontheAugust1,2016intheYilire-gion,andusingtherelativehumidity,windvelocity,pot
3、entialvorticity,falsequitemoderatever-ticalvorticityandotherphysicalquantity,researchthemechanismandcharacteristicsofthedryintrusionintheheavyrainprocess,aswellastotheoccurrence,developmentandmaintenanceoftheimpactofthestorm.Theresultsshowthattheheavyprecipitationprocessisproducedinthebackg
4、roundofthelargescalecirculationoftheSouthAsiaHigheasterndevelopmentandtheWestPacificSubtropicalHighofthewestwardandnorthwardadvance.Thewatervaporismainlyfromthesouthernboundary,andthecontinuouswatervaporprovidesfavorableconditionsfortherainstorm.Affectedbydevelopmentofsoutherntrougheastward
5、,dryintrusionintheverticallev-elperformsaninvasionoftheuppertothelowertroposphere,horizontalmainperformsaninva-sionofthewesttotheeast,andhasthelong-termconfrontationofmoistairanddrycoldair;whenahighvaluevortexintheuppertroposphereofdryairintrudestolow-level,leadstolowervertic-alvorticityval
6、ueincreases,makinglow-levelconvergence,thestrengtheningofupwardmove-ment,whichisconducivetotheemergenceoflargeprecipitation.KeywordsDryIntrusion,Rainstorm,PotentialVorticity,SouthAsiaHigh,WesternPacificSubtropicalHigh干侵入对伊犁地区“2016.08.01”暴雨过程的影响分析祝小梅，白婷，徐婷伊犁州气象局，新疆伊犁文章引用:祝小梅,白婷,徐婷.干侵入对伊犁地区“2
7、016.08.01”暴雨过程的影响分析[J].气候变化研究快报,2017,6(4):227-237.DOI:10.12677/ccrl.2017.64024祝小梅等收稿日期：2017年7月30日；录用日期：2017年8月12日；发布日期：2017年8月23日摘要本文利用NECP/NCAR再分析资料，分析了2016年8月1日发生在伊犁地区一次暴雨过程的大尺度环流背景和水汽条件，运用相对湿度、风矢量、位势涡度、假相当位温和垂直涡度等多种物理量场，研究了该暴雨过程中干侵入的机制和特征，以及对暴雨发生、发展和维
