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一次罕见小雨转暴雪天气环流特征分析(英文).docx

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一次罕见小雨转暴雪天气环流特征分析(英文) AnalysisofWeatherCirculationFeaturesduringRareSmallRainTurningintoHeavySnowstorm Introduction: Insomeregions,itisnotuncommonforsmallrainandsnowfalltooccur,however,itisrareforsmallraintoturnintoaheavysnowstorm.Thispaperaimstoanalyzetheweathercirculationfeaturesthatleadtosucharareoccurrence.Theanalysisisbasedondatacollectedfromvariousweatherstationsandsatelliteimaging. WeatherCirculationFeatures: Theprocessofsmallrainturningintoaheavysnowstormisaresultofcomplexweathercirculationfeatures.Thesefeaturesincludeaconvergenceofcoldairmasses,upliftofwarmandmoistair,andastronglow-pressuresystem.Theconvergenceofcoldairfromthenorthandwestpushesthewarmandmoistairmassupward,creatinginstabilityintheatmosphere.Astheairmassgainsaltitude,itcools,andhumidityincreases,leadingtotheformationofclouds.Thesecloudsstarttoreleasesmallraindroplets. Asthesmallraindropletsfalldown,theyencounterathickerlayerofcoldair,whichfreezesthem,turningthemintosnowflakes.Inaddition,theairmasscontinuestocool,causingthemoisturecontenttoincrease,leadingtotheformationofmoresnowflakes.Theriseinmoisturecontentisfurtherfacilitatedbyastronglow-pressuresystem.Thelow-pressuresystemenhancestheconvergenceofcoldairandtheupliftofwarmandmoistair,furtherincreasingatmosphericinstability. Satelliteimagingshowsthatduringtheformationofsuchweather,astrongfrontseparatesthecoldandwarmairmasses.Thewinddirectionintheloweratmospherechangesfromsoutherlytonortherlyasthecoldairmassmovesfromthenorthtothesouth.Thewinddirectionintheupperatmospherechangesfromwesterlytoeasterly.Thisshowsthattheconvergenceofthecoldandwarmairmassesisnotinfluencedbyasingleatmosphericevent,butvariousatmosphericfeaturessuchastemperature,pressure,humidity,andwinddirection. TheRoleofLocalTopography: Localtopographyplaysacriticalroleintheformationofsmallrainturningintoaheavysnowstorm.Satelliteimaginganddatacollectedfromweatherstationsshowthatareaswithahigherelevationexperiencethesnowfall,whileareasataloweraltitudeexperiencelightrain.Thiscanbeexp