A Study on a Heavy Rainfall Event Triggered by an Inverted Typhoon Trough in Shandong Province-中国Betway体育网页登陆

摘要 AheavyrainfalleventthatoccurredinShandongProvincein26-28August2004wascausedmainlybyTyphoonAereandcoldairactivitiesrelatedtoawesterlytrough.Theeventwastriggeredbyaninvertedtyphoontrough,whichwascloselyassociatedwiththeintensificationofthelow-levelsoutheasterlyflowandthenorthwardtransportofheatandmomentumintheperipheryofthetyphoonlow.AnumericalsimulationofthiseventisperformedusingthenonhydrostaticmesoscalemodelMM5withtwo-wayinteractiveandtriply-nestedgrids,andthestructureoftheinvertedtyphoontroughisstudied.Furthermore,theformationanddevelopmentmechanismoftheinvertedtyphoontroughandamesoscalevortexarediscussedthroughavorticitybudgetanalysis.Theresultsshowthattheheavyrainfallwasinducedbythestrongconvergencebetweenthestrongandweakwindswithintheinvertedtyphoontrough.Dynamiceffectsofthelow-leveljetandthediabaticheatingofprecipitationplayedanimportantroleinthedevelopmentoftheinvertedtyphoontroughandtheformationofthemesoscalevortex.Thevorticitybudgetanalysissuggeststhatthedivergenceterminthelowtroposphere,thehorizontaladvectionterm,andtheconvectionterminthemiddletroposphereweremaincontributorstopositivevorticity.Nonetheless,atthesamepressurelevel,theeffectofthedivergencetermandthatoftheadvectiontermwereoppositetoeachother.Inthemiddletroposphere,theverticaltransporttermmadeapositivecontributionwhilethetiltingtermmadeanegativecontribution,andthetotalvorticitytendencywasthenetresultoftheircounteractions.Itisfoundthatthechangetendencyoftherelativevorticitywasnotuniformhorizontally.Astrongpositivevorticitytendencyoccurredinthesoutheastofthemesoscalevortex,whichiswhytheheavyrainfallwasconcentratedthere.Theincreaseofpositivevorticityinthelow(upper)tropospherewascausedbyhorizontalconvergence(upwardtransportofvorticityfrom

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A Study on a Heavy Rainfall Event Triggered by an Inverted Typhoon Trough in Shandong Province

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