ANALYSIS OF “BIMODAL PATTERN” STORM ACTIVITY CHARACTERISTICS OF THE BAY OF BENGAL-中国期刊网

摘要 StormsthatoccurattheBayofBengal(BoB)areofabimodalpattern,whichisdifferentfromthatoftheotherseaareas.ByusingtheNCEP,SSTandJTWCdata,thecausesofthebimodalpatternstormactivityoftheBoBarediagnosedandanalyzedinthispaper.TheresultshowsthattheseasonalvariationofgeneralatmospherecirculationinEastAsiahasaregulatingandcontrollingimpactontheBoBstormactivity,andthe'bimodalperiod'ofthestormactivitycorrespondsexactlytotheseasonalconversionperiodofatmosphericcirculation.Theminorwindspeedofshearspringandautumncontributedtothestorm,whichwasacrucialfactorforthegenerationandoccurrenceofthe'bimodalpattern'stormactivityintheBoB.Theanalysisonseasurfacetemperature(SST)showsthattheSSTsofalltheyeararoundintheBoBareameettheconditionsrequiredforthegenerationoftropicalcyclones(TCs).However,theSSTsinthecentralareaofthebayarehigherthanthatofthesurroundingareasinspringandautumn,whichfacilitatestheoccurrenceofa'two-peak'stormactivitypattern.Thegenesispotentialindex(GPI)quantifiesandreflectstheenvironmentalconditionsforthegenerationoftheBoBstorms.ForGPI,theintenselow-levelvortexdisturbanceinthetroposphereandhigh-humidityatmospherearethesufficientconditionsforstorms,whilelargemaximumwindvelocityofthegroundvortexradiusandsmallverticalwindsheararethenecessaryconditionsofstorms.

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ANALYSIS OF “BIMODAL PATTERN” STORM ACTIVITY CHARACTERISTICS OF THE BAY OF BENGAL

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ANALYSIS OF “BIMODAL PATTERN” STORM ACTIVITY CHARACTERISTICS OF THE BAY OF BENGAL

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