摘要
In2005,significantrainfallreinforcementandseveredisasterwasinducedbytropicalcyclone(TC)TalimafteritmadelandfallontheeastofChina.Observationalanalysesshowthatithasrelationshipwithcoldairintrusion.Forinvestigatingtheimpactofcoldairintensity,wemakeuseofWeatherResearchandForecasting(WRF)model,thesynthesizerofNCEP/NCARreanalysisdataandJapanregionalspectralmodeldata,tocarryoutnumericalexperiments.Resultsshowthatrainfallreinforcementoccursinallexperiments.Differentintensityofcoldaircanmodifytherainfalldistributionandintensitysignificantly.Intherainfallcenter,theincrementmaximumofrainfallistwiceaslargeasthatoftheminimum.Moderatecoldairintrusionmayresultinthestrongestrainfallreinforcement.Differentcoldairintensitycanleadtodifferentmotionoflow-levelconvergencelinesandfronts.Thereisagoodrelationshipbetweentherainfallregionandtheeasternpartofthefront.Ononehand,strongcoldairweakenstheTCintensitybyitsintrusionintotheTCcenterandresultsinweakconvergenceandaconvergentzoneandarainbandshiftedsouthward.Ontheotherhand,weakcoldairreducestheconvergenceandmovestheconvergentzoneandrainbandnorthward.Moderatecoldairintrusionmaintainsstronglow-levelconvergenceandhigh-leveldivergence,keepingstrongupwardmotionovercertainregions.Consequently,therainbandbeginstostagnateandrainfallreinforcesabruptlytherein.
出版日期
2013年01月11日（中国期刊网平台首次上网日期，不代表论文的发表时间）
