简介：Weanalyzedcloudmicrophysicalprocesses’latentheatcharacteristicsandtheirinfluenceonanautumnheavyraineventoverHainanIsland,China,usingthemesoscalenumericalmodelWRFandWRF-3DVARsystem.Wefoundthatpositivelatentheatoccurredfarabovethezerolayer,whilenegativelatentheatoccurredmainlyunderthezerolayer.Therewassubstantiallymorepositivelatentheatthannegativelatentheat,andthecondensationheatinghadthemostimportantcontributiontothelatentheatincrease.Theprocessesofdeposition,congelation,meltingandevaporationwereallcharacterizedbyweakeningaftertheirintensification;however,thevariationsincondensationandsublimationprocesseswererelativelysmall.Themaincloudmicrophysicalprocessesforpositivelatentheatwerecondensationofwatervaporintocloudwater,thecondensationofrain,andthedepositionincreaseofcloudice,snowandgraupel.Themaincloudmicrophysicalprocessesfornegativelatentheatweretheevaporationofrain,themeltingandenhancedmeltingofgraupel.Thelatentheatreleasesduetodifferentcloudmicrophysicalprocesseshaveasignificantimpactontheintensityofprecipitation.Withoutthecondensationandevaporationofrain,thetotallatentheatingwoulddecreaseandthemoisturevariablesandprecipitationwouldreducesignificantly.Withoutdepositionandsublimation,theheatinginhighlevelswoulddecreaseandtheprecipitationwouldreduce.Withoutcongelationandmelting,thelatentheatingwouldenhanceinthelowlevels,andtheprecipitationwouldreduce.