STATISTICAL ANALYSIS OF SUMMER TROPICAL CYCLONE REMOTE PRECIPITATION EVENTS IN EAST ASIA FROM 2000 TO 2009 AND NUMERICAL SIMULATION

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摘要 Using1°×1°finalanalysis(FNL)datafromtheNationalCentersforEnvironmentalPrediction(NCEP),precipitationdatafromtheTropicalRainfallMeasuringMission(TRMM)andthebest-tracktropicalcyclone(TC)datasetprovidedbytheJapanMeteorologicalAgency(JMA)forJune-Augustof2000-2009,wecomprehensivelyconsiderthetwofactorslow-levelmoisturechannelandinteractionbetweenTCsandmid-latitudesystemsandimplementastatisticalanalysisofremoteprecipitationinEastAsiatothenorthof0°andtothewestof150°E.48casesofremoteprecipitationoccurredinthisperiod,whicharecategorizedintofiveclasses.Afteracompositeanalysisofthedifferentclasses,themainsystemsat850hPaand500hPathatimpacttheremoteprecipitationareasfollows:TC,mid-latitudetrough,subtropicalhighandwatervaporchannel.Inparticular,thewatervaporchannelwhichusuallyconnectswithIndianmonsoonhasthemostsignificantimpactonremoteheavyrainfall.Anotherimportantfactoristhemid-latitudetrough.Thetypeofnorthtrough/vortex-southTCremoteprecipitationeventshappenmostfrequently,accountingfor68.8%ofthetotalincidence.MostremoteprecipitationeventsoccurontherightsideoftheTCpath(representing71%ofthetotalnumber).At200hPa,theremoteprecipitationeventsusuallyoccurontherightrearportionofahigh-altitudejetstream,andthereisananti-cyclonicvortextotheeastandwestoftheTCs.Whenthereisnoanti-cyclonicvortextotheeastoftheTC,theTCisrelativelyweak.WhentheremoteprecipitationoccurstothenorthwestoftheTCandthereisatroughinthenorthwestdirection,theTCisrelativelystrong.NumericalexperimentsarecarriedoutusingWeatherResearchandForecast(WRF)model.TheresultsshowsthattheTCplaysamainroleinproducingtheheavyprecipitationandresultsintheenhancementofprecipitationbyimpactingthewatervaporchannel.
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出版日期 2017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)
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