文档介绍：该【1.4975532参考论文参考论文资料 】是由【学习一点】上传分享，文档一共【5】页，该文档可以免费在线阅读，需要了解更多关于【1.4975532参考论文参考论文资料 】的内容，可以使用淘豆网的站内搜索功能，选择自己适合的文档，以下文字是截取该文章内的部分文字，如需要获得完整电子版，请下载此文档到您的设备，方便您编辑和打印。Lidarobservationsoflow-levelwindreversalsovertheGulfofLionandcharacterizationoftheirimpactonthewatervapourvariabilityPaoloDiGirolamo,CyrilleFlamant,iani,DonatoSumma,DarioStelitano,EvelyneRichard,VéroniqueDucrocq,NadiaFourrie,andFrédériqueSaidCitation:AIPConferenceProceedings1810,080001(2017);Viewonline:https:///:http://aip./toc/apc/1810/1PublishedbytheAmericanInstituteofPhysicsArticlesyoumaybeinterestedinMonthlycovariabilityofAmazonianconvectivecloudpropertiesandradiativediurnalcycleAIPConferenceProceedings1810,070002(2017);-trainsatelliteobservationsAIPConferenceProceedings1810,070001(2017);,070008(2017);,H2O,HDO,O3,minorandtracegasesAIPConferenceProceedings1810,060004(2017);-arrayspectrometerAIPConferenceProceedings1810,080003(2017);,070007(2017);-levelwindreversalsovertheGulfofLionandcharacterizationoftheirimpactonthewatervapourvariabilityPaoloDiGirolamo1,a),CyrilleFlamant2,b),iani3,DonatoSumma1,DarioStelitano1,EvelyneRichard4,VéroniqueDucrocq5,NadiaFourrie5,FrédériqueSaid41ScuoladiIngegneria,UniversitàdegliStudidellaBasilicata,Vialedell',85100Potenza-Italy2LaboratoireAtmosphères,Milieux,ObservationsSpatiales,RS&UPMC&UVSQ,Paris-France3DipartimentodiFisica,UniversitàdiRoma“Sapienza”,PiazzaleAldoMoro,,00100Roma–Italy4Laboratoired'Aérologie,RS,UniversitédeToulouse,Toulouse,France5CNRM-GAME,UMR3589Météo-RS,Toulouse,Francea)Correspondingauthor:******@)cyrille.******@-basedRamanlidarandanairbornedifferentialabsorptionlidar,complementedbyhighresolutionnumericalsimulationsfromtwomesoscalemodels(Arome-WMEDandMESO-NH),areconsideredtoinvestigatetransitioneventsfromMistral/osoutherlymarineflowtakingplaceovertheGulfofLioninSouthernFranceinthetimeframeSeptember-October2012,duringtheHydrologicalCycleintheMediterraneanExperiment(HyMeX)SpecialObservationPeriod1(SOP1).Low-levelwindreversalsassociatedwiththesetransitionsarefoundtohaveastrongimpactonwatervapourtransport,-dimensionalwatervapourfieldduringthesetransitionsfrompredominantlynortherlyMistral/Tramontaneflowtoapredominantlysoutherlyflow,allowingtoidentifythequitesharpseparationbetweentheseflows,,,frequentlylastsseveraldays,(amongothers,[1]).IntheGulfofLion,SouthernFrance,,rationbeingstronglydependentonthelargescaleflow[2].DuringHyMeX-SOP1(September-November2012)severaleventswhenthesoutherlymarineflowbrokethroughandovercametheMistral/[3].Thisresearcheffortisdedicatedtothemeasurementsperformedbytheground-basedUniversityofBASILicataRamanLidarsystem(BASIL,[4])andtheairbornedifferentialabsoptionlidar(DIAL)systemLEANDRE2[5],whichareusedtoillustratethehightimeandurrenceoftransitioneventsfromRadiationProcessesintheAtmosphereandOcean(IRS2016),080001-1–080001-4;doi:.978-0-7354-1478-5/$-1Mistral/osoutherlymarineflowinSouthernFranceduringHyMeX--NHandthemesoscalenumericalweatherpredictionmodelAROME--basedRamanLidarhostedinatransportablesea--uratemeasurementsofatmospherictemperatureandwatervapour,bothindaytimeandnight-time,basedontheapplicationoftherotationalandvibrationalRamanlidartechniquesintheUV[4,6,7].Besidestemperatureandwatervapour,BASILisalsocapableofprovidingmeasurementsofparticlebackscatterat355,532and1064nm,particleextinctionat355and532nmandparticledepolarizationat355and532nm[8,9].IntheframeofHyMeX-SOP1,BASILwasdeployedinCandillarguesandoperatedbetween5Septemberand5November2012,collectingmorethan600hoursofmeasurements,distributedover51measurementdaysand19intensiveobservationperiods(IOPs).DuringHyMeX-SOP1,RSDIAL-LEANDRE2waslocatedonboardtheFrenchATR42,-–vibrationbandsinthenearinfrared(727–770nm).-í1nearthesurfaceforanalong-umulationof100individualprofiles,which,foranART42flyingspeedof100m/s,correspondstoanalong-,RSDIALperformedover60flighthours:8ofwhichsupportedbytheEuropeanFacilityForAirborneResearchProject“WaLiTemp”andincoordinationwiththeRamanlidarBASIL,-hydrostaticmodels:Méso-NHandAROME-éso-NHhasbeenjointlydevelopedbytheLaboratoired'RM-,-WMEDisaconvection-permittingmodelwithadomaincoveringtheentirewesternMediterraneanbasin,-hdataassimilationcycle,themodelassimilatessomeoftheobservationsmadeavailableinreal-timeduringSOP1(,radiosoundingsfromtheresearchsites,radardata(Dopplerwindsandreflectivity)andsatellitedata).RESULTSFigure1illustratesthetimeevolutionofthewinddirectionandspeedandrelativehumidityfortheperiodfrom00:00UTon19September2012to00:/Tramontaneeventaround08:00UTon20September2012,withwinddirectionprogressivelychangingfromabout0toabout150degrees(fromNortherlytoSouth-easterly),%.:49UTon19September2012to16:-::,duringtheMistral/Tramontaneflow,themixingratiovaluesintheboundarylayerarenotexceeding5-6g/,withmixingratiovaluesaslargeas15g/,withmixingratiovaluesnotexceeding3g/kg,bothbeforeandafterthearrivalofthe080001-2flow,mainlybecausethewindreversalistakingplaceonlyinthelowerlevels(primarilyintheboundarylayer)-easterlyflowtheearlierarrivalofthehumidlayerintheupperportionoftheboundarylayeranditsprogressivelaterarrivalatlowerlevelsiscausedbythepresenceofhigherhorizontalwindspeedvalues(7-8m/s)intheupperportionoftheboundarylayerwithrespecttothosefound(2-5m/s)inthelowerportion,-50WindDirection(degrees)-100-15010864WindSpeed(m/s)201009080706050RelativeHumidity(%)40302000:0008:0016:0000:0008:0016:0000:-,RCS532,asmeasuredbyBASILoveratimeperiodof18hfrom00:00UTto18:,whichiscausedbythearrivalofanaerosol-loadedairmassassociatedwiththesouth-easterlymarineflowshortlyafterthelow-,,predominantlyofmaritimeorigin,whichisreplacingthecolderanddrierairadvectedbytheMistral/Tramontaneflow,%-NH(paneld)andAROMEWMED(panele):00UTon19September2012to17:-NHandAROME--NHandAROME-WMEDproperlysimulatethetime-heightstructureofthehumidityfieldobservedbyBASIL,reproducingthearrivalofthehumidairintheboundarylayerwithsimilarmixingratiovalues(8-12g/kg)forAROME-WMEDandslightlylowervalues(intherange6-8g/kg)forMESO-,withAROME-WMEDbeinginbetteragreementwithBASIL()thantheonefromMESO-NH().However,bothmodelswellcapturetheelevatedhumidlayerpresentinthefreetropospherewhichisvisibleinBASILdata,,withabaseat4kmaround16:00UTandprogressivelydescendingdownto3kmaround06:,RSDIAL--levelwindreversalsassociatedwithtransitioneventsfromMistral/plementedRSDIAL-LEANDRE2,-3[g/kg]10158(a)(km)HEIGHT(km)(d):4923:0804:5810:4816:33HEIGHT(km)(km)HEIGHT[g/kg]TIME(UTC)100817:0020:0023:0002:0005:0008:0011:0014:0017:006(b)(km)HEIGHT(km)0(e):0004:0008:0012:0016:00TIME(UTC)HEIGHT(km)(km)HEIGHT[g/kg]017:0020:0023:0002:0005:0008:0011:0014:0017:00(c)TIME(UTC)HEIGHT(km))WatervapourmixingratioasmeasuredbyBASILoverathetimeperiodfrom16:49UTon19September2012to16:)RCS532asmeasuredbyBASILoverthetimeperiodfrom00:00UTto16:)Windspeedanddirectionson18-19-20S