Houston Case Study Specifications using WRF and RAMS Susan C. van den Heever (CSU) and Ann Fridlind (NASA GISS) ACPC DCC Initiative Co-Chairs Model Setup and Experiment Design tested extensively by Peter Marinescu (CSU) and Bethan White (Oxford)
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HoustonCaseStudySpecificationsusingWRFandRAMS
SusanC.vandenHeever(CSU)andAnnFridlind (NASAGISS)
ACPCDCCInitiativeCo-Chairs
ModelSetupandExperimentDesigntestedextensivelybyPeterMarinescu(CSU)andBethan White(Oxford)
ACPCWebsite
• www.acpcinitiative.org• Documentstobeposted– PeterMarinescu• ACPCmeetinginOxford(April2016)=>DCCroadmapdeveloped
• AppendixofDCCroadmaphasrecommendedCRMsetups
ACPCDCCInitiative
Goals1. toincreaseourunderstandingoftheimpacts
ofaerosolsondeepconvectivestorms,and2. toenhancetherepresentationofthese
impactsincloud-resolvingmodels(CRMs)throughglobalclimatemodels(GCMs)
throughtheutilizationofauniquecombinationofobservationsandnumericalexperiments.
KeyScienceQuestions• SQ1: Whatisthevariabilityoftheatmosphericresponse,bothlocallyandregionally,toaerosolperturbationsamongdifferentstate-of-the-artCRMs?
• SQ2:Whatphysicalprocessesarethemostsignificantcontributorstoaerosol-induceduncertaintiesincurrentCRMs,intermsofrepresentingaerosol-cloud-precipitation-climateinteractions?
• SQ3: Whatarethespatialandtemporalobservationsrequiredtocalculateaccurateestimatesofenergy,moisture,andaerosolfluxesonthescalesofaGCMgridbox?
Approach
• PartI:Multi-ModelCaseStudySimulations• PartII:ObservationalAnalysis• PartIII:BoxClosureStudy
Approach
PartI:Multi-ModelCaseStudySimulations• CasestudyfocusesonisolateddeepconvectionnearHouston,Texason19-20June,2013
• Favorabledueto:– Isolatednatureofdeepconvection– Localizedsourcesofaerosolparticlesevident
• EnsembleofdifferentCRMcasestudysimulationswithcleanandpollutedconditionswillbeevaluatedusingobservations
Approach
PartI:Multi-ModelCaseStudySimulations• Thesimulationswillbeusedtoquantifythespreadintheresponsetoaerosolperturbationsamongtherangeofstate-of-the-artCRMs=>SQ1
• In-depthanalysisofindividualconvectivecellsandmicrophysicalprocesses(togetherwithobservationalanalysis)willprovidethephysicalreasonsfortheseresults=>SQ2
• ExtensivemodeltestingwithWRFandRAMStoassessappropriatesimulationsetups
ModelConfiguration
PhysicsParameterizations
• 2Experiments=>1cleanand1polluted
• Clean:AP(z)=300cm-3 *exp(z/7000m)
• Polluted:AP(z)=1800cm-3 *exp(z/7000m)
Theseaerosolvaluesarebasedonconvectivecloudbaseclouddropletnumberconcentrationsestimatedviaasatellitealgorithmfromdataon19June2013case.DetailsofthisalgorithmcanbefoundinRosenfield etal.(2014).
AerosolExperiments
ImageprovidedbyDanielRosenfeld
ModelOutputs
• Specificmodeloutputsarerequested• ThesimulationdatawillbearchivedwithinanACPCworkspaceonJASMIN,adatacenterfundedbytheNaturalEnvironmentResearchCouncil(NERC)andtheUKSpaceAgency(UKSA).
• Variousfrequenciesandformatsrequired
ComparisonstoObservations• 3KMAGLRadarReflectivity:1800UTC
KHGX RAMS
KHGXradardataprovidedbyMarcusvanLier-WalquiandAnnFridlind
June19,2013
Scatteredconvectivecellsdevelopinnorth-westernTexas
ComparisonstoObservations• 3KMAGLRadarReflectivity:1900UTC
KHGX RAMS
KHGXradardataprovidedbyMarcusvanLier-WalquiandAnnFridlind
June19,2013
Scatteredconvectivecellsdevelopinnorth-westernTexas
ComparisonstoObservations• 3KMAGLRadarReflectivity:2000UTC
KHGX RAMS
KHGXradardataprovidedbyMarcusvanLier-WalquiandAnnFridlind
June19,2013
ScatteredcellulardevelopmentshiftssouthwardnearHoustonarea
ComparisonstoObservations• 3KMAGLRadarReflectivity:2100UTC
KHGX RAMS
KHGXradardataprovidedbyMarcusvanLier-WalquiandAnnFridlind
June19,2013
ScatteredcellulardevelopmentshiftssouthwardnearHoustonarea
ComparisonstoObservations• 3KMAGLRadarReflectivity:2200UTC
KHGX RAMS
KHGXradardataprovidedbyMarcusvanLier-WalquiandAnnFridlind
June19,2013
ScatteredcellulardevelopmentshiftssouthwardnearHoustonarea
ComparisonstoObservations• 3KMAGLRadarReflectivity:2300UTC
KHGX RAMS
KHGXradardataprovidedbyMarcusvanLier-WalquiandAnnFridlind
June19,2013
ScatteredcellulardevelopmentshiftssouthwardnearHoustonarea
ComparisonstoObservations• 3KMAGLRadarReflectivity:2400UTC
KHGX RAMS
KHGXradardataprovidedbyMarcusvanLier-WalquiandAnnFridlind
June19,2013
Convectivecellsbecomelesswidespread
ComparisonstoObservations• RadarReflectivityCFADs(06/191800UTC– 2400UTC)
– ConvectiveGridColumnsà 3KMAGLReflectivity>40dBZ
KHGXradardataprovidedbyMarcusvanLier-WalquiandAnnFridlind
June19,2013
Approach
PartII:ObservationalAnalysis• Modelevaluation- bringsimulationsascloseaspossibletothenarrowlistofwell-observedquantitiesinordertofacilitateevaluation
• Observationswillbeusedbothinconjunctionwiththecasestudysimulations,andseparatelyasanothertooltostudyaerosol-cloudinteractions=>SQ2
• Detailsalreadycovered
Approach
PartIII:BoxClosureStudy• CRMensembleprovidehighspatialandtemporalresolutiondatatoaddressfeasibilityofconductingaboxclosurestudyforaGCMgridbox,asoutlinedinRosenfeldetal.(2014).
• Simulationdatawillbeusedtocalculatepreciseenergy,moisture,momentumandaerosolfluxesacrossaregionrepresentingaGCMgridbox(~100x100kminhorizontalextentandtothetopofthetropopauseinverticalextent).
Approach
PartIII:BoxClosureStudy• Hypotheticalfieldcampaignsamplingtechniqueswillbeappliedtomodeldatatodeterminetemporalfrequencyandspatialresolutionofobservationsnecessarytocalculatesyntheticfluxmeasurements=>SQ3
• Thelarge-scaleGCMboxfluxmeasurementswillbecalculatedforallCRMsimulationsinordertoquantifyvariabilityinenergy,moisture,momentumandaerosolfluxestoaerosolperturbationsacrossthedifferentCRMs=>SQ1
NextSteps• Encouragemodelinggroupstoparticipateinthestudy
• Only2simulationsareneededandthebasicsetupsaredescribedintheroadmap=>limitedmodeltinkering
• InitialresultsatACPCmeeting(April2017)• Finalizesimulationperformanceandanalysisbyendof2017
• SeveralDCCmanuscriptsplannedincludingadescriptionoffieldcampaignneeds
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