backward trajectory analysis using noaa hysplit model

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1、BackwardTrajectoryAnalysisusingNOAAHYSPLITModelLeungSiuKi,FrancisSummerInternshipattheHongKongObservatory2006Supervisor:Y.KLeung,M.C.WuJuly200613TableofContents1Introduction12HYSPLITModel2.1Overview12.2TrajectoryComputationalMethod22.3ErrorSourcesinTrajectoryCalculation32.4Incorporat

2、ing20km-ORSMdataintoHYSPLITModel32.5ComparisonofORSMDataandGlobalModelData53BackwardTrajectoryAnalysis3.1SingleEpisode63.2SeasonalAnalysis84Conclusion105FutureWork106References11131313IntroductionAdeterioratingtrendisobservedinthevisibilityinHongKongforthelasttwodecadesandtheproblems

3、eemstobeworseningintherecentyears.AfterhavingarecordbreakinghighpercentageoftimewithreducedvisibilityobservedattheHongKongObservatoryin2004,thereducedvisibilityobservedattheHongKongInternationalAirportcontinuestoclimbandhitthehighestrecordsincethestartofitsoperation.Sincethedegrading

4、visibilityisaffectingthehealthoflocalpeopleaswellastheeconomy,itisnecessarytoidentifythesourcescontributingtovisibilityimpairment.Severaltoolshavebeendevelopedandareavailabletoaidthestudiesoflowvisibility,andacategoryofthemisknownastheatmospheretransportanddispersionmodels,whichareal

5、socalledtheairqualitymodels.Bysimulatingthemovementsofvisibilityimpairingpollutantssuchassulfurparticleintheatmosphere,thesourceofemissioncanbeidentified.Backtrajectoryanalysisisatechniquetoidentifythesourcebasedonthesimulationresultsobtainedfromthesemodels.1HYSPLITModel1.1OverviewHY

6、SPLIT(HybridSingle-ParticleLagrangianIntegratedTrajectory)modelisoneoftheatmospherictransportanddispersionmodelsmostfrequentlyusedinlarge-scaleresearch.ItwasdevelopedbytheAirResourcesLaboratory(ARL)oftheNationalOceanicandAtmosphericAdministration(NOAA)andithasbeenupgradedinApril2001a

7、sajointeffortbetweenNOAAandAustralia’sBureauofMeteorology.Themodelfeaturesatrajectorymodelcalculatingsimpletrajectoriesandaconcentrationmodelsimulatingcomplexdispersionanddispositionofpollutants.Thisstudyfocusesonthetrajectorymodelonly.HYSPLITcanberunontheInternetthroughtheReal-timeE

8、nvironmental