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1、A3.5-yearsignalinHighLatitudeColumnOzoneJingqianWang,1*XunJiang,1Run-LieShia,2andYukYung21DepartmentofEarthandAtmosphericSciences,UniversityofHouston,TX77204,USA.2DivisionofGeologicalandPlanetarySciences,CaliforniaInstituteofTechnology,1200EastCaliforniaBoulevard,Pasadena
2、,CA91125,USA.*Towhomallcorrespondenceshouldbeaddressed.E-mail:jingqian.wang@gmail.com14AbstractWeappliedspectralanalysistomonthlymeancolumnozonesondedata,whichhaverelativelylongrecord.Thereisasignificantsignalat3.5yearsforsomestations.Torevealthesourcefor3.5-yrsignal,weap
3、pliedsimilaranalysistocolumnozonesimulatedbytheGoddardEarthObservationSystemChemistry-ClimateModel(GEOS-CCM).GEOS-CCMisdrivenbyrealseasurfacetemperature,whichhascorrectElNiño-SouthernOscillation(ENSO)signalatthesurface.Wefoundthat3.5-yrsignalalsoexistsinthemodelozone.Sinc
4、ethemodelwithrealisticENSOcanreproducethe3.5-yrsignal,itislikelythatthe3.5-yrsignalisfromtheENSOsignal.WefurtherappliedEmpiricalModeDecompostion(EMD)methodtoanalyzetheozonesondesandmodelsimulations.3.5-yrsignalisverysignificantintheEMDoutputsfrombothobservationsandmodelsi
5、mulations.141.Introduction2.DatasetsandMethods:2.1DatasetsInthispaper,wewillinvestigatecolumnozonesondedata,whichhaverelativelylongdatarecord.(Datacanbedownloadedfromhttp://www.woudc.org/data_e.html).Twenty-onestationswithlongrecordarefound.Theseozonesondedatawillbecompar
6、edwithmodelsimulationfromGEOS-CCM(Stolarskietal.,2006b;Pawsonetal.,2007).GEOS–Chemistryisaglobal3-Dchemicaltransportmodel(CTM)foratmosphericcomposition.ItusesmeteorologicalinputfromtheGoddardEarthObservingSystem(GEOS)oftheNASAGlobalModelingandAssimilationOffice.Couplingbe
7、tweenthecirculationandchemistryarisesthroughtransportandtheinteractivenatureoftheradiationcode,whichallowsforthefeedbackofO3,H2O,CO2,CH4,N2O,CFC-11,andCFC-12withthecirculation.Archivesofmonthlymeanozoneandmeteorologicalfieldswereusedfromasimulationoftheperiod1951-2005at2º
8、´2.5º(latitudebylongitude)with55layersbetweenthesurfaceandabout80km.Atthelowerboundary,seasurfac
