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多轴差分吸收光谱技术测量对流层SO_2垂直廓线及柱浓度.docx

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多轴差分吸收光谱技术测量对流层SO_2垂直廓线及柱浓度 Title:MeasurementofVerticalProfilesandColumnConcentrationofSO2intheTroposphereUsingMulti-AxisDifferentialOpticalAbsorptionSpectroscopy(MAX-DOAS)Technique Abstract: Sulfurdioxide(SO2)isasignificantairpollutantemittedbyanthropogenicactivitiesandnaturalsources.MonitoringandassessingtheverticalprofilesandcolumnconcentrationofSO2inthetroposphereareessentialforunderstandingitsdistributionandimpactonairquality.Inthisstudy,weemployedtheMulti-AxisDifferentialOpticalAbsorptionSpectroscopy(MAX-DOAS)techniquetomeasureSO2verticalprofilesandcolumnconcentrationsinthetroposphere. 1.Introduction AirpollutioncausedbySO2emissionsposessignificantriskstohumanhealthandtheenvironment.MonitoringtheverticaldistributionofSO2iscrucialforunderstandingitstransport,dispersion,andpotentialimpacts.Traditionalground-basedmeasurementsprovidelimitedinformationontheverticaldistributionduetotheirstationarynature.TheMAX-DOAStechniquerepresentsaninnovativesolutiontomeasureSO2verticalprofilesandcolumnconcentrations. 2.Multi-AxisDifferentialOpticalAbsorptionSpectroscopy(MAX-DOAS)Technique TheMAX-DOAStechniquemeasurestheabsorptionoflightbytracegasesintheatmosphereusingground-basedspectrometers.Itutilizesthedifferentialabsorptionapproachalongdifferentviewinganglestoretrievetheverticalprofilesoftracegases.Thetechniqueinvolvesscanningtheatmospherewithmultipleelevationanglesandfittingthemeasuredspectratoretrievethedifferentialslantcolumndensities. 3.ExperimentalSetup Inthisstudy,aMAX-DOASinstrumentwasinstalledataselectedsite.Thesystemconsistedofaspectrometer,telescope,lightsource,anddataacquisitionsystem.ThespectrometerrecordedthescatteredsunlightintheUV-visiblespectralrange,whilethetelescopecollectedlightfrommultipleviewingangles.Thelightsourceprovidedadditionalreferencemeasurements.Thedataacquisitionsystemsynchronizedthemeasurementsandrecordedthespectraforfurtheranalysis. 4.MeasurementMethodology TheMAX-DOASinstrumentperformedmeasurementsduringdifferenttimeperiodstocapturethediurna