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1、JOURNALOFGEOPHYSICALRESEARCH,VOL.117,D18210,doi:10.1029/2012JD017756,2012Infraredextinctionspectraofmineraldustaerosol:Singlecomponentsandcomplexmixtures1121OlgaLaskina,MarkA.Young,PaulD.Kleiber,andVickiH.GrassianReceived8March2012;revised13July2012;accep
2、ted15July2012;published25September2012.[1]SimultaneousFouriertransforminfrared(FTIR)extinctionspectraandaerosolsizedistributionshavebeenmeasuredforsomecomponentsofmineraldustaerosolincludingfeldspars(albite,oligoclase)anddiatomaceousearth,aswellasmorecomp
3、lexauthenticdustsamplesthatincludeIowaloessandSaharansand.Spectralsimulationsforsingle-componentsamples,derivedfromRayleigh-theorymodelsforcharacteristicparticleshapes,betterreproducetheexperimentalspectraincludingthepeakpositionandbandshapecomparedtoMiet
4、heory.ThemineralogyoftheauthenticdustsampleswasinferredusinganalysisofFTIRspectra.Thisapproachallowsforanalysisofthemineralogyofcomplexmulticomponentdustsamples.Extinctionspectrafortheauthenticdustsamplesweresimulatedfromthederivedsamplemineralogyusingpub
5、lishedopticalconstantdatafortheindividualmineralconstituentsandassuminganexternalmixture.Nonsphericalparticleshapeeffectswerealsoincludedinthesimulationsandwereshowntohaveasignificanteffectontheresults.Theresultsshowthatthepositionofthepeakandtheshapeofth
6、ebandoftheIRcharacteristicfeaturesinthe1800to1400cmspectralrangearenotwellsimulatedbyMietheory.Theresonance1peaksareconsistentlyshiftedbymorethan+40cmrelativetotheexperimentalspectrumintheMiesimulation.Rayleighmodelsolutionsfordifferentparticleshapesbet
7、terpredictthepeakpositionandbandshapeofexperimentalspectra,eventhoughtheRayleighconditionmaynotbestrictlyobeyedintheseexperiments.Citation:Laskina,O.,M.A.Young,P.D.Kleiber,andV.H.Grassian(2012),Infraredextinctionspectraofmineraldustaerosol:Singlecomponent
8、sandcomplexmixtures,J.Geophys.Res.,117,D18210,doi:10.1029/2012JD017756.1.Introductionatmosphericpropertiese.g.,temperatureprofilesoftheatmo-spherearedeterminedbasedonmeasurementsintheIR[2]Understandingtheroleofminer
