Vertical Distributions of Aerosol Optical Properties during Haze and Floating Dust Weather in Shanghai-中国Betway体育网页登陆

摘要 AcomparativestudyontheverticaldistributionsofaerosolopticalpropertiesduringhazeandfloatingdustweatherinShanghaiwasconductedbasedonthedataobtainedfromamicropulselidar.Therewasadistinctdifferenceinlayerthicknessandextinctioncoefficientunderthetwotypesofweatherconditions.Aerosolswereconcentratedbelow1kmandtheaerosolextinctioncoefficientsrangedfrom0.25to1.50km-1onhazedays.Incontrast,aerosolswithsmallerextinctioncoefficients(0.200.35km-1)accumulatedmainlyfromthesurfaceto2kmonfloatingdustdays.Theseasonalvariationsofextinctionandaerosolopticaldepth（AOD）forbothhazeandfloatingdustcasesweresimilargreatestinwinter,smallerinspring,andsmallestinautumn.Morethan85%oftheaerosolsappearedintheatmospherebelow1kmduringseverehazeandfloatingdustweather.Thediurnalvariationoftheextinctioncoefficientofhazeexhibitedabimodalshapewithtwopeaksinthemorningoratnoon,andatnightfall,respectively.Theaerosolextinctioncoefficientgraduallyincreasedthroughoutthedayduringfloatingdustweather.Casestudiesshowedthathazeaerosolsweregeneratedfromthesurfaceandthenliftedup,butfloatingdustaerosolsweretransportedverticallyfromhigheraltitudetothesurface.TheAODduringfloatingdustweatherwashigherthanthatduringhaze.Theboundarylayerwasmorestableduringhazethanduringfloatingdustweather.

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Vertical Distributions of Aerosol Optical Properties during Haze and Floating Dust Weather in Shanghai

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