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1、JOURNALOFGEOPHYSICALRESEARCH,VOL.113,D14214,doi:10.1029/2007JD009763,2008Anobservationalstudyoftherelationshipbetweencloud,aerosolandmeteorologyinbrokenlow-levelcloudconditions11NormanG.LoebandGregoryL.SchusterReceived26December2007;revised4March2008;accepted20March2008;published26July2008.[1]Glo
2、balsatelliteanalysesshowingstrongcorrelationsbetweenaerosolopticaldepthandcloudcoverhavestirredmuchdebaterecently.Whileitistemptingtointerprettheresultsasevidenceofaerosolenhancementofcloudcover,otherfactorssuchastheinfluenceofmeteorologyonboththeaerosolandclouddistributionscanalsoplayarole,asbot
3、haerosolsandcloudsdependuponlocalmeteorology.Thisstudyusessatelliteobservationstoexamineaerosol-cloudrelationshipsforbrokenlow-levelcloudregionsoffthecoastofAfrica.Theanalysisapproachminimizestheinfluenceoflarge-scalemeteorologybyrestrictingthespatialandtemporaldomainsinwhichtheaerosolandcloudpro
4、pertiesarecompared.Whiledistributionsofseveralmeteorologicalvariableswithin5°5°latitude-longituderegionsarenearlyidenticalunderlowandhighaerosolopticaldepth,thecorrespondingdistributionsofsingle-layerlowcloudpropertiesandtop-of-atmosphereradiativefluxesdiffermarkedly,consistentwithearlierstudies
5、showingincreasedcloudcoverwithaerosolopticaldepth.Furthermore,fine-modefractionandAngstromExponentarealsolargerinconditionsofhigheraerosolopticaldepth,eventhoughnoevidenceofsystematiclatitudinalorlongitudinalgradientsbetweenthelowandhighaerosolopticaldepthpopulationsareobserved.Whentheanalysisisr
6、epeatedforall5°5°latitude-longituderegionsovertheglobaloceans(afterremovingcasesinwhichsignificantmeteorologicaldifferencesarefoundbetweenthelowandhighaerosolpopulations),resultsarequalitativelysimilartothoseoffthecoastofAfrica.Citation:Loeb,N.G.,andG.L.Schuster(2008),Anobservationalstudyofthere
7、lationshipbetweencloud,aerosolandmeteorologyinbrokenlow-levelcloudconditions,J.Geophys.Res.,113,D14214,doi:10.1029/2007JD009763.1.Introductionaerosol-cloudcorrelationsareeither‘‘real’’(increasedhy-groscopicaerosolparti
