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A radiative transfer interface has been developed to simulate the UV aerosolindex (AI) from the NASA Goddard Earth Observing System version 5 (GEOS-5)aerosol assimilated fields. The purpose of this work is to use the AI andaerosol absorption optical depth (AAOD) derived from the Ozone MonitoringInstrument (OMI) measurements as independent validation for the Modern EraRetrospective analysis for Research and Applications Aerosol Reanalysis(MERRAero). MERRAero is based on a version of the GEOS-5 model that isradiatively coupled to the Goddard Chemistry, Aerosol, Radiation, andTransport (GOCART) aerosol module and includes assimilation of aerosoloptical depth (AOD) from the Moderate Resolution Imaging Spectroradiometer(MODIS) sensor. Since AI is dependent on aerosol concentration, opticalproperties and altitude of the aerosol layer, we make use of complementaryobservations to fully diagnose the model, including AOD from the Multi-angleImaging SpectroRadiometer (MISR), aerosol retrievals from the AErosol ROboticNETwork (AERONET) and attenuated backscatter coefficients from theCloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation (CALIPSO)mission to ascertain potential misplacement of plume height by the model. Bysampling dust, biomass burning and pollution events in 2007 we have comparedmodel-produced AI and AAOD with the corresponding OMI products, identifyingregions where the model representation of absorbing aerosols was deficient.As a result of this study over the Saharan dust region, we have obtained anew set of dust aerosol optical properties that retains consistency with theMODIS AOD data that were assimilated, while resulting in better agreementwith aerosol absorption measurements from OMI. The analysis conducted overthe southern African and South American biomass burning regions indicates thatrevising the spectrally dependent aerosol absorption properties in thenear-UV region improves the modeled-observed AI comparisons. Finally, duringa period where the Asian region was mainly dominated by anthropogenicaerosols, we have performed a qualitative analysis in which the specificationof anthropogenic emissions in GEOS-5 is adjusted to provide insight intodiscrepancies observed in AI comparisons

Using the OMI aerosol index and absorption aerosol optical depth to evaluate the NASA MERRA Aerosol Reanalysis