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An aerosol model optimized for northeast Asia is updated with the inversiondata from the Distributed Regional Aerosol Gridded Observation Networks(DRAGON)-northeast (NE) Asia campaign which was conducted during spring from March to May2012. This updated aerosol model was then applied to a single visible channelalgorithm to retrieve aerosol optical depth (AOD) from a MeteorologicalImager (MI) on-board the geostationary meteorological satellite,Communication, Ocean, and Meteorological Satellite (COMS). This model plays animportant role in retrieving accurate AOD from a single visible channel measurement. For the single-channel retrieval,sensitivity tests showed that perturbations by 4 % (0.926 ± 0.04)in the assumed single scattering albedo (SSA) can result in the retrievalerror in AOD by over 20 %. Since the measured reflectance at thetop of the atmosphere depends on both AOD and SSA, the overestimation of assumedSSA in the aerosol model leads to an underestimation of AOD. Based on the AErosolRObotic NETwork (AERONET) inversion data sets obtained over East Asia before2011, seasonally analyzed aerosol optical properties (AOPs) were categorized by SSAs at 675 nm of0.92 ± 0.035 for spring (March, April, and May). After the DRAGON-NEAsia campaign in 2012, the SSA during spring showed a slight increase to0.93 ± 0.035. In terms of the volume size distribution, the mode radiusof coarse particles was increased from 2.08 ± 0.40 to2.14 ± 0.40. While the original aerosol model consists of volume sizedistribution and refractive indices obtained before 2011, the new model isconstructed by using a total data set after the DRAGON-NE Asia campaign. Thelarge volume of data in high spatial resolution from this intensivecampaign can be used to improve the representative aerosol model for EastAsia. Accordingly, the new AOD data sets retrieved from a single-channelalgorithm, which uses a precalculated look-up table (LUT) with the newaerosol model, show an improved correlation with the measured AOD during theDRAGON-NE Asia campaign. The correlation between the new AOD and AERONETvalue shows a regression slope of 1.00, while the comparison of the originalAOD data retrieved using the original aerosol model shows a slope of 1.08. Thechange of <i>y</i>-offset is not significant, and the correlation coefficients forthe comparisons of the original and new AOD are 0.87 and 0.85, respectively.The tendency of the original aerosol model to overestimate the retrieved AODis significantly improved by using the SSA values in addition to sizedistribution and refractive index obtained using the new model

atmospheric chemistry and physics

Aerosol optical properties derived from the DRAGON-NE Asia campaign, and implications for a single-channel algorithm to retrieve aerosol optical depth in spring from Meteorological Imager (MI) on-board the Communication, Ocean, and Meteorological Satellite (COMS)