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. Recently launched multichannel geostationary Earth orbit (GEO) satellitesensors, such as the Geostationary Ocean Color Imager (GOCI) and the AdvancedHimawari Imager (AHI), provide aerosol products over East Asia with highaccuracy, which enables the monitoring of rapid diurnal variations and thetransboundary transport of aerosols. Most aerosol studies to date have usedlow Earth orbit (LEO) satellite sensors, such as the Moderate ResolutionImaging Spectroradiometer (MODIS) and the Multi-angle ImagingSpectroradiometer (MISR), with a maximum of one or two overpass daylighttimes per day from midlatitudes to low latitudes. Thus, the demand for new GEOobservations with high temporal resolution and improved accuracy has beensignificant. In this study the latest versions of aerosol optical depth(AOD) products from three LEO sensors – MODIS (Dark Target, Deep Blue, andMAIAC), MISR, and the Visible/Infrared Imager Radiometer Suite(VIIRS), along with two GEO sensors (GOCI and AHI), are validated,compared, and integrated for a period during the Korea–United States AirQuality Study (KORUS-AQ) field campaign from 1 May to 12 June 2016 over EastAsia. The AOD products analyzed here generally have high accuracy with highR (0.84–0.93) and low RMSE (0.12–0.17), but their error characteristics differaccording to the use of several different surface-reflectance estimationmethods. High-accuracy near-real-time GOCI and AHI measurements facilitatethe detection of rapid AOD changes, such as smoke aerosol transport fromRussia to Japan on 18–21 May 2016, heavy pollution transport from China tothe Korean Peninsula on 25 May 2016, and local emission transport from the SeoulMetropolitan Area to the Yellow Sea in South Korea on 5 June 2016. Thesehigh-temporal-resolution GEO measurements result in more representativedaily AOD values and make a greater contribution to a combined daily AODproduct assembled by median value selection with a 0.5∘×0.5∘ grid resolution. The combined AOD is spatially continuous and hasa greater number of pixels with high accuracy (fraction within expectederror range of 0.61) than individual products. This study characterizesaerosol measurements from LEO and GEO satellites currently in operation overEast Asia, and the results presented here can be used to evaluate satellitemeasurement bias and air quality models.

Validation, comparison, and integration of GOCI, AHI, MODIS, MISR, and VIIRS aerosol optical depth over East Asia during the 2016 KORUS-AQ campaign