Validation, Comparison, and Integration of GOCI, AHI, MODIS, MISR, and VIIRS Aerosol Optical Depth over East Asia During the 2016 Korus-AQ Campaign
Journal Article - Open Access
NAVAL RESEARCH LAB WASHINGTON DC WASHINGTON United States
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Recently launched multichannel geostationary Earth orbit GEO satellite sensors, such as the Geostationary Ocean Color Imager GOCI and the Advanced Himawari Imager AHI, provide aerosol products over East Asia with high accuracy, which enables the monitoring of rapid diurnal variations and the transboundary transport of aerosols. Most aerosol studies to date have used low Earth orbit LEO satellite sensors, such as the Moderate Resolution Imaging Spectroradiometer MODIS and the Multiangle Imaging Spectroradiometer MISR, with a maximum of one or two overpass daylight times per day from midlatitudes to low latitudes. Thus, the demand for new GEO observations with high temporal resolution and improved accuracy has been significant. In this study the latest versions of aerosol optical depth AOD products from three LEO sensors - MODIS Dark Target, Deep Blue, and MAIAC, MISR, and the VisibleInfrared 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 Air Quality Study KORUS-AQ field campaign from 1 May to 12 June 2016 over East Asia. The AOD products analyzed here generally have high accuracy with high R 0.84-0.93 and low RMSE 0.12-0.17, but their error characteristics differ according to the use of several different surface-reflectance estimation methods. High-accuracy near-real-time GOCI and AHI measurements facilitate the detection of rapid AOD changes, such as smoke aerosol transport from Russia to Japan on 18-21 May 2016, heavy pollution transport from China to the Korean Peninsula on 25 May 2016, and local emission transport from the Seoul Metropolitan Area to the Yellow Sea in South Korea on 5 June 2016.