Aerosol optical depth retrieval from FY-3A/MERSI for sand-dust weather over ocean
The Aerosol Optical Depth (AOD) retrieval algorithm for sand-dust weather over ocean is investigated using FY-3A/Medium Resolution Spectral imager (MERSI) based on aerosol modes in the MODIS C005 over-ocean algorithm.The AOD (550 nm) retrieved from MERSI is evaluated with MODIS AOD product (MOD04).Results show a systematic bias in this algorithm.Further analyses reveal that this bias results from the MODIS-available aerosol modes.Therefore,a sand-dust aerosol mode is adopted to modify the MODIS aerosol modes by mixing them at an appropriate ratio.AOD is retrieved a second time based on the modified aerosol modes,and the corresponding results exhibit good consistency with MOD04,indicating that modified aerosol modes are more appropriate for the AOD retrieval from MERSI for sand-dust weather over ocean.
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