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A comprehensive dynamic threshold algorithm for daytime sea fog retrieval is especially developed to distinguish sea fogs from marine boundary stratusbased on Moderate Resolution Imaging Spectroradiometer (MODIS) data and sea surface temperature (SST).Sea fogs and marine boundary stratus (fog/stratus) are detected utilizing MODIS bands (0.62-12.27um) by already-existed methods at first.To overcome the resemblance in fog/stratus radiative spectrum, the discrepancies in temperature and humidity vertical structures between sea fogs and stratus are analyzed from soundings.