Vicarious calibration of COCTS-HY1C at visible and near-infrared bands for ocean color application
2019
Remote sensing reflectance obtained from space-borne ocean color sensors is of great importance to carbon cycle and ocean-atmospheric interactions by providing biogeochemical parameters on the global scale using specific algorithms.
Vicariouscalibration is necessary for obtaining accurate remote sensing reflectance that meets the application demands of
atmospheric correctionalgorithms. For ocean color sensors,
vicariouscalibration must be done prior to
atmospheric correction. The third Chinese Ocean Color and Temperature Scanner (COCTS) aboard the HY1C satellite was launched on September 7, 2018, and it will provide essential ocean color data that will complement those of existing missions. We used field measurements from the Marine Optical Buoy (MOBY) and aerosol information provided by the MODerate Imaging
Spectroradiometer(MODIS) aboard the Terra satellite to calculate
vicariouscalibration coefficients, and we further evaluated the applicability of the established
vicariouscalibration approach by cross-calibration using MODIS data on the global scale. Finally, the established
vicariouscalibration coefficients were used to retrieve the aerosol optical depth and remote sensing reflectance, which were compared to Aerosol Robotic Network-Ocean Color (
AERONET-OC) data and MODIS-Terra and Ocean and Land Color Instrument (OLCI)-Sentinel-3A operational products. The results show that the
vicariouscalibration coefficients are relatively stable and reliable for all bands ranging from visible to near-infrared and can be used to obtain accurate high-quality data.
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Correction
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