[ACG36-P15] Introduction about First Imagery of Ocean Color Products on GCOM-C/SGLI
Keywords:GCOM-C, SGLI, remote sensing, ocean color
Ocean color products is 250 m spatial resolution in coastal region or 1 km over offshore area. The products are made using ocean color channels which have high gain and Signal-Noise-Ratio (SNR) . The products consist of 6 products: Normalized Water Leaving Radiance (NWLR) [W/m2/str/um] , Atmospheric Correction Parameters (ACP: aerosol optical thickness 670 and 865), Photosynthetically Available Radiation (PAR) [Ein/m2/day] , Chlorophyll-a concentration (CHLA)[mg/m3] , Suspended Solid concentration (SS) [ g/m3], Absorption coefficient of Colored Dissolved Organic Matter (CDOM) [m-1]. The NWLR and the ACP algorithms is an extension of the OCTS and GLI atmospheric correction algorithms. The new features are absorptive aerosol correction using 380 nm band (VN1) and aerosol model selection over high turbid water using two SWIR channels.PAR is estimated by an algorithm used on SeaWiFS and MODIS. The CHLA is estimated by Ocean Color Index (OCI) algorithm to improve accuracy of chlorophyll-a concentration over the low concentration area. The CDOM algorithm consists of two steps. First, Inherent Optical Property (IOP) is calculated with iterative procedure. And then, CDOM is obtained from an absorption coefficient of detritus and CDOM contained in the former IOP. The SS product is estimated by empirical algorithm.
Observations of VNR and SWIR started on 1 January, 2018, the initial check out which confirms observation and calibration functions was conducted till three months from the launch. This report introduces the first imagery of ocean color products on GCOM-C/SGLI after the check out period.