Evaluation of GOCI atmospheric correction regarding the diurnal observation of ocean color variation

Abstract

The Geostationary Ocean Color Imager (GOCI) observes the Northeast Asia ocean environment and it can provide diurnal ocean color image from the geostationary orbit. The process of atmospheric correction for ocean color data acquired from satellite plays an important role in determining the quality of the derived ocean environmental products. For the diurnal observation, moreover, the stability of the atmospheric correction for various solar angles is additionally required. Small uncertainties of atmospheric parameters can significantly cause the diurnal instability of atmospheric correction performance. Various atmospheric radiances regarding directional effect is simulated by radiative transfer code to see the sensitivity. In the study, we first analyze that how the GOCI atmospheric correction is sensitive to the uncertainties along various solar angles through simulations. Then the uncertainty of remote-sensing reflectance (Rrs) resulted by the atmospheric correction is compared with the in situ diurnal variabilities of Rrs to what extent GOCI detect the diurnal changes in the marine environment.tellite plays an important role in determining the quality of the derived ocean environmental products. For the diurnal observation, moreover, the stability of the atmospheric correction for various solar angles is additionally required. Small uncertainties of atmospheric parameters can significantly cause the diurnal instability of atmospheric correction performance. Various atmospheric radiances regarding directional effect is simulated by radiative transfer code to see the sensitivity. In the study, we first analyze that how the GOCI atmospheric correction is sensitive to the uncertainties along various solar angles through simulations. Then the uncertainty of remote-sensing reflectance (Rrs) resulted by the atmospheric correction is compared with the in situ diurnal variabilities of Rrs to what extent GOCI detect the diurnal changes in the marine environment.