A study on the Estimate of Daily PAR at the ocean around Korean Peninsula using GOCI

Photosynthetically available radiation (PAR) has a key role in generating primary production at the ocean surface. Various satellite sensors were used to estimate PAR at the ocean, but GOCI, the world’s first geostationary ocean color sensor, didn’t service PAR as an official product yet. In this study, PAR for the ocean around Korean Peninsula was estimated by using GOCI and validation was carried out. GOCI daily PAR was estimated from plane-parallel theory based model and corrected with in-situ measurements PAR data which had been collected at two ocean research stations. Corrected GOCI daily PAR has a high R² value (0.99) with in-situ measurements. GOCI daily PAR also shows a high accuracy in terms of root-mean-square error (RMSE) and mean bias error (MBE); 4.98 % and -0.52 %, respectively. As a result of the comparison with other sensors derived PAR data, GOCI daily PAR shows the highest performance at the ocean around Korean Peninsula. MODIS and AHI derived daily PAR have lower accuracy than GOCI. MODIS daily PAR has RMSE of 10.40 % and -4.15 % with in-situ measurements, and AHI daily PAR has 6.51 % and -4.65 %, respectively. GOCI daily PAR help to understand the marine environment around the Korean Peninsula. For the further study, PAR from GOCI-II will be discussed.