The second Geostationary ocean color imager (GOCI-II), succeeding the mission of GOCI, was launched in February 2020 and is currently in regular operation. It focuses on the succession and the expansion of the GOCI mission, and improves specifications over GOCI in terms of spatial, temporal and the spectral resolution. GOCI have effectively monitored water quality around Korean peninsula for the past decade in terms of chlorophyll-a concentrations (CHL), total suspended sediment (TSS), colored dissolved organic matter (CDOM) along with sea surface salinity (SSS). GOCI could get images in hourly base, making it possible to examine the diurnal variability of water quality. Now we have GOCI-II which has advanced spatial resolution (250 m), frequency (10 times a day) and spectral resolution (12 VNIR bands) for the previous one. Thus, we can get enhanced images in terms of time and space for the coastal waters around Korean peninsula and, consequently see more accurate dynamic variability in water quality. Here, we examined the applicability of GOCI-II to monitoring the diurnal variability in the water quality in Korean coastal waters in terms of the fundamental products like remote sensing reflectance (Rrs), chlorophyll-a concentrations (CHL) products by OCx algorithm, and total suspended sediment (TSS), colored dissolved organic matter (CDOM). We verified the algorithm by comparing with in-situ measurement and also with those from GOCI. Although GOCI has completed its mission at the end of March 2021, we have the duplicated times of operating GOCI-I, GOCI-II from February 2020 to March 2021. From this study, we examined and effectively identified the diurnal variability of water quality of Korean coastal waters.

Primary Presenter: Jongkuk choi, KIOST (jkchoi@kiost.ac.kr)

Authors:

Myung-Sook Park,   ()

Young-Baek Son,   ()

Jae-Hyun Ahn,   ()

Eunna Jang,   ()

Deuk Jae Hwang,   ()

Sun-Ju Lee,   ()

Kyeong-Sang Lee,   ()

Tae Hyun Han,   ()

Jeong-Eon Moon,   ()

Sujung Bae,   ()