한반도 근해에서 해양 프론트 및 해수면 흐름을 측정하기 위한 GOCI 활용

Abstract

The Geostationary Ocean Color Imager (GOCI), the world’s first geostationary ocean color observation satellite, can be utilized efficiently and accurately to observe subtle changes in oceanic environments because it receives ocean color data around the Korean Peninsula every hour, eight times a day. This study focused on 1) extracting the ocean front and 2) estimating the ocean surface current, using GOCI data. To successfully extract the ocean front, the morphological gradient scheme which is one of traditional edge detection algorithms was employed. In order to validate oceanic changes in the coastal region which has extremely high turbidities (e.g. west coasts of Korea), the ocean front derived from total suspended sediment (TSS) images was used. On the other hand, the ocean front derived from chlorophyll concentration (CHL) images was exploited to investigate oceanic changes in the offshore which has relatively low turbidities (e.g. East Sea of Korea). In the results deduced from the TSS front, statistics of semi-diurnal changes for the tide in the coastal region were approximately measured, and we could find out that the extracted front is quite relevant to the topographical and physical characteristics of coastal region where tidal sand ridges are well evolved. In the results deduced from the CHL front for East Sea of Korea, dynamic variations (e.g. mushroom-shaped structures) and oceanic eddies (e.g. Ulleung ta around the Korean Peninsula every hour, eight times a day. This study focused on 1) extracting the ocean front and 2) estimating the ocean surface current, using GOCI data. To successfully extract the ocean front, the morphological gradient scheme which is one of traditional edge detection algorithms was employed. In order to validate oceanic changes in the coastal region which has extremely high turbidities (e.g. west coasts of Korea), the ocean front derived from total suspended sediment (TSS) images was used. On the other hand, the ocean front derived from chlorophyll concentration (CHL) images was exploited to investigate oceanic changes in the offshore which has relatively low turbidities (e.g. East Sea of Korea). In the results deduced from the TSS front, statistics of semi-diurnal changes for the tide in the coastal region were approximately measured, and we could find out that the extracted front is quite relevant to the topographical and physical characteristics of coastal region where tidal sand ridges are well evolved. In the results deduced from the CHL front for East Sea of Korea, dynamic variations (e.g. mushroom-shaped structures) and oceanic eddies (e.g. Ulleung