해수면 흐름 및 프론트 검출을 위한 천리안해양관측위성의 활용

Abstract

The Geostationary Ocean Color Imager (GOCI) can be utilized to observe subtle changes in oceanic environments because it receives ocean color data around the Northeast Asia every hour, eight times a day. This study focused on 1) estimating ocean surface currents and 2) extracting ocean fronts, using GOCI. To estimate currents, the maximum cross correlation (MCC) based algorithm was proposed. The total suspended sediment (TSS) was used to approximately estimate semi-diurnal tidal currents in highly turbid coastal waters, and the chlorophyll concentration (chl) was employed for relatively clear waters. In the results, it was validated that the currents estimated by the proposed algorithm trace dynamic movements on the west coast of Korea and represent well the movements along boundaries where warm and cold seawaters mix in the East/Japan Sea. To extract fronts, we developed a histogram-based methodology. In order to validate oceanic changes in the coastal region which has extremely high turbidities, the fronts derived from TSS were used. On the other hand, the fronts derived from chl were exploited to investigate oceanic changes in the offshore which has relatively low turbidities. 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 fronts are quite relevant to the topographical characterisocean surface currents and 2) extracting ocean fronts, using GOCI. To estimate currents, the maximum cross correlation (MCC) based algorithm was proposed. The total suspended sediment (TSS) was used to approximately estimate semi-diurnal tidal currents in highly turbid coastal waters, and the chlorophyll concentration (chl) was employed for relatively clear waters. In the results, it was validated that the currents estimated by the proposed algorithm trace dynamic movements on the west coast of Korea and represent well the movements along boundaries where warm and cold seawaters mix in the East/Japan Sea. To extract fronts, we developed a histogram-based methodology. In order to validate oceanic changes in the coastal region which has extremely high turbidities, the fronts derived from TSS were used. On the other hand, the fronts derived from chl were exploited to investigate oceanic changes in the offshore which has relatively low turbidities. 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 fronts are quite relevant to the topographical characteris