Remote Sensing Retrieval and Hourly Variation Analysis of Total Absorption Coefficient in the Bohai Sea with Geostationary Ocean Color Imager

Abstract

The optical properties of the semi-closed Bohai Sea are complex due to significant terrigenous influence. The high temporal resolution data from geostationary ocean color imager (GOCI) makes it possible to explore the temporal and spatial variability characteristics in the Bohai Sea, especially on the hourly temporal scale. A remote sensing algorithm is developed to retrieve the total absorption coefficients at 412, 443, 555 nm in the Bohai Sea based on the GOCI band ratio of remote sensing reflectance. The algorithm is validated with independent field data. The correlation coefficient between the retrieved and measured data is higher than 0.8, the average absolute percentage difference (APD) is less than 13%, and the median absolute percentage difference is less than 9%. The performance is better than that of previous typical algorithms (improvement over 10%). Based on the independent field-satellite match-up data, the APD between the retrieved and measured data is less than 35%. On the basis of the GOCI image