College of Geo-exploration Science and Technology, Jilin University, Changchun 130026, China

In order to grasp the spatial-temporal dynamic state of yellow substance concentration in Ledong waters, South China Sea, the inversion method and expression pattern are studied. The yellow substance absorption coefficient data of remote sensing geological survey in Ledong waters are used to do stepwise regression analysis for Carder and Tassan models, and the yellow substance concentration inversion models are obtained. The determination coefficient R² of Carder regression model is 0.62, whereas the R² of Tassan regression model is 0.78. The high precision Tassan regression model is used to retrieve yellow substance concentration on multiple phases and its variations over the years and seasons are analyzed. The results show that yellow substance concentration is a gradually declining from the shore to deep sea, and its distribution is influenced by ocean currents and human activities to a certain extent. The yellow substance concentration has a yearly rising trend, and its highest concentration in winter.