南海乐东海域黄色物质浓度反演及其时空变化分析

Inversion of yellow substance concentration and its spatialtemporal variation analysis in Ledong waters,South China Sea

为掌握南海乐东海域黄色物质浓度的时间及空间动态,对该海域黄色物质浓度反演方法及表达方式进行研究。利用在乐东海域遥感地质调查获取的黄色物质吸收系数数据对Carder和Tassan两种模型进行回归分析,得到黄色物质浓度反演模型。其中,利用Carder模型进行回归分析得到的回归模型决定系数R^2为0.62;利用Tassan模型进行回归分析得到的回归模型决定系数R^2为0.78。应用精度较高的Tassan回归模型反演黄色物质浓度并进行年度、季度变化分析,结果表明:1由近岸到深海,黄色物质浓度呈现逐渐下降的趋势,且分布一定程度上受洋流和人类活动的影响;2黄色物质浓度有逐年上升的趋势,在不同季节里,冬季黄色物质浓度最高。

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.