中文摘要：

利用2012年和2013年冬季长江口邻近海域的实测数据,分析了该区域漫衰减系数光谱特征,490nm波段向下漫衰减系数（Kd（490））的空间分布及影响因子,建立了该研究区域新的冬季漫衰减系数反演模型,并建立了研究区域内Kd（490）与有效光合辐射衰减系数（Kd（PAR））的关系。结果表明：长江口邻近区域Kd490值随着离岸距离的减小逐渐增大,最大值达到了1.8m^-1,杭州湾邻近区域情况类似,舟山岛附近出现了Kd（490）的最大值2.8m^-1。总悬浮物对Kd（490）的影响较大,悬浮物浓度与Kd（490）相关度大于0.86。黄色物质和叶绿素a对其影响较小,与Kd（490）相关度均小于0.25。本文建立了三波段遥感反射率与Kd（490）的反演模式：lg[Kd（490）]=a[Rrs（590）/Rrs（510）]＋b[Rrs（670）/Rrs（510）],对比反演与实测结果显示：均方根误差为0.098m^-1,平均相对误差为12.43%,决定系数为0.916;光合有效辐射衰减系数（Kd（PAR））与Kd（490）的关系：Kd（PAR）=0.495exp（0.8602Kd（490））-0.2217,对比反演与实测结果显示：均方根误差为0.102m^-1,平均相对误差为14.62%,决定系数为0.927。

英文摘要：

According to the situ data in Yangtze River Estuary＇s Adjacent sea area in March 2012 and March 2013, the spectral characteristics of the diffuse attenuation coefficient（Kd）, spatial distribution and dominant factors of Kd（490）, as well as the relationship between Kd （490） and photosynthetically active radiation attenuation coefficient （Ke （PAR）） were analyzed, and a new model to calculate Kd （490） was established. The results indicate that the Kd （490） in Yangtze River Estuary＇s adjacent area were increased with decreasing distance from the shore, the maximum value of Kd （490） reached 1.8 m^-1 , the Kd （490） in Hangzhou Bay＇s adjacent area were similar to this result, the maximum value of Kd （490） appeared near the Zhoushan island, which reached 2.8m 1. The dominant factor of diffuse attenuation coefficient was total suspended matter, the correlation was more than 0.86, the CDOM and Chla have a little influence on the Kd（490）, the correlation was less than 0.25. The new model to calculate Kd（490） which was lg[Kd（490）]=a[Rrs（590）/Rrs（510）] ＋ b[Rrs（670）/Rrs（510）], comparing situ data with the calculated Kd （490） shows that the root mean square error is 0. 098m^-1 , the absolute percentage difference is 12.43%, the coefficient of correlation＇s square is 0. 916; the relationship between Kd（490） andKd（PAR） was Kd（PAR）=0.495exp （0.8602Kd（490））-0.2217, comparing situ data with the calculated Kd（PAR） shows that the root mean square error is 0. 102m^-1, the absolute percentage difference is 14.62%, the coefficient of correlation＇s square is 0. 927.