基于导数光谱的混浊河口水体叶绿素浓度反演  

Retrieval of chlorophyll a concentrations in turbid waters based on hyperspectrum derivatives

作　　者：史合印[1,2] 邢前国[1,3] 陈楚群[1] 施平[1,3] 刘亚龙[3] 

机构地区：[1]中国科学院南海海洋研究所热带海洋环境动力学重点实验室,广东广州510301 [2]广州市海洋与渔业环境监测中心,广东广州510235 [3]中国科学院烟台海岸带研究所,山东烟台264003

出　　处：《海洋环境科学》2010年第4期575-578,共4页Marine Environmental Science

基　　金：广东省重点基金(06105018);山东省科技攻关项目(2007GG2QT06019);中科院知识创新项目(KZCX2-YW-Q07-01)

摘　　要：基于2004年5月和2006年8月于珠江口现场实测的遥感反射率光谱及叶绿素浓度数据,采用导数光谱技术,对高光谱在河口浑浊水体的叶绿素反演的应用进行了研究。结果表明,二阶导数光谱的特征波段较原始光谱、一阶导数光谱对浑浊水体的叶绿素含量更为敏感;当水体浊度变化范围为10～130 NTU,光谱分辨率为10 nm、中心波长为620 nm、670 nm及680 nm的二阶导数光谱与叶绿素浓度(1～50μg/L)呈显著相关(线性相关系数分别为0.75、0.85及0.7);基于670 nm处二阶导数光谱的简单线性模型对叶绿素浓度有较好的反演精度。该结果可为光学复杂水体的叶绿素高光谱遥感估算提供新的方法。Based on May 2004 and Aug.2006 in the Pearl River Estuary measured at the scene of the remote sensing reflectance spectra and chlorophyll concentration data,the use of derivative spectroscopy,spectroscopy of high turbidity in the estuary water body of the application of inversion of chlorophyll were studied.The results show that the second derivative spectra of the characteristics of spectral bands than the original,first-order derivative spectra of turbid water is more sensitive to the chlorophyll content.When the water turbidity changes in the range of 10～130 NTU,the spectral resolution of 10nm,the center wavelength for 620 nm,670 nm and 680 nm of the second derivative spectra and chlorophyll concentration（1～50 μg/L） were significantly correlated（linear correlation coefficients were 0.75,0.85 and 0.7）.670nm based on second derivative spectra department of simple line chlorophyll concentration of model inversion better accuracy.The results can provide a new method for the estimation to the complicated optical water hyperspectral remote sensing of chlorophyll.

关 键 词：高光谱 导数光谱 叶绿素-A 珠江口 

分 类 号：X87[环境科学与工程—环境工程]