水体叶绿素的偏振光谱特性

Polarization Spectral Feature of Chlorophyll in the Water Body

在实验室单一成分叶绿素水体与巢湖复杂水体的条件下,比较了基于反射率光谱与基于偏振度光谱所建模型精度上的区别。结果显示,对于复杂水质条件水体,在叶绿素蓝绿光特征波段处,偏振度光谱比反射率光谱具有更好地克服其他光学活性物质影响和保留叶绿素浓度信息的能力;而在红光特征波段处,两种光谱反演效果的差异性则较小。

The polarization spectrum of the water-leaving radiance provides intrinsic information about the composition of the water body from another point of view. In this study, we compared the inversion models developed with the degree of polarization（DOP） spectrum and reflectance spectrum in simple laboratory water body containing only chlorophyll and complex Chaohu water body respectively. The results enlighten that under the complex water conditions ,the DOP spectrum of the chlorophyll have greater capability of weakening the impacts of other water constituents and retrieving the concentrations of chlorophyll than reflectance spectrum in the blue-green band; while the difference is not obvious between the DOP and reflectance spectrum in the red band. It shows the independent characteristics of the DOP spectrum with respect to the reflectance spectrum, therefore, implies the potential applications of DOP spectrum method in water quality remote sensing.