咸水湖泊对全球变化尤为敏感，光学与微波遥感为系统监测咸水湖泊环境变化提供了最为可行的技术手段。目前国内外缺乏对咸水湖泊盐度介电特性与水质参数光学特性的系统研究，阻碍了咸水湖泊水质遥感的发展。本项目以咸水湖泊固有（IOPs）-表观（AOPs）-偏振-介电特性的关系为主线，通过野外实验、室内分析与模拟实验等主要技术手段获得相关数据。重点关注高剂量太阳辐射作用下咸水湖泊CDOM光学特性、组分变化的时空特征与主控因子；光学活性物质IOPs-AOPs及IOPs-偏振特性的相互作用机制；耦合生物光学与矢量辐射传输模型，阐明水体与水表偏振特性的关系；基于标量与偏振特性反演水体IOPs与水质参数；研究不同离子类型盐湖的介电特性，并构建盐度反演模型。本研究对系统认识咸水湖泊光学与介电特性，改进咸水湖泊水质遥感反演方法，提升遥感技术在咸水湖泊环境变化监测中的作用具有重要的理论与应用价值。

Saline Lakes in the endoheic regions are especially sensitive to climate change. Due to the remote and harsh environmental settings, and inconvenient accessibility, optical and microwave remote sensing technology provides the only practical approach for monitoring the aquatic environment change for saline lakes. Till to now, there lack a systematic research on dielectric constant and bio-optical properties of saline waters, which hinders the saline water quality monitoring with remotely sensed data. In this proposal, the inherent optical properties (IOPs), apparent optical properties (AOPs), polarized light properties, and dielectric constant of saline waters and the relationships with respect to optically active constituent (OACs), and salinity will be systematically investigated. Data set for this research will be collected, measured or simulated through field campaigns, laboratory analysis, and simulation based on tank experimentation concerning optical, polarized light and dielectric properties, combined with radiative transfer modeling based on the coupling of Hydrolight and RayXP for examining the relationship between IOPs and AOPs, and IOPs and polarized light properties of saline waters. Efforts will be devoted to: 1) examine the optical properties of CDOM, its components and source of saline waters based on fluorescence spectroscopy; 2) the IOPs influences on AOPs and polarized light properties will be systematically investigated in this research, and sensitivity analysis will be carried out to find out the dominant controlling IOP parameters for AOPs and polarized light properties; 2) the relationship between salinity and dielectric constant with respect to saline categories of waters; 3) the relationship between salinity and dielectric constant, as well as salinity and polarized degrees, with respect to saline categories of waters. At last, remote sensing models will be established for different water quality parameters and IOPs in these saline lakes, and salinity inversion models will be established based on scalar water leaving radiance, dielectric and polarized light properties. The potential results from this project will broaden our knowledge on bio-optical and dielectric properties for saline waters, and remote estimate models for water quality of saline waters will be established or improved through implementation of this project. Further, the proposed findings from this project will greatly advance remote sensing for water quality monitoring of saline waters residing in harsh and remote regions for systemic assessing aquatic environmental change of these waters.