悬浮颗粒矿物成分对近岸水体光学参数的影响及光谱响应研究

Hydrolic optical property play important role in photochemical and ecological process in upper euphotic layer. Underwater light field in Case Ⅱ waters is highly affected by mineral suspended particles, in which mineral composition is one important factor. Mineral composition contributes strongly to water optical properties, such as absorption and scattering, and light transfer processes in the water. It's also an important factor whether light transmission simulation can be closed and has great influence on significant difference among different regional particle-mass retrieval models from optical remote sensing. Therefore, research of the influence of mineral composition on water optical properties and spectral response benefits not only for understanding alongshore water optical properties, but also for developing traditional remote sensing paradigm and high-precision regional algorithms of optical remote sensing. However, this kind of topic is rare in the previous research for the China coastal waters. This project focuses on understanding the mechanisms of mineral composition affecting water optical properties. It will be performed by using laboratory measurement and theoretical analysis. The research contents include the mineral assemblage characteristics of representative coastal waters, the effect of mineral composition on the water spectral-specific absorption(ap) and scattering properties(bp), the quantitative relationship between ap,bp and mineral contents, the contributions of mineral composition on spectrum, and evaluating the influence of mineral typomorphic characteristic on mass-specific retrieval algorithms of optical remote sensing in different coastal waters in China. This project involves ocean optical and biogeochemical disciplines and try to answer the following scientific questions. How mineral composition affects the IOPs? What forms can quantitative relation to be build? The research results will contribute to partition of regional optical active substance and approach the full understand of optical properties in the coastal waters. The results will provide knowledge of developing high-precise mass-specific retrieval algorithms in the China seas.

水体光学性质对真光层光化学反应过程和生态过程均有重要影响，悬浮颗粒矿物成分影响着水体吸收和散射等光学特性，是影响水体光传输模拟的重要因素，也是导致不同近岸水体水色要素反演模式存在显著差异的原因之一。开展悬浮颗粒矿物成分对近岸海域复杂水体光学性质及表观光谱响应研究具有重要的科学意义，但在以往中国近岸海域的研究中很少涉及。本项目拟主要通过实验测量、理论模拟，对典型河口海域悬浮颗粒的矿物组合特征进行研究，分析不同矿物成分颗粒的光吸收和散射特性，就不同矿物成分对水体光学参数影响进行定量描述，研究表观反射光谱对水体颗粒不同矿物成分组成的响应，在以上探讨基础上分析悬浮颗粒矿物组成对近岸水体光学特性的影响。本项目涉及海洋光学和生物地球化学领域的交叉，试图解决颗粒矿物成分对水体光学性质的影响和定量描述的关键科学问题，可为解析区域水体光学性质差异、发展我国区域水色要素遥感精化算法提供参考。

悬浮颗粒矿物成分影响着水体吸收和散射等光学特性，是影响水体光传输模拟的重要因素，也是导致不同近岸水体水色要素反演模式存在显著差异的原因之一。本项目分别选取黄河口、长江口、珠江口、渤海湾、苏北浅滩、鄱阳湖等典型二类水体环境的表层沉积物样品进行不同矿物结构、不同浓度梯度的配比，采用ASD、AC-S、HS6、浊度计等光学仪器，基于自行设计的实验水槽测量系统进行水体表观光学特性（AOPs）和固有光学特性（IOPs）的全面测量，开展悬浮颗粒矿物成分对近岸海域复杂水体光学性质及表观光谱响应研究，获得了我国不同河口、近岸海域、湖泊水体的悬浮颗粒矿物组合特征，解析了实验环境下不同矿物成分颗粒的光吸收和散射特性，构建了我国不同典型二类水体下的纯矿物颗粒浓度的反演算法，比较其差异性来源；以浓度-矿物含量为维度，分别对后向散射系数、吸收系数和遥感反射率的分布差异进行解析，在以上探讨基础上系统分析悬浮颗粒矿物组成以及粒径等对近岸水体光学特性的影响，结合黄河口、渤海海峡和北部湾等外业测量工作探讨了不同近岸环境的悬浮颗粒遥感反演的差异性。本项目基于实验光学测量系统的条件控制，打破传统水色三要素的研究框架，着力解决颗粒矿物成分对水体光学性质的影响和定量描述的关键科学问题，可为解析区域水体光学性质差异、发展我国区域水色要素遥感精化算法提供参考。