影响水体CDOM液芯波导测量的关键问题研究

水中的有色溶解有机物（CDOM）对水体生态系统具有重要影响，开展CDOM液芯波导测量关键问题研究具有重要的理论意义和现实价值。本申请项目拟：1）搭建基于多种液芯波导池的温度可控自动测量分析系统，开展液芯波导材质、光程长度（包括物理长度与有效光程差异）、孔径、壁厚等差异对吸收光谱差异的影响；2）分析测量样品温度、盐度、pH值等因素的差异对吸收光谱差异的影响；3）从液芯波导特性、样品特性两方面综合分析影响CDOM测量效果的关键因子，结合理论计算手段，建立综合改进模型，选择南海、珠江口、鄱阳湖分别为海洋、河口、湖泊代表性研究区域，开展即时现场测量与冻融存储后实验室分析结果差异分析，并进行CDOM测量综合改进方案的适用性与稳定性检验研究，以期提高CDOM液芯波导测量效率与精度，尝试为实现CDOM的高效高精度走航与原位测量提供基础支撑。

Chromophoric Dissolved Organic Matter (CDOM) content in oceans, estuaries and lakes are regulators of carbon cycling and climate. Measurements of CDOM are critical to capture and understand the dynamics of dissolved organic carbon and affects on aquatic ecosystem. Standard spectrophotometric methods for CDOM determination using Liquid Core Waveguide (LCW) system are laborious and susceptible to methodological biases. The project is committed to: 1) To evaluate the accuracy, sensitivity and precision of different materials, optical path lengths, inner diameters, thickness of LCW on CDOM measurements by building out an automatic controlled measurement system. 2) To analysis uncertainties in (CDOM) spectral absorption features due to temperature, salinity and PH variations. 3) To determine key factors for CDOM measurements and improved models to facilitate the precision as well as efficiency in CDOM measurements substantially; to conduct field measurement in the South China Sea (ocean), the Pearl River Estuary (estuary) and the Poyang Lake (inland lake) as preliminary efforts to provide significant enhancements for routine cruise and in situ CDOM absorption measurements in a broad range of natural waters.