激光诱导荧光装置用于海水可溶性有机物测量（英文）

Development of laser fluorometer system for CDOM measurements

水体可溶性有机物(也叫黄色物质,CDOM),直接影响水体光学特性和遥感光谱特征,在水体生态系统、光学遥感、海洋碳循环中都发挥重要的作用。针对现有水体黄色物质(CDOM)常规测量需要对水样进行过滤等耗时耗力预处理过程,研制了一种水体黄色物质快速测量的可用于实验室及野外分析的激光诱导荧光仪,该仪器集成了405 nm激光激发、高光谱接收和特征荧光光谱解析技术,使得激光雷达能够从各种成分的叠加信号中分离和确认出特定组分。此外,在实验室测量和分析了温度对于CDOM荧光光谱的影响,并提出了一种荧光数据的温度校正算法。该仪器在中国东海2013年4月的测量结果与常规仪器测量结果具有显著的相关性(R^2=0.83),揭示了激光诱导荧光技术在CDOM实时监测上的应用潜力。

The colored fraction of dissolved organic matter,CDOM,directly influences water optical properties and spectral quality,playing an important role in aquatic ecosystems,optical remote sensing and carbon circulation in the sea.Measuring in situ CDOM absorption coefficient,however,is difficult because it requires prefiltration of water samples.An analytical laboratory and field instrument for fast diagnosis of chromophoric dissolved organic matter(CDOM)in water was developed.The laser fluorometer was integrated with spectral fluorescent signature(SFS)analysis of the laser stimulated emission excited at 405 nm and hyper spectra for surveillance of CDOM.CDOM and water Raman scattering components were derived from the laser stimulated emission spectra measured in the laboratory and field conditions with SFS technology,which added to analytical Lidar sensing the capability of detecting and identifying trace substances in a variety of targets in the presence of other background matters responding to optical excitation with overlapping signals.The influence of temperature change on CDOM fluorescence data in water was investigated in laboratory,and a temperature calibration method was employed for calibrating fluorometer data.Laboratory and in-situ studies with the laser fluorometer in the East China Sea(ECS)in April 2013 were carried out.Significant and positive correlation in the ECS was observed between CDOM absorption measurements and CDOM fluorescence(R2=0.83).The result demonstrated the possibilities of CDOM monitoring in real time based upon the laser fluorometer.