基于LIF海水表层CDOM荧光特性仿真和实验研究

doi:10.3964/j.issn.1000-0593(2025)04-1116-07

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Abstract Colored dissolved organic matter (CDOM), a key substance in the global carbon cycle and climate change, is important in studying marine environmental monitoring for its fluorescence characteristics. Laser-induced fluorescence (LIF) technology, as an active remote sensing optical detection method, provides an effective tool for studying CDOM. This article aims to investigate the fluorescence characteristics of CDOM through a combination of simulation and experimentation, providing a theoretical basis for detecting CDOM in the surface layer of seawater using LIF.Firstly, the Monte Carlo method is utilized to simulate the fluorescence radiation process of CDOM in the surface layer of seawater. This approach allows for the analysis of fluorescence simulation results of CDOM under various conditions, including different concentrations of CDOM, incident light zenith angles, and fluorescence receiving angles. Subsequently, an LIF system is established through an experimental setup to detect CDOM solutions configured with fulvic acid and humic acid as characteristic extracts. This system's fluorescence spectra are obtained for different CDOM concentrations, system detection parameters, and environmental factors such as temperature, pH value, and salinity.The characteristics of these fluorescence spectra are then analyzed. Finally, the impact of environmental factors on the fluorescence spectra of CDOM is studied by combining single-factor variation analysis with multi-factor response surface analysis. Simulation and experimental results indicate a negative correlation between CDOM fluorescence and the incident zenith angle of excitation light. CDOM fluorescence intensity is relatively high when the emission angle is within the range of 0°～60°, which can provide a reference for the selection of incident and receiving angles of excitation light during the actual detection of CDOM using LIF;As the concentration of CDOM increases, the fluorescence intensity continues to rise. However, after reaching a certain concentration, the fluorescence intensity decreases as the concentration further increases; The effects of environmental factors such as temperature, pH, and salinity on CDOM were studied through single-factor analysis. The results indicate that as the temperature rises, the fluorescence intensity of CDOM gradually decreases. When the marine environment is strongly alkaline, the fluorescence spectrum of CDOM undergoes significant changes. Among the effects of salinity on CDOM, the impact on fulvic acid is greater than that on humic acid. Subsequently, the impact of multiple factors on the fluorescence properties of CDOM under their combined effects is analyzed using the response surface method. By observing the steepness of the response surface of the CDOM fluorescence peak, it can be found that the order of the influence of various factors on the fluorescence intensity of CDOM is pH, temperature, and salinity. These results indicate that the influence of environmental factors must be considered when using LIF to detect CDOM.

Key words：Laser-induced fluorescence; Colored dissolved organic matter; Fluorescence intensity; Environmental factor

Received: 2024-04-03 Accepted: 2024-07-25

ZTFLH:

P733.3

Cite this article:

XIE Bei-bei,WANG Ying-jie,GAO Wang, et al. Simulation and Experimental Study on the Fluorescence Characteristics of CDOM in Seawater Surface Based on LIF[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2025, 45(04): 1116-1122.

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https://www.gpxygpfx.com/EN/10.3964/j.issn.1000-0593(2025)04-1116-07 OR https://www.gpxygpfx.com/EN/Y2025/V45/I04/1116

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