研究目的
To improve the understanding of the effects of complex vertical profiles of SPM on Rrs.
研究成果
The study demonstrated that nonuniform vertical profiles of suspended particles significantly affect remote sensing reflectance, with potential overestimation or underestimation depending on the profile type. A dimensionless parameter was established to quantify these effects, contributing to the understanding of water vertical structure information in remote sensing reflectance.
研究不足
The study focused on optically complex waters with high turbidity and low concentration of phytoplankton, potentially limiting its applicability to other water types. The simulation did not account for all possible vertical profiles of SPM, focusing only on four typical types.
1：Experimental Design and Method Selection:
The study used in situ data and a forward radiative transfer model to simulate nonuniform vertical profiles of suspended particles in Poyang Lake. The Hydrolight radiation transfer model was employed for accurate simulation of water optical properties.
2：Sample Selection and Data Sources:
Field measurements of SPM concentration, absorption coefficient of CDOM, and particulate attenuation, absorption, and scattering coefficients were conducted in Poyang Lake.
3：List of Experimental Equipment and Materials:
Equipment included an Ocean Optical HR2000 spectrometer, a light source, a Liquid Waveguide Capillary Cell (LWCC), and an AC-S (WET Labs, USA).
4：Experimental Procedures and Operational Workflow:
The simulation considered only inorganic particles and CDOM, with input parameters including sun zenith angle, particle phase function, particulate backscattering ratio, wind speed, and water depth.
5：Data Analysis Methods:
The relative difference between remote-sensing reflectance of nonuniform water column and that of the corresponding uniform case was calculated to analyze the sensitivity of Rrs.
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