研究目的
To investigate the anomalous behavior of light scattering by pure water and pure seawater using the latest scattering models, focusing on temperature and salinity effects.
研究成果
The study confirms that pure water exhibits anomalous light scattering with a minimum at 24.6 °C, differing from previous reports. For seawater, the minimum scattering temperature increases with salinity, reaching 27.5 °C at 40 psu, primarily due to concentration fluctuations. This behavior is spectrally consistent. The Buiteveld et al. model is cautioned against due to inconsistencies with measurements and this study's results.
研究不足
The study assumes a constant depolarization ratio (δ) of 0.039 for both pure water and seawater, as no data on its variation with salinity is available. The models are based on theoretical derivations and may be sensitive to uncertainties in input parameters, such as refractive index derivatives. The analysis is limited to temperatures 0–60 °C and salinities 0–40 psu under atmospheric pressure, and does not account for pressure effects or potential variations in δ.
1：Experimental Design and Method Selection:
The study utilized theoretical models based on the Einstein–Smoluchowski equation and refined models for light scattering by pure water and seawater, incorporating density and concentration fluctuations. Equations (1)-(3) from the paper were used to calculate scattering coefficients.
2：Sample Selection and Data Sources:
The analysis focused on pure water and seawater with salinities from 0 to 40 psu, temperatures from 0 to 60 °C, and atmospheric pressure, based on existing thermodynamic parameter measurements and models.
3：List of Experimental Equipment and Materials:
No specific experimental equipment or materials were used as the study is computational, relying on models and data from literature.
4：Experimental Procedures and Operational Workflow:
The methodology involved calculating scattering coefficients using the provided equations and MATLAB code (accessible at https://goo.gl/jKAZgT), with inputs from refined models of refractive index, density, isothermal compressibility, and other parameters.
5：Data Analysis Methods:
Results were compared with previous measurements (e.g., Cohen and Eisenberg, 1965) and models (e.g., Buiteveld et al., 1994), using normalization and root mean square difference for validation.
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