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Related Experiment Video

Updated: Jun 21, 2026

Small Volume (1-3L) Filtration of Coastal Seawater Samples

Small Volume (1-3L) Filtration of Coastal Seawater Samples

Published on: June 19, 2009

Scattering by pure seawater at high salinity.

Xiaodong Zhang¹, Lianbo Hu

¹Department of Earth System Science and Policy, University of North Dakota, Grand Forks, ND 58202, USA. zhang@aero.und.edu

|August 6, 2009

Summary

A new model accurately predicts seawater scattering using Gibbs function, extending previous salinity ranges. This model improves upon older methods, offering more reliable predictions for various oceanic conditions.

Area of Science:

Ocean Optics
Physical Oceanography
Thermodynamics

Background:

Seawater scattering is influenced by density fluctuations, which are thermodynamically controlled.
Existing models for seawater scattering have limitations in their salinity ranges.
Accurate prediction of light scattering is crucial for understanding ocean optical properties.

Purpose of the Study:

To develop a new model for seawater scattering based exclusively on Gibbs function.
To derive thermodynamic parameters associated with density fluctuation for scattering.
To validate the model's performance across an extended range of salinities.

Main Methods:

Utilized Gibbs function to derive thermodynamic parameters linked to density fluctuation.
Empirically determined Gibbs function from highly accurate thermodynamic variable measurements.

More Related Videos

Large Volume (20L+) Filtration of Coastal Seawater Samples

Large Volume (20L+) Filtration of Coastal Seawater Samples

Published on: June 18, 2009

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Last Updated: Jun 21, 2026

Small Volume (1-3L) Filtration of Coastal Seawater Samples

Small Volume (1-3L) Filtration of Coastal Seawater Samples

Published on: June 19, 2009

Large Volume (20L+) Filtration of Coastal Seawater Samples

Large Volume (20L+) Filtration of Coastal Seawater Samples

Published on: June 18, 2009

Compared model predictions with existing experimental data (Morel, 1968) and another model (ZHH09).

Main Results:

The new model shows good agreement with Morel's measurements (-0.6% at S=0, 2.7% at S=38.4).
Seawater scattering increases non-linearly with salinity; linear extrapolation can overestimate by 30%.
The new model aligns within +/- 2.5% with the ZHH09 model over the entire salinity range.

Conclusions:

The developed model is expected to be valid for extended salinity ranges (up to 120 g kg(-1)).
Linear extrapolation of scattering based on older data can lead to significant overestimation.
The new model offers a reliable method for estimating seawater scattering, even at high salinities.