Ocean optical source estimation with widely spaced irradiance measurements

Area of Science:

• Ocean optics
• Photochemistry
• Remote sensing

Background:

• Accurate determination of underwater light source distribution is crucial for various marine science applications.
• Existing methods may be limited by measurement constraints or environmental variability.

Purpose of the Study:

• To develop and validate a novel algorithm for determining the spatial distribution of light sources in seawater.
• To assess the algorithm's robustness against factors like sensor noise and optical property uncertainties.

Main Methods:

• The method utilizes downward and upward irradiance measurements at a single wavelength.
• It employs an algorithm that solves two nonlinear equations to fit exponential or linear source shapes.
• Complex source shapes are estimated by combining results from adjacent measurement pairs.

Main Results:

• The algorithm successfully estimates source shapes using measurements at two depths.
• Numerical tests demonstrate sensitivity to depth, spacing, chlorophyll, noise, and optical property uncertainties.
• The method performs well with widely spaced measurements and moderate noise, irrespective of assumed profile shapes.

Conclusions:

• The developed method provides a reliable way to map underwater light source distributions.
• It is robust to common sources of error in marine optical measurements.
• This technique enhances the ability to study light dynamics in aquatic environments.