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    Ocean light attenuation varies with depth, influenced by chlorophyll-a concentration. Higher surface chlorophyll leads to shallower depths of negligible light penetration, impacting underwater communication link design.

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    Area of Science:

    • Oceanography
    • Optical Oceanography
    • Biogeochemical Oceanography

    Background:

    • Light attenuation in the ocean is a critical factor for underwater visibility and communication.
    • Chlorophyll-a concentration significantly influences light absorption and scattering.
    • Understanding depth-dependent attenuation is essential for designing effective underwater optical systems.

    Purpose of the Study:

    • To model depth variations in oceanic light attenuation coefficient.
    • To relate these variations to chlorophyll-a concentration and depth profiles.
    • To identify optimal depths for underwater communication links.

    Main Methods:

    • Utilized a one-parameter model based on chlorophyll-a concentration (C(c)).
    • Incorporated experimentally-determined Gaussian chlorophyll-depth profiles.
    • Related chlorophyll depth profiles to surface chlorophyll levels (0-4 mg/m³).

    Main Results:

    • Calculated shallower depths of negligible chlorophyll-a for higher surface chlorophyll concentrations.
    • Determined minimum oceanic attenuation of 0.0092 m⁻¹ at 430 nm below a specific depth.
    • Quantified attenuation between locations using satellite surface-chlorophyll data.

    Conclusions:

    • Depth of negligible light penetration is inversely related to surface chlorophyll-a.
    • Minimum oceanic attenuation occurs at specific depths, crucial for communication link optimization.
    • The model enables quantification of underwater light attenuation for applications in secure and low-noise optical communication.