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Infrared (IR) Spectroscopy: Overview

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Using MazeSuite and Functional Near Infrared Spectroscopy to Study Learning in Spatial Navigation
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Ocean inherent optical property estimation from irradiances.

R A Leathers, N J McCormick

    Applied Optics
    |February 12, 2008
    PubMed
    Summary

    This study introduces a method to estimate ocean optical properties, specifically absorption and backscattering coefficients, using irradiance measurements. The approach accurately determines these coefficients in deep waters and offers improvements for shallow water applications.

    Area of Science:

    • Ocean optics
    • Remote sensing
    • Inherent optical properties

    Background:

    • Accurate estimation of inherent optical properties (IOPs) is crucial for understanding aquatic environments.
    • Traditional methods can be complex or limited in certain water conditions.

    Purpose of the Study:

    • To develop and evaluate a method for estimating the absorption coefficient (a) and backscattering coefficient (b(b)) from irradiance measurements.
    • To assess the method's applicability in various water types, including deep, stratified, and shallow waters.

    Main Methods:

    • Utilizing upward and downward irradiances (E(u)(z), E(d)(z)) to derive reflectance ratio (R(z)) and diffuse attenuation coefficient (K(d)(z)).
    • Estimating asymptotic values of R(infinity) and K(infinity) from R(z) and K(d)(z).

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  • Applying radiative transfer theory to correlate R(infinity) and K(infinity) with absorption (a) and backscattering (b(b)) coefficients for an assumed scattering phase function.

    • Main Results:

    • The method provides good estimates of absorption (a) and the Gordon parameter (G) when the assumed scattering phase function closely matches the true function.
    • The technique is most effective in deep, homogeneous waters but can be adapted for stratified waters.
    • Developed reflectance models for deep and shallow waters to enhance performance, particularly in optically shallow environments.

    Conclusions:

    • The proposed method offers a reliable way to derive key inherent optical properties from readily available irradiance data.
    • The method's robustness is demonstrated in deep waters, with extensions for shallow water scenarios improving its practical utility.
    • Accurate IOPs estimation is vital for oceanographic research and monitoring, and this method contributes to advancing these capabilities.