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Optical propagation within a three-dimensional shadowed atmosphere-ocean field: application to large deployment

John P Doyle1, Giuseppe Zibordi

  • 1Department of Computational Physics and Geophysics, T. H. Huxley School, Imperial College of Science, Technology, and Medicine, University of London, UK. j.doyle@ic.ac.uk

Applied Optics
|August 1, 2002
PubMed
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Optical shadowing from deployment structures can decrease radiometric data by 1-10%. This study uses Monte Carlo simulations to create correction factors for accurate in-situ submerged light measurements, improving oceanographic data reliability.

Area of Science:

  • Ocean optics
  • Radiative transfer theory
  • In-situ optical measurements

Background:

  • In-situ submerged optical measurements are crucial for understanding oceanographic processes.
  • Large deployment structures can cause significant optical shadowing, affecting data accuracy.
  • Accurate radiometric data is essential for oceanographic research and monitoring.

Purpose of the Study:

  • To estimate and correct for optical shadowing effects on submerged radiance and irradiance measurements.
  • To develop a methodology for removing tower-shading uncertainties in radiometric data.
  • To provide a transferable correction method for various deployment systems and sites.

Main Methods:

  • Utilized backward Monte Carlo techniques and variance reduction schemes.

Related Experiment Videos

  • Performed 3D radiative transfer computations considering realistic atmosphere-ocean system parameters.
  • Conducted sensitivity analysis to identify significant parameters and computed correction factors.

    • Main Results:

    • Quantified optical shadowing effects causing a 1-10% decrease in radiometric data values.
    • Developed extensive look-up tables of correction factors for operational use.
    • Demonstrated the impact of geometric, environmental, and optical parameters on light field perturbations.

    Conclusions:

    • The proposed Monte Carlo simulation method effectively estimates and corrects optical shadowing.
    • Correction factors derived can be applied to mitigate shading uncertainties in oceanographic tower measurements.
    • The methodology is adaptable to other deployment systems and measurement locations with proper parameterization.