Sensitivity analysis of volume scattering phase functions
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Sensitivity analysis of volume scattering phase functions

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  • Journal Title:
    Optics Express
  • Personal Author:
  • NOAA Program & Office:
    NOAA General Documents
  • Description:
    To solve the radiative transfer equation and relate inherent optical properties (IOPs) to apparent optical properties (AOPs), knowledge of the volume scattering phase function is required. Due to the difficulty of measuring the phase function, it is frequently approximated. We explore the sensitivity of derived AOPs to the phase function parameterization, and compare measured and modeled values of both the AOPs and estimated phase functions using data from Monterey Bay, California during an extreme “red tide” bloom event. Using in situ measurements of absorption and attenuation coefficients, as well as two sets of measurements of the volume scattering function (VSF), we compared output from the Hydrolight radiative transfer model to direct measurements. We found that several common assumptions used in parameterizing the radiative transfer model consistently introduced overestimates of modeled versus measured remote-sensing reflectance values. Phase functions from VSF data derived from measurements at multiple wavelengths and a single scattering single angle significantly overestimated reflectances when using the manufacturer-supplied corrections, but were substantially improved using newly published corrections; phase functions calculated from VSF measurements using three angles and three wavelengths and processed using manufacture-supplied corrections were comparable, demonstrating that reasonable predictions can be made using two commercially available instruments. While other studies have reached similar conclusions, our work extends the analysis to coastal waters dominated by an extreme algal bloom with surface chlorophyll concentrations in excess of 100 mg m−3.
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  • Source:
    Optics Express, 24(16), 18559
  • DOI:
  • ISSN:
    1094-4087
  • Format:
    PDF
  • Publisher:
    The Optical Society
  • Document Type:
    Journal Article
  • Rights Information:
    Other
  • Compliance:
    Library
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