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Spectral variability of the particulate backscattering ratio

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https://ir.library.oregonstate.edu/concern/articles/37720f318

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  • The spectral dependency of the particulate backscattering ratio is relevant in the fields of ocean color inversion, light field modeling, and inferring particle properties from optical measurements. Aside from theoretical predictions for spherical, homogeneous particles, we have very limited knowledge of the actual in situ spectral variability of the particulate backscattering ratio. This work presents results from five research cruises that were conducted over a three-year period. Water column profiles of physical and optical properties were conducted across diverse aquatic environments that offered a wide range of particle populations. The main objective of this research was to examine the behavior of the spectral particulate backscattering ratio in situ, both in terms of its absolute magnitude and its variability across visible wavelengths, using over nine thousand 1-meter binned data points for each of five wavelengths of the spectral particulate backscattering ratio. Our analysis reveals no spectral dependence of the particulate backscattering ratio within our measurement certainty, and a geometric mean value of 0.013 for this dataset. This is lower than the commonly used value of 0.0183 from Petzold’s integrated volume scattering data. Within the first optical depth of the water column, the mean particulate backscattering ratio was 0.010.
  • This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/home.cfm. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
  • Keywords: Particles, Scattering, Atmospheric and oceanic optics, Backscattering
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  • Whitmire, A. L., Boss, E., Cowles, T. J., & Pegau, W. S. Spectral variability of the particulate backscattering ratio. Optics Express, 15(11), 7019-7031. http://dx.doi.org/10.1364/OE.15.007019
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  • 15
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  • 11
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  • A. Whitmire was supported by the National Sea Grant College Program of the U.S. Department of Commerce’s National Oceanic and Atmospheric Administration under NOAA grant number NA060AR4170010 (project number E/INT-61-IFP), and by appropriations made by the Oregon State legislature. Emmanuel Boss acknowledges grant N00014-04-1- 0710 of the Environmental Optics and Biology program of the Office of Naval Research.
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