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Ocean Science An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/osd-12-1893-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/osd-12-1893-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Submitted as: research article 19 Aug 2015

Submitted as: research article | 19 Aug 2015

Review status
This discussion paper is a preprint. It has been under review for the journal Ocean Science (OS). The revised manuscript was not accepted.

A semi-analytical model for diffuse reflectance in marine and inland waters

J. D. Pravin1, P. Shanmugam1,2, and Y.-H. Ahn2 J. D. Pravin et al.
  • 1Ocean Optics and Imaging Laboratory, Department of Ocean Engineering, Indian Institute of Technology Madras, Chennai, 600036, India
  • 2Korea Ocean Satellite Research Center, KIOST, Seoul 425-600, Korea

Abstract. A semi-analytical model for predicting diffuse reflectance of coastal and oceanic waters is developed based on the water-column optical properties and illumination conditions. Diffuse reflectance (R) is an apparent optical property that is related to the Gordon's parameter (bb/(a+bb)) through a proportionality factor "f". The conventional assumption of "f" as a constant (0.33) yields large errors in case of turbid and productive coastal waters and a predictive model based on this assumption is generally restricted to open-ocean waters (low chlorophyll case). In this paper, we have sorted the dependent factors that influence "f" values in the water column. Here, the parameter "f" is modeled as a function of wavelength, depth, inherent optical properties (IOPs) and illumination conditions. This work eliminates the spectral constants (KChl and KSS) associated with our previous model and constrains the present model to be solely dependent on the IOPs and illumination conditions. Data used for parameterization and validation are obtained from in situ measurements in different waters within coastal environments. Validation shows good agreement between the model R and in situ R values with the overall mean relative error of less than a few percent. The model is valid for a wide range waters within coastal and open-ocean environments.

J. D. Pravin et al.
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J. D. Pravin et al.
J. D. Pravin et al.
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