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A Semi-analytical Model for Diffuse Reflectance in Marine and Inland Waters : Volume 12, Issue 4 (19/08/2015)

By Pravin, J. D.

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Book Id: WPLBN0004020879
Format Type: PDF Article :
File Size: Pages 20
Reproduction Date: 2015

Title: A Semi-analytical Model for Diffuse Reflectance in Marine and Inland Waters : Volume 12, Issue 4 (19/08/2015)  
Author: Pravin, J. D.
Volume: Vol. 12, Issue 4
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Ahn, Y., Shanmugam, P., & Pravin, J. D. (2015). A Semi-analytical Model for Diffuse Reflectance in Marine and Inland Waters : Volume 12, Issue 4 (19/08/2015). Retrieved from http://worldlibrary.net/


Description
Description: Ocean Optics and Imaging Laboratory, Department of Ocean Engineering, Indian Institute of Technology Madras, Chennai, 600036, India. 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.

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

Excerpt
Ahn, Y.-H. and Shanmugam, P.: Derivation and analysis of the fluorescence algorithms to estimate phytoplankton pigment concentrations in optically complex coastal waters, J. Opt. A-Pure Appl. Op., 9, 352–362, doi:10.1088/1464-4258/9/4/008, 2007.; Albert, A. and Mobley, C. D.: An analytical model for subsurface irradiance and remote sensing reflectance in deep and shallow case-2 waters, Opt. Express, 11, 2873–2890, doi:10.1364/OE.11.002873, 2003.; Dev, P. J. and Shanmugam, P.: A new theory and its application to remove the effect of surface-reflected light in above-surface radiance data from clear and turbid waters, J. Quant. Spectrosc. Ra., 142, 75–92, doi:10.1016/j.jqsrt.2014.03.021, 2014a.; Dev, P. J. and Shanmugam, P.: New model for subsurface irradiance reflectance in clear and turbid waters, Opt. Express, 22, 9548–9566, doi:10.1364/OE.22.009548, 2014b.; Gokul, E. A., Shanmugam, P., Sundarabalan, B., Sahay, A., and Chauhan, P.: Modelling the inherent optical properties and estimating the constituents' concentrations in turbid and eutrophic waters, Cont. Shelf Res., 84, 120–138, doi:10.1016/j.csr.2014.05.013, 2014.; Gordon, H. R., Brown, O. B., and Jacobs, M. M.: Computed relationships between the inherent and apparent optical properties of a flat homogeneous ocean, Appl. Opt., 14, 417–27, 1975.; Hirata, T.: Irradiance inversion theory to retrieve volume scattering function of seawater, Appl. Opt., 42, 1564–73, 2003.; Hirata, T. and Højerslev, N. K.: Relationship between the irradiance reflectance and inherent optical properties of seawater, J. Geophys. Res., 113, C03030, doi:10.1029/2007JC004325, 2008.; Kirk, J. T. O.: Dependence of relationship between inherent and apparent optical properties of water on solar altitude, Limnol. Oceanogr., 29, 350–356, doi:10.4319/lo.1984.29.2.0350, 1984.; Loisel, H. and Morel, A.: Non-isotropy of the upward radiance eld in typical coastal (Case 2) waters, Int. J. Remote Sens., 22, 275–295, 2001.; Maritorena, S., Morel, A., and Gentili, B.: Diffuse reflectance of oceanic shallow waters: influence of water depth and bottom albedo, Limnol. Oceanogr., 39, 1689–1703, doi:10.4319/lo.1994.39.7.1689, 1994.; Mobley, C. D.: Light and Water: Radiative Transfer in Natural Waters, Academic Press, Inc., San Diego, 1994.; Mobley, C. D.: Informal Notes on Reflectances, Sequoia Scientific, Inc, Bellevue, WA 98005, 2005.; Thomas, G. E. and Stamnes, K.: Radiative Transfer in the Atmosphere and Ocean, Cambridge University Press, 73–77, 2002.; Morel, A. and Gentili, B.: Diffuse reflectance of oceanic waters: its dependence on Sun angle as influenced by the molecular scattering contribution, Appl. Opt., 30, 4427–4438, 1991.; Morel, A. and Gentili, B.: Diffuse reflectance of oceanic waters. II. Bidirectional aspects, Appl. Opt., 32, 6864–6879, 1993.; Morel, A. and Gentili, B.: Diffuse reflectance of oceanic waters. III. Implication of bidirectionality for the remote-sensing problem, Appl. Opt., 35, 4850–4862, 1996.; Morel, A. and Prieur, L.: Analysis of variations in ocean color, Limnol. Oceanogr., 22, 709–722, doi:10.4319/lo.1977.22.4.0709, 1977.; Okami, N., Kishino, M., Sugihara, S., and Unoki, S.: Analysis of ocean color spectra (I) – calculation of irradiance reflectance, J. Oceanogr. Soc. Japan, 38, 208–214, 1982.; Roesler, C. S. and Boss, E.: Spectral beam attenuation coefficient retrieved from ocean color inversion

 

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