Remote-sensing reflectance and true colour produced by a coupled hydrodynamic, optical, sediment, biogeochemical model of the Great Barrier Reef, Australia: Comparison with satellite data

Last modified: 
August 30, 2016 - 12:55am
Type: Journal Article
Year of publication: 2016
Date published: 04/2016
Authors: Mark Baird, Nagur Cherukuru, Emlyn Jones, Nugzar Margvelashvili, Mathieu Mongin, Kadija Oubelkheir, Peter Ralph, Farhan Rizwi, Barbara Robson, Thomas Schroeder, Jennifer Skerratt, Andrew Steven, Karen Wild-Allen
Journal title: Environmental Modelling & Software
Volume: 78
Pages: 79 - 96
ISSN: 13648152

Aquatic biogeochemical models are vital tools in understanding and predicting human impacts on water clarity. In this paper, we develop a spectrally-resolved optical model that produces remote-sensing reflectance as a function of depth-resolved biogeochemical model properties such as phytoplankton biomass, suspended sediment concentrations and benthic reflectance. We compare simulated remote-sensing reflectance from a 4 km resolution coupled hydrodynamic, optical, sediment and biogeochemical model configured for the Great Barrier Reef with observed remote-sensing reflectance from the MODIS sensor at the 8 ocean colour bands. The optical model is sufficiently accurate to capture the remote-sensing reflectance that would arise from a specific biogeochemical state. Thus the mismatch between simulated and observed remote-sensing reflectance provides an excellent metric for model assessment of the coupled biogeochemical model. Finally, we combine simulated remote-sensing reflectance in a red/green/blue colour model to produce simulated true colour images during the passage of Tropical Cyclone Yasi in February 2011.

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