A semianalytical ocean color inversion algorithm with explicit water column depth and substrate reflectance parameterization

Mckinna, Lachlan I. W, Fearns, Peter R.C, Weeks, Scarla J, Werdell, P. Jeremy, Reichstetter, Martina, Franz, Bryan A, Shea, Donald M and Feldman, Gene C (2015) A semianalytical ocean color inversion algorithm with explicit water column depth and substrate reflectance parameterization. Journal of Geophysical Research: Oceans, 120 3: 1741-1770. doi:10.1002/2014JC010224

Author Mckinna, Lachlan I. W
Fearns, Peter R.C
Weeks, Scarla J
Werdell, P. Jeremy
Reichstetter, Martina
Franz, Bryan A
Shea, Donald M
Feldman, Gene C
Title A semianalytical ocean color inversion algorithm with explicit water column depth and substrate reflectance parameterization
Journal name Journal of Geophysical Research: Oceans   Check publisher's open access policy
ISSN 2169-9291
Publication date 2015-03-19
Year available 2015
Sub-type Article (original research)
DOI 10.1002/2014JC010224
Open Access Status
Volume 120
Issue 3
Start page 1741
End page 1770
Total pages 30
Place of publication Hoboken, United States
Publisher Wiley-Blackwell Publishing, Inc
Collection year 2016
Language eng
Formatted abstract
A semianalytical ocean color inversion algorithm was developed for improving retrievals of inherent optical properties (IOPs) in optically shallow waters. In clear, geometrically shallow waters, light reflected off the seafloor can contribute to the water-leaving radiance signal. This can have a confounding effect on ocean color algorithms developed for optically deep waters, leading to an overestimation of IOPs. The algorithm described here, the Shallow Water Inversion Model (SWIM), uses pre-existing knowledge of bathymetry and benthic substrate brightness to account for optically shallow effects. SWIM was incorporated into the NASA Ocean Biology Processing Group's L2GEN code and tested in waters of the Great Barrier Reef, Australia, using the Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua time series (2002–2013). SWIM-derived values of the total non-water absorption coefficient at 443 nm, at(443), the particulate backscattering coefficient at 443 nm, bbp(443), and the diffuse attenuation coefficient at 488 nm, Kd(488), were compared with values derived using the Generalized Inherent Optical Properties algorithm (GIOP) and the Quasi-Analytical Algorithm (QAA). The results indicated that in clear, optically shallow waters SWIM-derived values of at(443), bbp(443), and Kd(443) were realistically lower than values derived using GIOP and QAA, in agreement with radiative transfer modeling. This signified that the benthic reflectance correction was performing as expected. However, in more optically complex waters, SWIM had difficulty converging to a solution, a likely consequence of internal IOP parameterizations. Whilst a comprehensive study of the SWIM algorithm's behavior was conducted, further work is needed to validate the algorithm using in situ data.
Keyword Benthic reflectance
Geometric depth
Great Barrier Reef
Inherent optical properties
Optically shallow
Remote sensing
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Geography, Planning and Environmental Management Publications
Official 2016 Collection
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