Abstract

Using in situ measurements of radiometric quantities and of the optical backscattering coefficient of particulate matter (${{{b}}_{\textit{bp}}}$) at an oceanic site, we show that diel cycles of ${{{b}}_{\textit{bp}}}$ are large enough to generate measurable diel variability of the ocean reflectance. This means that biogeochemical quantities such as net phytoplankton primary production, which are derivable from the diel ${{{b}}_{\textit{bp}}}$ signal, can be potentially derived also from the diel variability of ocean color radiometry (OCR). This is a promising avenue for basin-scale quantification of such quantities because OCR is now performed from geostationary platforms that enable quantification of diel changes in the ocean reflectance over large ocean expanses. To assess the feasibility of this inversion, we applied three numerical inversion algorithms to derive ${{{b}}_{\textit{bp}}}$ from measured reflectance data. The uncertainty in deriving ${{{b}}_{\textit{bp}}}$ transfers to the retrieval of its diel cycle, making the performance of the inversion better in the green part of the spectrum (555 nm), with correlation coefficients ${\gt}{0.75}$ and a variability of 40% between the observed and derived ${{{b}}_{\textit{bp}}}$ diel changes. While the results are encouraging, they also emphasize the inherent limitation of current inversion algorithms in deriving diel changes of ${{{b}}_{\textit{bp}}}$, which essentially stems from the empirical parameterizations that such algorithms include.

© 2022 Optica Publishing Group

Optimal estimation framework for ocean color atmospheric correction and pixel-level uncertainty quantification

Amir Ibrahim, Bryan A. Franz, Andrew M. Sayer, Kirk Knobelspiesse, Minwei Zhang, Sean W. Bailey, Lachlan I. W. McKinna, Meng Gao, and P. Jeremy Werdell
Appl. Opt. 61(22) 6453-6475 (2022)

Effect of inherent optical properties variability on the chlorophyll retrieval from ocean color remote sensing: an in situ approach

Loisel Hubert, Bertrand Lubac, David Dessailly, Lucile Duforet-Gaurier, and Vincent Vantrepotte
Opt. Express 18(20) 20949-20959 (2010)

Multivariate approach for the retrieval of phytoplankton size structure from measured light absorption spectra in the Mediterranean Sea (BOUSSOLE site)

Emanuele Organelli, Annick Bricaud, David Antoine, and Julia Uitz
Appl. Opt. 52(11) 2257-2273 (2013)

Optimizing retrieval spaces of bio-optical models for remote sensing of ocean color

Neranga K. Hannadige, Peng-Wang Zhai, P. Jeremy Werdell, Meng Gao, Bryan A. Franz, Kirk Knobelspiesse, and Amir Ibrahim
Appl. Opt. 62(13) 3299-3309 (2023)

Influence of Raman scattering on ocean color inversion models

Toby K. Westberry, Emmanuel Boss, and Zhongping Lee
Appl. Opt. 52(22) 5552-5561 (2013)