POSTER SESSION 1
15:30–17:30, Monday, September 14
Poster Session | 1 | 2 | 3 | 4 | Schedule at a Glance
ABSTRACT 1260 | POSTER 5
HYPERSPECTRAL RADIOMETRY IN THE OPEN OCEAN: BGC-ARGO FLOATS SUPPORTING SATELLITE VALIDATION
The BioGeoChemical-Argo (BGC-Argo) program is progressively building a global network of autonomous profiling floats equipped with biogeochemical and bio-optical sensors. Since 2012, floats have measured downwelling irradiance (Ed) at three wavelengths (380, 412, and 490 nm). Since 2022, within the ERC-REFINE project, a subset of ~21 floats has been equipped with ruggedized hyperspectral TriOS-RAMSES radiometers, enabling measurements of both Ed and upwelling radiance (Lu) from 300 m to the surface. These floats operate across diverse open-ocean regions and currently provide near-real-time profiles every 10 days, with nearly 1200 hyperspectral profiles acquired to date.
This study evaluates the potential of BGC-Argo floats to meet the requirements of Fiducial Reference Measurements (FRM) for ocean color satellite validation. In particular, we present a processing framework to derive hyperspectral remote sensing reflectance (Rrs) from raw measurements. Each Rrs spectrum is quality-controlled using a method specifically developed for hyperspectral BGC-Argo profiles, and is associated with an uncertainty estimated through Monte Carlo propagation based on a comprehensive uncertainty budget. This budget relies on the characterization of adapted TriOS-RAMSES radiometers, as well as on the quantification of the main platform-specific sources of uncertainty.
Finally, we present results from comparisons between quality-controlled in situ Rrs spectra and ocean color satellite observations. These results demonstrate that the development of a BGC-Argo fleet dedicated to operational validation is technically feasible. Such an approach represents a natural evolution of the ocean color validation framework, providing a system consistent with the spatial coverage and spectral resolution of current and future satellite missions.
Lou Andres*, Laboratoire d’Océanographie de Villefranche-sur-Mer (LOV) / ACRI-ST, [email protected], https://orcid.org/0009-0006-4494-6350
Vincenzo Vellucci, Sorbonne Université, CNRS, Institut de la Mer de Villefranche, IMEV, France, [email protected]
Emanuele Organelli, National Research Council of Italy (CNR), Institute of Marine Science (ISMAR), Rome, Italy, [email protected]
Agnieszka Bialek, National Physical Laboratory, NPL, Teddington, United Kingdom, [email protected]
Edouard Leymarie, Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, France, [email protected]
Nils Haëntjens, University of Maine, School of Marine Sciences, United States, [email protected]
Marine Bretagnon, ACRI-ST, France, [email protected]
Antoine Poteau, Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, France, [email protected]
Antoine Mangin, ACRI-ST, Sophia-Antipolis, France, [email protected]
Charlotte Begouen Demeaux, University of Maine, School of Marine Sciences, United States, [email protected]
Hervé Claustre, Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, France, [email protected]
Poster Session | 1 | 2 | 3 | 4 | Schedule at a Glance
