POSTER SESSION 2
10:30–12:30, Tuesday, September 15
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ABSTRACT 1308 | POSTER 238
FIELD INTERCOMPARISON OF AUTONOMOUS BGC-ARGO FLOAT AND SHIPBORNE FREE-FALL RADIOMETRIC MEASUREMENTS
Satellite ocean-color products require high-quality in situ radiometric observations for their validation. While Fiducial Reference Measurement (FRM) networks such as AERONET-OC and developing HYPERNETS provide robust observations in coastal environments, equivalent open-ocean infrastructures remain sparse. Recent developments in Biogeochemical-Argo (BGC-Argo) floats now enable autonomous hyperspectral measurements of downwelling irradiance and upwelling radiance, offering a promising pathway toward a globally distributed open-ocean validation network. However, uncertainty budgets, quality-control procedures, and platform-specific corrections need improvements.
We present the HYPEBGC2FRM campaign, the field component of the ARGONET-OC project, designed to evaluate the readiness of hyperspectral BGC-Argo radiometry for FRM applications. Three 5-day cruises are being conducted between March and June 2026 in the Ligurian Sea during contrasting seasonal optical regimes (spring bloom, transitional, and summer oligotrophic conditions). A BGC-Argo float carrying hyperspectral radiometers is operated and scheduled to acquire up to three profiles per day and sampled concurrently with a ship-deployed free-fall multispectral radiometer. Calibration coefficients of radiometers of the two systems are determined against the same reference before each cruise.
The resulting dataset will enable direct comparisons of surface products, such as above water irradiance and remote-sensing reflectance, between autonomous and reference systems. Particular emphasis is placed on the acquisition of a unique dataset of concurrent radiometric profiles from autonomous and ship-based platforms, preliminary comparisons between the two-observation system will be presented.
This campaign represents a critical step toward advancing the BGC-Argo array into a scalable FRM-capable network for open-ocean satellite ocean-color validation, with benefits for future global biogeochemical and ecosystem observations.
Vincenzo Vellucci, Sorbonne Université, CNRS, Institut de la Mer de Villefranche, IMEV, France, [email protected]
Lou Andrés, Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, LOV, & ACRI-ST, Sophia-Antipolis, France, [email protected]
Edouard Leymarie, Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, LOV, France, [email protected]
Antoine Poteau, Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, LOV, France, [email protected]
Wilhem Riom, Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, LOV, France, [email protected]
Céline Dimier, Sorbonne Université, CNRS, Institut de la Mer de Villefranche, IMEV, France, [email protected]
Léo Lacour, b Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, LOV, France, [email protected]
Agniezska Bialek, National Physical Laboratory, UK, [email protected], [email protected]
Julia Uitz, Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, LOV, France, [email protected]
Hervé Claustre, Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, LOV, France, [email protected]
Poster Session | 1 | 2 | 3 | 4 | Schedule at a Glance
