seanoe:105732 data@seanoe.org 2025-12-19 ISO 19115:2003/19139 1.0 Global Look-Up Table of Physiological Ratios for the Real-Time Adjustment of Chlorophyll-a Fluorescence within the OneArgo Framework 2025-10-21 2025-12-19 Sauzède Raphaëlle, Schmechtig Catherine, Renosh Pannimpullath Remanan, Uitz Julia, Claustre Hervé (2025). Global Look-Up Table of Physiological Ratios for the Real-Time Adjustment of Chlorophyll-a Fluorescence within the OneArgo Framework. SEANOE. https://doi.org/10.17882/105732 This dataset provides a global Look-Up Table (LUT) of physiological ratios for the real-time adjustment of chlorophyll-a fluorescence measured by biogeochemical Argo (BGC-Argo) profiling floats. The physiological ratios aim to account for the global variability in the relationship between fluorescence and chlorophyll-a concentration, as influenced by phytoplankton physiology. The LUT was developed using two different gap-filled observational Argo-based products (SOCA machine learning-based methodology ; Sauzède et al., 2016; Sauzède et al., 2024). The first product provides gap-filled chlorophyll-a data derived from fluorescence corrected for dark signal and non-photochemical quenching (NPQ) following Schmechtig et al. (2023), while the second product provides chlorophyll-a concentrations derived from light attenuation. The latter is based on the downward irradiance at 490 nm (ED490) derived from the SOCA-light method (Renosh et al., 2023). From this, the diffuse attenuation coefficient (KD490) is computed, which is subsequently used to estimate the chlorophyll-a concentration through the bio-optical relationships described by Morel et al. (2007). These two products, based on fluorescence and radiometry, enable the derivation of spatially varying correction factors, or physiological ratios. These ratios provide a validated grounded framework for adjusting real-time fluorescence observations from OneArgo floats into chlorophyll-a concentrations. The LUT is distributed in NetCDF format and is provided on a regular 1°×1° latitude–longitude grid covering the global ocean. Each grid cell contains the temporal mean, averaged over the water column (from the surface to 1.5 times the euphotic depth), of the physiological ratio. The file also includes metadata describing variable definitions, units, and other relevant information. Variables included: - physiological_ratio — fluorescence-to-radiometry-based chlorophyll correction factor (dimensionless) - physiological_ratio_sd — temporal standard deviation (over the twelve months) of the fluorescence-to-radiometry-based chlorophyll correction factor (dimensionless) - lat, lon — spatial coordinates (degrees north/east) - Global attributes — dataset description, reference citation, and contact information <p>The Look-Up Table (LUT) was generated using E.U. Copernicus Marine Service Products, which are derived from OneArgo data collected and made freely available by the International Argo Program and its contributing national programs (<a href="https://argo.ucsd.edu/">https://argo.ucsd.edu</a>, <a href="https://www.ocean-ops.org/">https://www.ocean-ops.org</a>). The Argo Program is a component of the Global Ocean Observing System (GOOS).</p> Sauzède Raphaëlle Sorbonne Université, CNRS, FR 3761, Institut de la Mer de Villefranche (IMEV), Villefranche sur Mer, France Schmechtig Catherine Sorbonne Université, CNRS, UAR 3455, OSU Ecce-Terra, Paris Cedex 5, France Renosh Pannimpullath Remanan Sorbonne Université, CNRS, UMR 7093, Laboratoire d’Océanographie de Villefranche (LOV), Villefranche sur Mer, France Uitz Julia Sorbonne Université, CNRS, UMR 7093, Laboratoire d’Océanographie de Villefranche (LOV), Villefranche sur Mer, France Claustre Hervé Sorbonne Université, CNRS, UMR 7093, Laboratoire d’Océanographie de Villefranche (LOV), Villefranche sur Mer, France SEANOE https://www.seanoe.org/data/00945/105732/illustration.jpg Mean global distribution of the physiological ratio for the real-time adjustment of chlorophyll-a fluorescence in OneArgo Physical oceanography HorizonEurope Euro-Argo ONE (Agreement: 101188133) Fluorescence Pigments ODATIS aggregation parameters and Essential Variable names 2025-07-29 geonetwork.thesaurus.external.theme.NVS.OD1 Physical oceanography SeaDataNet Parameter Disciplines 2025-07-29 geonetwork.thesaurus.external.parameter.NVS.P08 IR-ARGO Research Infrastructure 2025-12-09 geonetwork.thesaurus.local.theme.IR /Observational data/in-situ Type de jeux de donnée ODATIS 2025-12-09 geonetwork.thesaurus.local.theme.type_jeux_donnee CC-BY (Creative Commons - Attribution) <p>The LUT is intended for the real-time adjustment of chlorophyll-a fluorescence measurements from profiling floats within the OneArgo framework. For each float observation, the appropriate physiological ratio can be extracted according to its geographic location and applied to correct fluorescence-derived chlorophyll-a concentrations, after the correction for dark signal and non-photochemical quenching (NPQ) has been performed (<a href="https://doi.org/10.13155/35385">Schmechtig et al., 2023</a>).</p> Vertically Resolved Global Ocean Light Models Using Machine Learning 2023 MDPI AG Renosh Pannimpullath Remanan Zhang Jie Sauzède Raphaëlle Claustre Hervé 10.3390/rs15245663 A neural network‐based method for merging ocean color and Argo data to extend surface bio‐optical properties to depth: Retrieval of the particulate backscattering coefficient 2016 American Geophysical Union (AGU) Sauzède R. Claustre H. Uitz J. Jamet C. Dall'Olmo G. D'Ortenzio F. Gentili B. Poteau A. Schmechtig C. 10.1002/2015jc011408 10.1016/j.rse.2007.03.012 10.13155/35385 Global Ocean 3D Chlorophyll-a concentration, Particulate Backscattering coefficient and Particulate Organic Carbon 2020 Mercator Ocean International European Union-Copernicus Marine Service 10.48670/moi-00046 oceans -180.0 180.0 -90.0 90.0 NC, NETCDF https://www.seanoe.org/data/00945/105732/data/123064.nc WWW:DOWNLOAD-1.0-link--download Quality controlled data fluo_to_chl_physiological_ratio_LUT - 1017 KB https://doi.org/10.17882/105732 WWW:LINK-1.0-http--metadata-URL DOI of the product https://www.seanoe.org/data/00945/105732/ rel-canonical Seanoe