10:15–10:30 | ABSTRACT 1140
ENHANCING OCEAN COLOUR CLIMATE RECORDS WITH OC CCI VERSION 7
The Ocean Colour Climate Change Initiative (OC-CCI) is preparing its Version 7 product. It incorporates significant improvements to climate-quality ocean colour records through improved validation and algorithmic innovation. Central to this effort is the compilation of an expanded global in situ bio-optical dataset (v2026), increasing total observations by ~115% (from 148k to 319k), with chlorophyll-a (Chl-a) records growing by ~31%, remote-sensing reflectance (Rrs) by ~94%, and inherent optical properties (IOPs) increasing by ~80% up to ~10,000%. Bidirectional correction of Rrs now uses the Park and Ruddick (2005) scheme (replacing Morel et al., 2002), improving consistency with satellite data and Polymer atmospheric correction. The dataset supports validation and algorithm development, with a v2026 data paper in preparation. This version integrates the latest sensors’ Level-1 reprocessing and updates system vicarious calibration (SVC) gains at MOBY, leading to performance improvements, particularly for MERIS and OLCI sensors. VIIRS-NOAA20 will be included alongside the existing six missions (SeaWiFS, MODIS-Aqua, MERIS, VIIRS-SNPP, OLCI-A, OLCI-B). The temporal inclusion of MODIS-Aqua data in the merged product is being assessed due to its recent orbital drift. As in previous versions, the OC-CCI product will include pixel-wise optical water classification using fuzzy C-means clustering, which enables dynamic selection and assignment of algorithms across distinct water regimes. In version 7, this classification will be updated, enhancing product reliability at global scale. A community round-robin involving 16 participants produced 13 algorithms for retrieving Chl-a, IOPs, and diffuse attenuation. This provides a robust benchmark for intercomparison, reproducibility, and algorithm selection in OC-CCI Version 7.
Salem Ibrahim Salem, Plymouth Marine Laboratory, [email protected], https://orcid.org/0000-0001-7707-2684
Shubha Sathyendranath, Plymouth Marine Laboratory, [email protected]
Andre Valente, AIR Centre – Atlantic International Research Centre, Parque de Ciência e Tecnologia da Ilha Terceira, [email protected]
Andrei Chuprin, Plymouth Marine Laboratory, [email protected]
Constant Mazeran, SOLVO, Antibes, [email protected]
Théo Renard, Faculty of Sciences, University of Liège, [email protected]
Jaime Pitarch, CNR – ISMAR, [email protected]
Astrid Bracher, Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Bremerhaven, [email protected]
Vittorio Brando, CNR – ISMAR, [email protected]
Vanda Brotas, MARE – Marine and Environmental Sciences Centre, Faculdade de Ciências, Universidade de Lisboa, [email protected]
Emmanuel Devred, Fisheries and Oceans Canada (DFO), [email protected]
Robert Frouin, Scripps Institution of Oceanography, University of California San Diego, [email protected]
Hiroto Higa, Faculty of Urban Innovation, Yokohama National University, [email protected]
Joji Ishizaka, Institute for Space-Earth Environmental Research, Nagoya University, [email protected]
Piotr Kowalczuk, Institute of Oceanology, Polish Academy of Sciences (IOPAN), [email protected]
Atsushi Matsuoka, Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, [email protected]
Carlos Mendes, Institute of Oceanography, Federal University of Rio Grande (FURG), [email protected]
Heeyoon Park, National Ocean Satellite Center, Korea Hydrographic & Oceanographic Agency
Valeria Segura, Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), [email protected]
Emanuele Organelli, CNR ISMAR, [email protected]
Steve Groom, Plymouth Marine Laboratory, [email protected]
