Articles | Volume 18, issue 3
https://doi.org/10.5194/essd-18-2319-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-18-2319-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Data description article
| 
30 Mar 2026
Data description article |
| 30 Mar 2026
| 30 Mar 2026
ALTICAP: a new global satellite altimetry product for coastal applications
Mathilde Cancet
CORRESPONDING AUTHOR
LEGOS, University of Toulouse, IRD, CNES, CNRS, UPS, 31400 Toulouse, France
Florence Birol
LEGOS, University of Toulouse, IRD, CNES, CNRS, UPS, 31400 Toulouse, France
Oscar Vergara
Collecte Localisation Satellites (CLS), 31520 Ramonville-Saint-Agne, France
Quentin Dagneaux
Collecte Localisation Satellites (CLS), 31520 Ramonville-Saint-Agne, France
CELAD, 31130 Balma, France
Fabien Léger
LEGOS, University of Toulouse, IRD, CNES, CNRS, UPS, 31400 Toulouse, France
François Bignalet-Cazalet
CNES, 31400 Toulouse, France
Jean-Alexis Daguze
Collecte Localisation Satellites (CLS), 31520 Ramonville-Saint-Agne, France
Ergane Fouchet
Noveltis, 31670 Labège, France
Mercator Ocean International, 31400 Toulouse, France
Alexandre Homerin
Noveltis, 31670 Labège, France
Claire Maraldi
CNES, 31400 Toulouse, France
Fernando Niño
LEGOS, University of Toulouse, IRD, CNES, CNRS, UPS, 31400 Toulouse, France
Marie-Isabelle Pujol
Collecte Localisation Satellites (CLS), 31520 Ramonville-Saint-Agne, France
Ngan Tran
Collecte Localisation Satellites (CLS), 31520 Ramonville-Saint-Agne, France
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Juliette Gamot, Antoine Delepoulle, Francesco Nencioli, Marie-Isabelle Pujol, and Gérald Dibarboure
Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2026-108, https://doi.org/10.5194/essd-2026-108, 2026
Preprint under review for ESSD
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Mesoscale eddies are rotating ocean features that play a key role in transporting heat, salt, and biological material. This study presents a new global dataset derived from satellite observations to track these eddies and identify when they merge or split. By organizing them into interaction networks, we show that such events are frequent and strongly influence eddy evolution, leading to a more realistic description of ocean circulation.
Michael G. Hart-Davis, Roman L. Sulzbach, Stefan A. Talke, Ivan D. Haigh, Marta Marcos, Philip Woodworth, Richard Ray, Ole B. Andersen, Florent Lyard, Ergane Fouchet, Denise Dettmering, Maik Thomas, and Florian Seitz
EGUsphere, https://doi.org/10.5194/egusphere-2026-346, https://doi.org/10.5194/egusphere-2026-346, 2026
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Ocean tides are a critical component of the global climate system, influencing a wide range of geophysical processes. Tide gauges have been a valuable source to develop the theory of ocean tides and understand their variability. We present updated tidal characteristics from the GESLA-4 global tide gauge dataset. We provide updated and new statistics on tidal properties, intended to be useful to a range of communities, from navigation and fishing communities to ocean scientists and tidal experts.
Cécile Kocha, Marine Liévin, Yann Pageot, Clémence Rubin, Victor Quet, Franck Octau, Marie-Isabelle Pujol, Pierre Prandi, Sabine Philipps, Gerald Dibarboure, Isabelino Denis, Carolina Nogueira Loddo, and François Bignalet-Cazalet
Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2025-604, https://doi.org/10.5194/essd-2025-604, 2026
Preprint under review for ESSD
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30 years of satellite altimetry data were reprocessed in 2024, using state-of-the-art research algorithms and models. The so-called DT-2024 sea level dataset provides a homogenous and consistent set of observations from 15 satellites and 5 climate reference altimeters. This new dataset is shown to improve mesoscale quality and consistency, particularly over coastal and polar areas, as well as the long-term stability for climate research.
Laura Gómez-Navarro, Maxime Ballarotta, Diego Cortés-Morales, Marie-Isabelle Pujol, Laura Fortunato, Baptiste Mourre, and Ananda Pascual
State Planet Discuss., https://doi.org/10.5194/sp-2025-17, https://doi.org/10.5194/sp-2025-17, 2025
Preprint under review for SP
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Understanding how the ocean moves heat, nutrients, and pollution is vital for climate studies and ecosystem health. We examined eddies in the western Mediterranean Sea using innovative satellite observations from the Surface Water and Ocean Topography mission. Compared to existing data, we detected major differences in eddy patterns. These advances improve our ability to monitor the ocean, manage marine pollution, and support sustainable maritime activities.
Maya Raghunath Suryawanshi, Malcolm McMillan, Jennifer Maddalena, Fanny Piras, Jérémie Aublanc, Jean-Alexis Daguzé, Clara Grau, and Qi Huang
The Cryosphere, 19, 2855–2880, https://doi.org/10.5194/tc-19-2855-2025, https://doi.org/10.5194/tc-19-2855-2025, 2025
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Increasing melting rates of the polar ice sheets are contributing more and more to sea level rise. Due to the remoteness and expanse of ice sheets, these changes are mainly observed using satellites. However, the accuracy of these measurements depends on the processing of these datasets. Here we use advanced algorithms to provide improved historical ice sheet elevation measurements, derived from satellite altimeters flying between 1991 and 2012, which will benefit cryospheric applications.
Pierre-Yves Le Traon, Gérald Dibarboure, Jean-Michel Lellouche, Marie-Isabelle Pujol, Mounir Benkiran, Marie Drevillon, Yann Drillet, Yannice Faugère, and Elisabeth Remy
Ocean Sci., 21, 1329–1347, https://doi.org/10.5194/os-21-1329-2025, https://doi.org/10.5194/os-21-1329-2025, 2025
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By providing all weather, global, and real-time observations of sea level, a key variable to constrain ocean analysis and forecasting systems, satellite altimetry has had a profound impact on the development of operational oceanography. This paper provides an overview of the development and evolution of satellite altimetry and operational oceanography over the past 20 years from the launch of Jason-1 in 2001 to the launch of SWOT (Surface Water and Ocean Topography) in 2022.
Gerald Dibarboure, Cécile Anadon, Frédéric Briol, Emeline Cadier, Robin Chevrier, Antoine Delepoulle, Yannice Faugère, Alice Laloue, Rosemary Morrow, Nicolas Picot, Pierre Prandi, Marie-Isabelle Pujol, Matthias Raynal, Anaelle Tréboutte, and Clément Ubelmann
Ocean Sci., 21, 283–323, https://doi.org/10.5194/os-21-283-2025, https://doi.org/10.5194/os-21-283-2025, 2025
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The Surface Water and Ocean Topography (SWOT) mission delivers unprecedented swath-altimetry products. In this paper, we describe how we extended the Level-3 algorithms to handle SWOT’s unique swath-altimeter data. We also illustrate and discuss the benefits, relevance, and limitations of Level-3 swath-altimeter products for various research domains.
Florence Birol, François Bignalet-Cazalet, Mathilde Cancet, Jean-Alexis Daguze, Wassim Fkaier, Ergane Fouchet, Fabien Léger, Claire Maraldi, Fernando Niño, Marie-Isabelle Pujol, and Ngan Tran
Ocean Sci., 21, 133–150, https://doi.org/10.5194/os-21-133-2025, https://doi.org/10.5194/os-21-133-2025, 2025
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We take advantage of the availability of several algorithms for most of the terms/corrections used to calculate altimetry sea level data to quantify and analyze the sources of uncertainty associated with the approach to the coast. The results highlight their hierarchy. Tidal corrections and mean sea surface height contribute to coastal sea level data uncertainties. Improving the retracking algorithm is today the main factor to bring accurate altimetry sea level data closer to the shore.
Maxime Ballarotta, Clément Ubelmann, Valentin Bellemin-Laponnaz, Florian Le Guillou, Guillaume Meda, Cécile Anadon, Alice Laloue, Antoine Delepoulle, Yannice Faugère, Marie-Isabelle Pujol, Ronan Fablet, and Gérald Dibarboure
Ocean Sci., 21, 63–80, https://doi.org/10.5194/os-21-63-2025, https://doi.org/10.5194/os-21-63-2025, 2025
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The Surface Water and Ocean Topography (SWOT) mission provides unprecedented swath altimetry data. This study examines SWOT's impact on mapping systems, showing a moderate effect with the current nadir altimetry constellation and a stronger impact with a reduced one. Integrating SWOT with dynamic mapping techniques improves the resolution of satellite-derived products, offering promising solutions for studying and monitoring sea-level variability at finer scales.
Antonio Sánchez-Román, Flora Gues, Romain Bourdalle-Badie, Marie-Isabelle Pujol, Ananda Pascual, and Marie Drévillon
State Planet, 4-osr8, 4, https://doi.org/10.5194/sp-4-osr8-4-2024, https://doi.org/10.5194/sp-4-osr8-4-2024, 2024
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This study investigates the changing pattern of the Gulf Stream over the last 3 decades as observed in the altimetric record (1993–2022). Changes in the Gulf Stream path have an effect on its speed (and associated energy) and also on waters transported towards the subpolar North Atlantic, impacting Europe's climate. The observed shifts in the paths seem to be linked to variability in the North Atlantic Ocean during winter that may play an important role.
Karina von Schuckmann, Lorena Moreira, Mathilde Cancet, Flora Gues, Emmanuelle Autret, Jonathan Baker, Clément Bricaud, Romain Bourdalle-Badie, Lluis Castrillo, Lijing Cheng, Frederic Chevallier, Daniele Ciani, Alvaro de Pascual-Collar, Vincenzo De Toma, Marie Drevillon, Claudia Fanelli, Gilles Garric, Marion Gehlen, Rianne Giesen, Kevin Hodges, Doroteaciro Iovino, Simon Jandt-Scheelke, Eric Jansen, Melanie Juza, Ioanna Karagali, Thomas Lavergne, Simona Masina, Ronan McAdam, Audrey Minière, Helen Morrison, Tabea Rebekka Panteleit, Andrea Pisano, Marie-Isabelle Pujol, Ad Stoffelen, Sulian Thual, Simon Van Gennip, Pierre Veillard, Chunxue Yang, and Hao Zuo
State Planet, 4-osr8, 1, https://doi.org/10.5194/sp-4-osr8-1-2024, https://doi.org/10.5194/sp-4-osr8-1-2024, 2024
Karina von Schuckmann, Lorena Moreira, Mathilde Cancet, Flora Gues, Emmanuelle Autret, Ali Aydogdu, Lluis Castrillo, Daniele Ciani, Andrea Cipollone, Emanuela Clementi, Gianpiero Cossarini, Alvaro de Pascual-Collar, Vincenzo De Toma, Marion Gehlen, Rianne Giesen, Marie Drevillon, Claudia Fanelli, Kevin Hodges, Simon Jandt-Scheelke, Eric Jansen, Melanie Juza, Ioanna Karagali, Priidik Lagemaa, Vidar Lien, Leonardo Lima, Vladyslav Lyubartsev, Ilja Maljutenko, Simona Masina, Ronan McAdam, Pietro Miraglio, Helen Morrison, Tabea Rebekka Panteleit, Andrea Pisano, Marie-Isabelle Pujol, Urmas Raudsepp, Roshin Raj, Ad Stoffelen, Simon Van Gennip, Pierre Veillard, and Chunxue Yang
State Planet, 4-osr8, 2, https://doi.org/10.5194/sp-4-osr8-2-2024, https://doi.org/10.5194/sp-4-osr8-2-2024, 2024
Elisa Carli, Rosemary Morrow, Oscar Vergara, Robin Chevrier, and Lionel Renault
Ocean Sci., 19, 1413–1435, https://doi.org/10.5194/os-19-1413-2023, https://doi.org/10.5194/os-19-1413-2023, 2023
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Oceanic eddies are the structures carrying most of the energy in our oceans. They are key to climate regulation and nutrient transport. We prepare for the Surface Water and Ocean Topography mission, studying eddy dynamics in the region south of Africa, where the Indian and Atlantic oceans meet, using models and simulated satellite data. SWOT will provide insights into the structures smaller than what is currently observable, which appear to greatly contribute to eddy kinetic energy and strain.
Antonio Sánchez-Román, M. Isabelle Pujol, Yannice Faugère, and Ananda Pascual
Ocean Sci., 19, 793–809, https://doi.org/10.5194/os-19-793-2023, https://doi.org/10.5194/os-19-793-2023, 2023
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This paper assesses the performance of the latest version (DT2021) of global gridded altimetry products distributed through the CMEMS and C3S Copernicus programs on the retrieval of sea level in the coastal zone of the European seas with respect to the previous DT2018 version. This comparison is made using an external independent dataset. DT2021 sea level products better solve the signal in the coastal band.
Adrien Guérou, Benoit Meyssignac, Pierre Prandi, Michaël Ablain, Aurélien Ribes, and François Bignalet-Cazalet
Ocean Sci., 19, 431–451, https://doi.org/10.5194/os-19-431-2023, https://doi.org/10.5194/os-19-431-2023, 2023
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Based on the latest satellite observations published by the French space agency CNES, we present the current state of the sea level at the scale of the planet and assess its rise and acceleration over the past 29 years. To support scientific research we provide updated estimations of our confidence in our estimations and highlight key technological and scientific fields. Making progress on that will help to better characterize the sea level in the future.
Oscar Vergara, Rosemary Morrow, Marie-Isabelle Pujol, Gérald Dibarboure, and Clément Ubelmann
Ocean Sci., 19, 363–379, https://doi.org/10.5194/os-19-363-2023, https://doi.org/10.5194/os-19-363-2023, 2023
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Recent advances allow us to observe the ocean from space with increasingly higher detail, challenging our knowledge of the ocean's surface height signature. We use a statistical approach to determine the spatial scale at which the sea surface height signal is no longer dominated by geostrophic turbulence but in turn becomes dominated by wave-type motions. This information helps us to better use the data provided by ocean-observing satellites and to gain knowledge on climate-driving processes.
Marie-Isabelle Pujol, Stéphanie Dupuy, Oscar Vergara, Antonio Sánchez-Román, Yannice Faugère, Pierre Prandi, Mei-Ling Dabat, Quentin Dagneaux, Marine Lievin, Emeline Cadier, Gérald Dibarboure, and Nicolas Picot
Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2022-292, https://doi.org/10.5194/essd-2022-292, 2022
Manuscript not accepted for further review
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An altimeter sea level along-track level-3 product with a 5 Hz (~1.2 km) sampling is proposed. It takes advantage of recent advances in radar altimeter processing, and improvements made to different stages of the processing chain. Compared to the conventional 1 Hz (~7 km) product, it significantly improves the observability of the short wavelength signal in open ocean and near coast areas (> 5 km). It also contributes to improving high resolution numerical model outputs via data assimilation.
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Short summary
Observing sea level variations at high resolution is paramount for coastal scientific, societal and economic issues. ALTICAP (ALTimetry Innovative Coastal Approach Product) is a new product of Sea Level Anomaly derived from Jason-3 20 Hz along track satellite altimetry and benefiting from the most recent corrections. It covers all coastal ocean up to 500 km from land, from February 2016 to July 2021. It also provides collocated altimetric significant wave height and wind speed.
Observing sea level variations at high resolution is paramount for coastal scientific, societal...
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