Articles | Volume 15, issue 1
https://doi.org/10.5194/essd-15-295-2023
© Author(s) 2023. 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-15-295-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Data description paper
| 
17 Jan 2023
Data description paper |
| 17 Jan 2023
| 17 Jan 2023
Improved global sea surface height and current maps from remote sensing and in situ observations
Maxime Ballarotta
CORRESPONDING AUTHOR
Collecte Localisation Satellites, 31520 Ramonville-Saint-Agne, France
Clément Ubelmann
Datlas, 38400 Saint Martin d'Hères, France
Pierre Veillard
Collecte Localisation Satellites, 31520 Ramonville-Saint-Agne, France
Pierre Prandi
Collecte Localisation Satellites, 31520 Ramonville-Saint-Agne, France
Hélène Etienne
Collecte Localisation Satellites, 31520 Ramonville-Saint-Agne, France
Sandrine Mulet
Collecte Localisation Satellites, 31520 Ramonville-Saint-Agne, France
Yannice Faugère
Collecte Localisation Satellites, 31520 Ramonville-Saint-Agne, France
Gérald Dibarboure
Centre National d'Études Spatiales, 31400 Toulouse, France
Rosemary Morrow
Centre de Topographie des Océans et de l'Hydrosphère,
Laboratoire d'Etudes en Géophysique et Océanographie Spatiale, CNRS,
CNES, IRD, Université Toulouse III, Toulouse, France
Nicolas Picot
Centre National d'Études Spatiales, 31400 Toulouse, France
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Using high-resolution satellite measurements, we observed how eddies off the Amazon shelf modify internal solitary waves. The results show that these waves can be deflected from their path, even split into two branches, and change their geometry when interacting with different types of eddies. This work provides new insight into the ocean’s complex dynamic interactions and could help guide future predictions of ocean behavior and its effects on coastal and marine ecosystems.
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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.
Florian Le Guillou, Lucile Gaultier, Maxime Ballarotta, Sammy Metref, Clément Ubelmann, Emmanuel Cosme, and Marie-Helène Rio
Ocean Sci., 19, 1517–1527, https://doi.org/10.5194/os-19-1517-2023, https://doi.org/10.5194/os-19-1517-2023, 2023
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Altimetry provides sea surface height (SSH) data along one-dimensional tracks. For many applications, the tracks are interpolated in space and time to provide gridded SSH maps. The operational SSH gridded products filter out the small-scale signals measured on the tracks. This paper evaluates the performances of a recently implemented dynamical method to retrieve the small-scale signals from real SSH data. We show a net improvement in the quality of SSH maps when compared to independent data.
Clément Ubelmann, Loren Carrere, Chloé Durand, Gérald Dibarboure, Yannice Faugère, Maxime Ballarotta, Frédéric Briol, and Florent Lyard
Ocean Sci., 18, 469–481, https://doi.org/10.5194/os-18-469-2022, https://doi.org/10.5194/os-18-469-2022, 2022
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The signature of internal tides has become an important component for high-resolution altimetry over oceans. Several studies have proposed some solutions to resolve part of these internal tides based on the altimetry record. Following these studies, we propose here a new inversion approach aimed to mitigate aliasing with other dynamics. After a description of the methodology, the solution for the main tidal components has been successfully validated against independent observations.
Solène Jousset, Sandrine Mulet, Eric Greiner, John Wilkin, Lien Vidar, Léon Chafik, Roshin Raj, Antonio Bonaduce, Nicolas Picot, and Gérald Dibarboure
Earth Syst. Sci. Data Discuss., https://doi.org/10.5194/essd-2025-429, https://doi.org/10.5194/essd-2025-429, 2025
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Satellite altimetry has revolutionized ocean observation, making it possible to track sea level with very good spatio-temporal coverage. However, only sea level anomalies are retrieved; to monitor the entire ocean signal, mean dynamic topography (MDT) must be added to these anomalies. In this study, an evaluation of new NES-CLS22 MDT shows significant improvements in the Arctic. Over the globe, this new solution is better than its predecessor, although the two solutions remain close.
Chloé Goret, Ariane Koch-Larrouy, Fabius Kouogang, Carina Regina de Macedo, Amine M’Hamdi, Jorge Magalhães, José Carlos Bastos da Silva, Michel Tchilibou, Camila Artana, Isabelle Dadou, Antoine Delepoulle, Simon Barbot, Maxime Ballarotta, Loren Carrère, and Alex Costa da Silva
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Jean H. M. Roger, Yannice Faugère, Hélène Hébert, Antoine Delepoulle, and Gérald Dibarboure
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Deployed in 2022, SWOT satellite was flying over the southwest Pacific region on 19 May 2023 when it recorded the tsunami triggered by a Mw 7.7 earthquake in the Vanuatu Subduction Zone. For the first time ever it provided a 2D image of a tsunami wavefield on a straight SSW-NNE path. Further compared with tsunami numerical simulation outputs, the modelled wavefield and SWOT record show an overall good phase agreement, but simulated amplitudes and energy spectra are lower than the measurements.
Michel Tchilibou, Simon Barbot, Loren Carrere, Ariane Koch-Larrouy, Gérald Dibarboure, and Clément Ubelmann
Ocean Sci., 21, 1469–1486, https://doi.org/10.5194/os-21-1469-2025, https://doi.org/10.5194/os-21-1469-2025, 2025
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MIOST24 (Multivariate Inversion of Ocean Surface Topography 2024) annual and monthly internal tide (IT) atlases, based on 25 years of altimetry data and an updated wavelength database, are presented for the Indo-Philippine archipelago and the Amazon shelf. The atlases show monthly IT variability and a better correction of IT in altimetry data than with MIOST22 (MIOST 2022) and HRET (High-Resolution Empirical Tide). The results support the development of a global MIOST24.
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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.
Hélène Etienne, Clément Ubelmann, Fabrice Ardhuin, and Gérald Dibarboure
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Clément Ubelmann, J. Thomas Farrar, Bertrand Chapron, Lucile Gaultier, Laura Gómez-Navarro, Marie-Hélène Rio, and Gérald Dibarboure
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Ocean Sci., 21, 343–358, https://doi.org/10.5194/os-21-343-2025, https://doi.org/10.5194/os-21-343-2025, 2025
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This study proposes a novel cross-validation method to assess the instrumental stability in sea level trends. The method involves implementing a second tandem flight phase between two successive altimeter missions a few years after the first phase. The trend in systematic instrumental differences made during the two tandem phases can be estimated below ± 0.1 mm yr-1 (16–84 % confidence level) on a global scale for time intervals between the tandem phases of 4 years or more.
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Ocean Sci., 21, 325–342, https://doi.org/10.5194/os-21-325-2025, https://doi.org/10.5194/os-21-325-2025, 2025
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Sea level observations along the swaths of the new SWOT (Surface Water and Ocean Topography) mission were used to characterize internal tides at three semidiurnal frequencies off the Amazon shelf in the tropical Atlantic during the SWOT calibration/validation period. The atlases were derived using harmonic analysis and principal component analysis. The SWOT-derived internal tide atlas outperforms the reference atlas previously used to correct SWOT observations.
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.
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.
Alice Laloue, Malek Ghantous, Yannice Faugère, Alice Dalphinet, and Lotfi Aouf
State Planet, 4-osr8, 6, https://doi.org/10.5194/sp-4-osr8-6-2024, https://doi.org/10.5194/sp-4-osr8-6-2024, 2024
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Satellite altimetry shows that daily mean significant wave heights (SWHs) and extreme SWHs have increased in the Southern Ocean, the South Atlantic, and the southern Indian Ocean over the last 2 decades. In winter in the North Atlantic, SWH has increased north of 45°N and decreased south of 45°N. SWHs likely to be exceeded every 100 years have also increased in the North Atlantic and the eastern tropical Pacific. However, this study also revealed the need for longer and more consistent series.
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
Florian Le Guillou, Lucile Gaultier, Maxime Ballarotta, Sammy Metref, Clément Ubelmann, Emmanuel Cosme, and Marie-Helène Rio
Ocean Sci., 19, 1517–1527, https://doi.org/10.5194/os-19-1517-2023, https://doi.org/10.5194/os-19-1517-2023, 2023
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Short summary
Altimetry provides sea surface height (SSH) data along one-dimensional tracks. For many applications, the tracks are interpolated in space and time to provide gridded SSH maps. The operational SSH gridded products filter out the small-scale signals measured on the tracks. This paper evaluates the performances of a recently implemented dynamical method to retrieve the small-scale signals from real SSH data. We show a net improvement in the quality of SSH maps when compared to independent data.
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.
Michel Tchilibou, Ariane Koch-Larrouy, Simon Barbot, Florent Lyard, Yves Morel, Julien Jouanno, and Rosemary Morrow
Ocean Sci., 18, 1591–1618, https://doi.org/10.5194/os-18-1591-2022, https://doi.org/10.5194/os-18-1591-2022, 2022
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This high-resolution model-based study investigates the variability in the generation, propagation, and sea height signature (SSH) of the internal tide off the Amazon shelf during two contrasted seasons. ITs propagate further north during the season characterized by weak currents and mesoscale eddies and a shallow and strong pycnocline. IT imprints on SSH dominate those of the geostrophic motion for horizontal scales below 200 km; moreover, the SSH is mainly incoherent below 70 km.
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.
Mounir Benkiran, Pierre-Yves Le Traon, and Gérald Dibarboure
Ocean Sci., 18, 609–625, https://doi.org/10.5194/os-18-609-2022, https://doi.org/10.5194/os-18-609-2022, 2022
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The SSH analysis and 7 d forecast error will be globally reduced by almost 50 %. Surface current forecast errors should be equivalent to today’s surface current analysis errors or alternatively will be improved (variance error reduction) by 30 % at the surface and 50 % for 300 m depth.
The resolution capabilities will be drastically improved and will be closer to 100 km wavelength as opposed to today where they are above 250 km (on average).
Clément Ubelmann, Loren Carrere, Chloé Durand, Gérald Dibarboure, Yannice Faugère, Maxime Ballarotta, Frédéric Briol, and Florent Lyard
Ocean Sci., 18, 469–481, https://doi.org/10.5194/os-18-469-2022, https://doi.org/10.5194/os-18-469-2022, 2022
Short summary
Short summary
The signature of internal tides has become an important component for high-resolution altimetry over oceans. Several studies have proposed some solutions to resolve part of these internal tides based on the altimetry record. Following these studies, we propose here a new inversion approach aimed to mitigate aliasing with other dynamics. After a description of the methodology, the solution for the main tidal components has been successfully validated against independent observations.
Cori Pegliasco, Antoine Delepoulle, Evan Mason, Rosemary Morrow, Yannice Faugère, and Gérald Dibarboure
Earth Syst. Sci. Data, 14, 1087–1107, https://doi.org/10.5194/essd-14-1087-2022, https://doi.org/10.5194/essd-14-1087-2022, 2022
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The new global Mesoscale Eddy Trajectory Atlases (META3.1exp) provide eddy identification and trajectories from altimetry maps. These atlases comprise an improvement to and continuation of the historical META2.0 product. Changes in the detection parameters and tracking were tested by comparing the eddies from the different datasets. In particular, the eddy contours available in META3.1exp are an asset for multi-disciplinary studies.
Pierre Prandi, Jean-Christophe Poisson, Yannice Faugère, Amandine Guillot, and Gérald Dibarboure
Earth Syst. Sci. Data, 13, 5469–5482, https://doi.org/10.5194/essd-13-5469-2021, https://doi.org/10.5194/essd-13-5469-2021, 2021
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We investigate how mapping sea level in the Arctic Ocean can benefit from combining data from three satellite radar altimeters: CryoSat-2, Sentinel-3A and SARAL/AltiKa. A dedicated processing for SARAL/AltiKa provides a baseline for the cross-referencing of CryoSat-2 and Sentinel-3A before mapping. We show that by combining measurements coming from three missions, we are able to increase the resolution of gridded sea level fields in the ice-covered Arctic Ocean.
Sandrine Mulet, Marie-Hélène Rio, Hélène Etienne, Camilia Artana, Mathilde Cancet, Gérald Dibarboure, Hui Feng, Romain Husson, Nicolas Picot, Christine Provost, and P. Ted Strub
Ocean Sci., 17, 789–808, https://doi.org/10.5194/os-17-789-2021, https://doi.org/10.5194/os-17-789-2021, 2021
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Satellite altimetry has revolutionized ocean observation by allowing the sea level to be monitored with very good spatiotemporal coverage. However, only the sea level anomalies are retrieved; to monitor the whole oceanic signal a temporal mean (called mean dynamic topography, MDT) must be added to these anomalies. In this study we present the newly updated CNES-CLS18 MDT. An evaluation of this new solution shows significant improvements in both strong currents and coastal areas.
Florent H. Lyard, Damien J. Allain, Mathilde Cancet, Loren Carrère, and Nicolas Picot
Ocean Sci., 17, 615–649, https://doi.org/10.5194/os-17-615-2021, https://doi.org/10.5194/os-17-615-2021, 2021
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Since the mid-1990s, a series of FES (finite element solution) global ocean tidal atlases has been produced with the primary objective to provide altimetry missions with a tidal de-aliasing correction. We describe the underlying hydrodynamic/data assimilation design and accuracy assessments for the FES2014 release. The FES2014 atlas shows overall improved performance and has consequently been integrated in satellite altimetry and gravimetric data processing and adopted in ITRF standards.
Loren Carrere, Brian K. Arbic, Brian Dushaw, Gary Egbert, Svetlana Erofeeva, Florent Lyard, Richard D. Ray, Clément Ubelmann, Edward Zaron, Zhongxiang Zhao, Jay F. Shriver, Maarten Cornelis Buijsman, and Nicolas Picot
Ocean Sci., 17, 147–180, https://doi.org/10.5194/os-17-147-2021, https://doi.org/10.5194/os-17-147-2021, 2021
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Internal tides can have a signature of several centimeters at the ocean surface and need to be corrected from altimeter measurements. We present a detailed validation of several internal-tide models using existing satellite altimeter databases. The analysis focuses on the main diurnal and semidiurnal tidal constituents. Results show the interest of the methodology proposed, the quality of the internal-tide models tested and their positive contribution for estimating an accurate sea level.
Cited articles
Arhan, M. and Colin de Verdière, A.: Dynamics of eddy motions in the
Eastern North Atlantic, J. Phys. Oceanogr., 15, 153–170, 1985.
Auger, M., Prandi, P., and Sallée, J. B.: Southern Ocean sea level anomaly
in the sea ice-covered sector from multimission satellite observations, Sci.
Data, 9, 70, https://doi.org/10.1038/s41597-022-01166-z, 2022.
Ballarotta, M., Ubelmann, C., Pujol, M.-I., Taburet, G., Fournier, F., Legeais, J.-F., Faugère, Y., Delepoulle, A., Chelton, D., Dibarboure, G., and Picot, N.: On the resolutions of ocean altimetry maps, Ocean Sci., 15, 1091–1109, https://doi.org/10.5194/os-15-1091-2019, 2019.
Ballarotta, M., Ubelmann, C., Rogé, M., Fournier, F., Faugère, Y.,
Dibarboure, G., Morrow, R., and Picot, N: Dynamic Mapping of Along-Track
Ocean Altimetry: Performance from Real Observations, J. Atmos.
Ocean. Tech., 37, 1593–1601, https://doi.org/10.1175/JTECH-D-20-0030.1, 2020.
Ballarotta, M., Ubelmann, C., Veillard, P., Prandi, P., Etienne, H., Mulet, S., Faugère, Y., Dibarboure, G., Morrow, R., and Picot, N.: Gridded Sea Level Height and geostrophic
velocities computed with Multiscale Interpolation combining altimetry and
drifters, CNES/CLS [data set], https://doi.org/10.24400/527896/a01-2022.009, 2022.
Beauchamp, M., Fablet, R., Ubelmann, C., Ballarotta, M., and Chapron, B.:
Intercomparison of Data-Driven and Learning-Based Interpolations of
Along-Track Nadir and Wide-Swath SWOT Altimetry Observations, Remote Sens.,
12, 3806, https://doi.org/10.3390/rs12223806, 2020.
Bojinski, S., Verstraete, M., Peterson, T., Richter, C., Simmons, A., and
Zemp, M.: The Concept of Essential Climate Variables in Support of Climate
Research, Applications, and Policy, B. Am. Meteorol.
Soc., 95, 1431–1443, 2014.
Dohan, K.: Ocean Surface Current Analyses Real-time (OSCAR) Surface
Currents – Final 0.25 Degree (Version 2.0), Ver. 2.0, PO.DAAC, CA, USA [data set], https://doi.org/10.5067/OSCAR-25F20, 2021.
Drévillon, M. Lellouche, J.-M., Régnier, C., Garric, G. Bricaud, C.,
Hernandez, O., and Bourdallé-Badie, R.: Global Ocean Reanalysis Products, Copernicus Marine [data set], https://doi.org/10.48670/moi-00021, 2022.
Ducet N., Le Traon, P. Y., and Reverdin, G.: Global high-resolution mapping of
ocean circulation from the combination of T/P and ERS-1/2, J. Geophys. Res.,
105, 19477–19498, 2000.
Dufau, C., Orsztynowicz, M., Dibarboure, G., Morrow, R., and Le Traon,
P.-Y.: Mesoscale resolution capability of altimetry: present and future, J.
Geophys. Res.-Oceans, 121, 4910–4927, https://doi.org/10.1002/2015JC010904,
2016.
Etienne, H.: Quality Information document for global ocean Multi Observation
products, https://catalogue.marine.copernicus.eu/documents/QUID/CMEMS-MOB-QUID-015-004.pdf (last access: 9 January 2023),
2021a.
Etienne, H.: Global Ocean Multi Observation Products, Copernicus Marine [data set], https://doi.org/10.48670/moi-00050, 2021b.
Etienne, H., Verbrugge, N., Boone, C., Rubio, A., Solabarrieta, L.,
Corgnati, L., Mantovani, C., Reyes, E., Chifflet, M., Mader, J., and Carval,
T.: Quality Information document for global ocean-delayed mode in-situ
observations of surface (drifters and HFR) and sub-surface (vessel mounted
ADCPs) water velocity, https://catalogue.marine.copernicus.eu/documents/QUID/CMEMS-INS-QUID-013-044.pdf (last access: 9 January 2023),
2021.
Farrar, J. T.: Observations of the dispersion characteristics and meridional
sea level structure of equatorial waves in the Pacific Ocean, J. Phys.
Oceanogr., 38, 1669–1689, 2008.
Farrar, J. T.: Barotropic Rossby waves radiating from tropical instability
waves in the Pacific Ocean, J. Phys. Oceanogr., 41, 1160–1181, 2011.
Farrar, J. T. and Durland, T. S.: Wavenumber–Frequency Spectra of
Inertia–Gravity and Mixed Rossby–Gravity Waves in the Equatorial Pacific
Ocean, J. Phys. Oceanogr., 42, 1859–1881, 2012.
Farrar, J. T. and Durland, T. S.: Equatorial waves across the Pacific (and
Indian and Atlantic), 2022 Ocean Surface Topography Science Team Meeting, Venice, Italy, 31 October–4 November 2022,
https://doi.org/10.24400/527896/a03-2022.3475, 2022.
Hersbach, H., Bell, B., Berrisford, P., Biavati, G., Horányi, A.,
Muñoz Sabater, J., Nicolas, J., Peubey, C., Radu, R., Rozum, I.,
Schepers, D., Simmons, A., Soci, C., Dee, D., and Thépaut, J.-N.: ERA5 hourly
data on single levels from 1979 to present, Copernicus Climate Change
Service (C3S) Climate Data Store (CDS) [data set], https://doi.org/10.24381/cds.adbb2d47, 2018.
International Altimetry Team:
Altimetry for the future: Building on 25 years of progress
Advances in Space Research,, 68, 319–363, https://doi.org/10.1016/j.asr.2021.01.022, 2021.
Le Guillou, F., Metref, S., Cosme, E., Ubelmann, C., Ballarotta, M., Le
Sommer, J., and Verron, J.: Mapping Altimetry in the Forthcoming SWOT Era by
Back-and-Forth Nudging a One-Layer Quasigeostrophic Model, J. Atmos. Ocean.
Tech., 38, 697–710, https://doi.org/10.1175/JTECH-D-20-0104.1, 2021.
Le Traon, P.-Y. and Dibarboure, G.: Velocity Mapping Capabilities of Present
and Future Altimeter Missions: The Role of High-Frequency Signals, J.
Atmos. Ocean. Tech., 19,
2077–2088, https://doi.org/10.1175/1520-0426(2002)019<2077:VMCOPA>2.0.CO;2, 2002.
Le Traon P.-Y., Nadal, F., and Ducet, N.: An Improved Mapping Method of
Multisatellite Altimeter Data, J. Atmos. Ocean. Tech., 15, 522–534, 1998.
Le Traon P.-Y., Faugere, Y. Hernamdez, F., Dorandeu, J., Mertz, F., and Abalin, M.: Can We Merge GEOSAT Follow-On with TOPEX/Poseidon and ERS-2 for an
Improved Description of the Ocean Circulation?, J. Atmos. Oceanic Technol.,
20, 889–895, 2003.
Lumpkin, R., Grodsky, S., Rio, M.-H., Centurioni, L., Carton, J., and Lee,
D.: Removing spurious low-frequency variability in surface drifter
velocities, J. Atmos. Ocean. Tech., 30, 353–360, https://doi.org/10.1175/JTECH-D-12-00139.1, 2013.
Lumpkin, R. and Centurioni, L.: Global Drifter Program quality-controlled
6-hour interpolated data from ocean surface drifting buoys, NOAA National
Centers for Environmental Information [data set],
https://doi.org/10.25921/7ntx-z961, 2019.
Morrow, R., Fu, L. L., Ardhuin, F., Benkiran, M., Chapron, B., Cosme, E.,
d'Ovidio, F., Farrar, J. T., Gille, S. T., Lapeyre, G., Le Traon, P. Y.,
Pascual, A., Ponte, A., Qiu, B., Rascle, N., Ubelmann, C., Wang, J., and
Zaron, E. D.: Global observations of fine-scale ocean surface topography with
the Surface Water and Ocean Topography (SWOT) mission, Front. Mar. Sci., 6,
232, https://doi.org/10.3389/fmars.2019.00232, 2019.
Lellouche, J.-M., Greiner, E., Le Galloudec, O., Garric, G., Regnier, C., Drevillon, M., Benkiran, M., Testut, C.-E., Bourdalle-Badie, R., Gasparin, F., Hernandez, O., Levier, B., Drillet, Y., Remy, E., and Le Traon, P.-Y.: Recent updates to the Copernicus Marine Service global ocean monitoring and forecasting real-time
Matsuno, T.: Quasi-geostrophic motions in the equatorial area, J. Meteor.
Soc. Japan, 44, 25–43, 1966.
Mulet, S., Etienne, H., Ballarotta, M., Faugere, Y., Rio, M. H., Dibarboure,
G., and Picot, N.: Synergy between surface drifters and altimetry to increase
the accuracy of sea level anomaly and geostrophic current maps in the Gulf
of Mexico, Advances in Space Research, 68, 420–431,
https://doi.org/10.1016/j.asr.2019.12.024, 2021a.
Mulet, S., Rio, M.-H., Etienne, H., Artana, C., Cancet, M., Dibarboure, G., Feng, H., Husson, R., Picot, N., Provost, C., and Strub, P. T.: The new CNES-CLS18 global mean dynamic topography, Ocean Sci., 17, 789–808, https://doi.org/10.5194/os-17-789-2021, 2021b.
Prandi, P., Poisson, J.-C., Faugère, Y., Guillot, A., and Dibarboure, G.: Arctic sea surface height maps from multi-altimeter combination, Earth Syst. Sci. Data, 13, 5469–5482, https://doi.org/10.5194/essd-13-5469-2021, 2021.
Pujol, M.-I., Faugère, Y., Taburet, G., Dupuy, S., Pelloquin, C., Ablain, M., and Picot, N.: DUACS DT2014: the new multi-mission altimeter data set reprocessed over 20 years, Ocean Sci., 12, 1067–1090, https://doi.org/10.5194/os-12-1067-2016, 2016.
Pujol, M.-I., Taburet, G., and SL-TAC team: Sea Level TAC – DUACS products, Copernicus Marine [data set], https://doi.org/10.48670/moi-00146, 2022a.
Pujol, M.-I., Taburet, G., and SL-TAC team: Sea Level TAC – DUACS products, Copernicus Marine [data set], https://doi.org/10.48670/moi-00148, 2022b.
Rio, M.-H.: Use of altimeter and wind data to detect the anomalous loss of
SVP-type drifter's drogue, J. Atmos. Ocean. Tech., 29, 1663–1674,
https://doi.org/10.1175/JTECH-D-12-00008.1, 2012.
Rio, M.-H., Mulet, S., and Picot, N.: Beyond GOCE for the ocean circulation
estimate: Synergetic use of altimetry, gravimetry, and in situ data provides
new insight into geostrophic and Ekman currents, Geophys. Res. Lett., 41, 8918–8925,
https://doi.org/10.1002/2014GL061773, 2014.
Shinoda, T., Kiladis, G. N., and Roundy, P. E.: Statistical representation of
equatorial waves and tropical instability waves in the Pacific Ocean, Atmos.
Res., 94, 37–44, 2009.
Taburet, G., Pujol, M.-I., and the SL-TAC Team: Quality information document, Sea
Level TAC – DUACS Products, Copernicus Marine Service, https://catalogue.marine.copernicus.eu/documents/QUID/CMEMS-SL-QUID-008-032-068.pdf (last access: 9 January 2022),
2021.
Tanaka, Y. and Hibiya, T.: Generation Mechanism of Tropical Instability
Waves in the Equatorial Pacific Ocean, J. Phys. Oceanogr.,
49, 2901–2915, 2019.
Ubelmann, C., Klein, P., and Fu, L.-L.: Dynamic interpolation of sea surface
height and potential applications for future high-resolution altimetry
mapping, J. Atmos. Ocean. Tech., 32, 177–184, https://doi.org/10.1175/JTECH-D-14-00152.1, 2015.
Ubelmann, C., Dibarboure, G., Gaultier, L., Ponte, A., Ardhuin, F.,
Ballarotta, M., and Faugère, Y.: Reconstructing ocean surface current
combining altimetry and future spaceborne Doppler data, J.
Geophys. Res.-Oceans, 126, e2020JC016560,
https://doi.org/10.1029/2020JC016560, 2021.
Ubelmann, C., Carrere, L., Durand, C., Dibarboure, G., Faugère, Y., Ballarotta, M., Briol, F., and Lyard, F.: Simultaneous estimation of ocean mesoscale and coherent internal tide sea surface height signatures from the global altimetry record, Ocean Sci., 18, 469–481, https://doi.org/10.5194/os-18-469-2022, 2022.
Short summary
We present a new gridded sea surface height and current dataset produced by combining observations from nadir altimeters and drifting buoys. This product is based on a multiscale and multivariate mapping approach that offers the possibility to improve the physical content of gridded products by combining the data from various platforms and resolving a broader spectrum of ocean surface dynamic than in the current operational mapping system. A quality assessment of this new product is presented.
We present a new gridded sea surface height and current dataset produced by combining...
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