Articles | Volume 17, issue 1
Ocean Sci., 17, 147–180, 2021
https://doi.org/10.5194/os-17-147-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Special issue: Developments in the science and history of tides (OS/ACP/HGSS/NPG/SE...
Ocean Sci., 17, 147–180, 2021
https://doi.org/10.5194/os-17-147-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article 19 Jan 2021
Research article | 19 Jan 2021
Accuracy assessment of global internal-tide models using satellite altimetry
Loren Carrere et al.
Related authors
Simon Barbot, Florent Lyard, Michel Tchilibou, and Loren Carrere
Ocean Sci. Discuss., https://doi.org/10.5194/os-2021-19, https://doi.org/10.5194/os-2021-19, 2021
Preprint under review for OS
Short summary
Short summary
The internal tides are responsible for surface deformations that could affect the measurement of the forthcoming SWOT altimetric mission. The unidentified internal tides deformations by the satellite could reduce the detection of small eddies in the ocean. This study highlights the variability of the properties of internal tides deformations based on the stratification variability only. A single methodology is successfully applied on two areas driven by different oceanic processes.
Florent H. Lyard, Damien J. Allain, Mathilde Cancet, Loren Carrère, and Nicolas Picot
Ocean Sci. Discuss., https://doi.org/10.5194/os-2020-96, https://doi.org/10.5194/os-2020-96, 2020
Revised manuscript accepted for OS
Short summary
Short summary
Since the mid-1990’s, a series of FES (Finite Element Solution) global ocean tidal atlases have been produced with the primary objective to provide altimetry missions with 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 performances and has consequently been integrated in satellite altimetry and gravimetric data processing, and adopted in ITRF standards.
Graham D. Quartly, Jean-François Legeais, Michaël Ablain, Lionel Zawadzki, M. Joana Fernandes, Sergei Rudenko, Loren Carrère, Pablo Nilo García, Paolo Cipollini, Ole B. Andersen, Jean-Christophe Poisson, Sabrina Mbajon Njiche, Anny Cazenave, and Jérôme Benveniste
Earth Syst. Sci. Data, 9, 557–572, https://doi.org/10.5194/essd-9-557-2017, https://doi.org/10.5194/essd-9-557-2017, 2017
Short summary
Short summary
We have produced an improved monthly record of mean sea level for 1993–2015. It is developed by careful processing of the records from nine satellite altimeter missions, making use of the best available orbits, instrumental corrections and geophysical corrections. This paper details the selection process and the processing method. The data are suitable for investigation of sea level changes at scales from seasonal to long-term sea level rise, including interannual variations due to El Niño.
Loren Carrere, Yannice Faugère, and Michaël Ablain
Ocean Sci., 12, 825–842, https://doi.org/10.5194/os-12-825-2016, https://doi.org/10.5194/os-12-825-2016, 2016
Short summary
Short summary
New dynamic atmospheric (DAC_ERA) and dry tropospheric (DT_ERA) correction have been computed for the altimeter period using the ERA-Interim meteorological reanalysis. The corrections improve sea level estimations in Southern Ocean and in shallow waters; the impact is the most important for the first decade of altimetry, when operational meteorological models had a weaker quality. DT_ERA remains better in the recent period. New corrections significantly impact long-term regional trends.
Simon Barbot, Florent Lyard, Michel Tchilibou, and Loren Carrere
Ocean Sci. Discuss., https://doi.org/10.5194/os-2021-19, https://doi.org/10.5194/os-2021-19, 2021
Preprint under review for OS
Short summary
Short summary
The internal tides are responsible for surface deformations that could affect the measurement of the forthcoming SWOT altimetric mission. The unidentified internal tides deformations by the satellite could reduce the detection of small eddies in the ocean. This study highlights the variability of the properties of internal tides deformations based on the stratification variability only. A single methodology is successfully applied on two areas driven by different oceanic processes.
Philip L. Woodworth, J. A. Mattias Green, Richard D. Ray, and John M. Huthnance
Ocean Sci. Discuss., https://doi.org/10.5194/os-2020-121, https://doi.org/10.5194/os-2020-121, 2021
Preprint under review for OS
Short summary
Short summary
This special issue marks the 100th anniversary of the Liverpool Tidal Institute. This preface summarises how the LTI came about and the roles of its first two Directors. It also gives an overview of research on tides at the LTI. Summaries are given of the 26 papers in the special issue. The topics of many of them could be thought of as providing a continuation of the research first undertaken at the LTI. They provide a snapshot of work on tides now being made by groups around the world.
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. Discuss., https://doi.org/10.5194/os-2020-117, https://doi.org/10.5194/os-2020-117, 2021
Revised manuscript under review for OS
Short summary
Short summary
Satellite altimetry have revolutionized the ocean observation by monitoring the sea level with a very good spatio-temporal coverage. However, only the sea level anomalies are retrieved; to monitor the whole oceanic signal a temporal mean (called MDT=Mean Dynamic Topography) 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 both in strong currents and coastal areas.
Florent H. Lyard, Damien J. Allain, Mathilde Cancet, Loren Carrère, and Nicolas Picot
Ocean Sci. Discuss., https://doi.org/10.5194/os-2020-96, https://doi.org/10.5194/os-2020-96, 2020
Revised manuscript accepted for OS
Short summary
Short summary
Since the mid-1990’s, a series of FES (Finite Element Solution) global ocean tidal atlases have been produced with the primary objective to provide altimetry missions with 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 performances and has consequently been integrated in satellite altimetry and gravimetric data processing, and adopted in ITRF standards.
Michel Tchilibou, Lionel Gourdeau, Florent Lyard, Rosemary Morrow, Ariane Koch Larrouy, Damien Allain, and Bughsin Djath
Ocean Sci., 16, 615–635, https://doi.org/10.5194/os-16-615-2020, https://doi.org/10.5194/os-16-615-2020, 2020
Short summary
Short summary
This paper focuses on internal tides in the marginal Solomon Sea where LLWBCs transit. The objective is to characterize such internal tides and to give some insights into their impacts on water mass transformation in this area of interest for the global circulation. Results are discussed for two contrasted ENSO conditions with different mesoscale activity and stratification. Such study is motivated by the next altimetric SWOT mission that will be able to observe such phenomena.
Violaine Piton, Marine Herrmann, Florent Lyard, Patrick Marsaleix, Thomas Duhaut, Damien Allain, and Sylvain Ouillon
Geosci. Model Dev., 13, 1583–1607, https://doi.org/10.5194/gmd-13-1583-2020, https://doi.org/10.5194/gmd-13-1583-2020, 2020
Short summary
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Consequences of tidal dynamics on hydro-sedimentary processes are a recurrent issue in estuarine and coastal processes studies, and accurate tidal solutions are a prerequisite for modeling sediment transport. This study presents the implementation and optimization of a model configuration in terms of bathymetry and bottom friction and assess the influence of these parameters on tidal solutions, in a macro-tidal environment: the Gulf of Tonkin (Vietnam).
Edward D. Zaron
Ocean Sci., 15, 1287–1305, https://doi.org/10.5194/os-15-1287-2019, https://doi.org/10.5194/os-15-1287-2019, 2019
Short summary
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Ocean forecasting systems predict ocean water level, but the accuracy of predictions varies as a function of the forecast lead time and the dynamics causing water level variability. This study investigates the accuracy of predictions of tidal water levels in the AMSEAS forecast system, with emphasis on the small (roughly 5 cm) fluctuations associated with the baroclinic tide.
Maxime Ballarotta, Clément Ubelmann, Marie-Isabelle Pujol, Guillaume Taburet, Florent Fournier, Jean-François Legeais, Yannice Faugère, Antoine Delepoulle, Dudley Chelton, Gérald Dibarboure, and Nicolas Picot
Ocean Sci., 15, 1091–1109, https://doi.org/10.5194/os-15-1091-2019, https://doi.org/10.5194/os-15-1091-2019, 2019
Short summary
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This study investigates the resolving capabilities of the DUACS gridded products delivered through the CMEMS catalogue. Our method is based on the noise-to-signal ratio approach. While altimeter along-track data resolve scales on the order of a few tens of kilometers, we found that the merging of these along-track data into continuous maps in time and space leads to effective resolution ranging from ~ 800 km wavelength at the Equator to 100 km wavelength at high latitude.
Michaël Ablain, Benoît Meyssignac, Lionel Zawadzki, Rémi Jugier, Aurélien Ribes, Giorgio Spada, Jerôme Benveniste, Anny Cazenave, and Nicolas Picot
Earth Syst. Sci. Data, 11, 1189–1202, https://doi.org/10.5194/essd-11-1189-2019, https://doi.org/10.5194/essd-11-1189-2019, 2019
Short summary
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A description of the uncertainties in the Global Mean Sea Level (GMSL) record has been performed; 25 years of satellite altimetry data were used to estimate the error variance–covariance matrix for the GMSL record to derive its confidence envelope. Then a least square approach was used to estimate the GMSL trend and acceleration uncertainties over any time periods. A GMSL trend of 3.35 ± 0.4 mm/yr and a GMSL acceleration of 0.12 ± 0.07 mm/yr² have been found within a 90 % confidence level.
Michel Tchilibou, Lionel Gourdeau, Rosemary Morrow, Guillaume Serazin, Bughsin Djath, and Florent Lyard
Ocean Sci., 14, 1283–1301, https://doi.org/10.5194/os-14-1283-2018, https://doi.org/10.5194/os-14-1283-2018, 2018
Short summary
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This paper is motivated by the next SWOT altimetric mission dedicated to the observation of mesoscale and submesoscale oceanic features. It focuses on tropical areas with a strong discrepancy in the spectral signature between altimetry and models. The paper reviews the spectral signature of tropical turbulence which presents a rich variety of phenomena depending on the latitudinal dependence of the Coriolis force. Internal tides observed by altimetry explain the discrepancy with the model.
Graham D. Quartly, Jean-François Legeais, Michaël Ablain, Lionel Zawadzki, M. Joana Fernandes, Sergei Rudenko, Loren Carrère, Pablo Nilo García, Paolo Cipollini, Ole B. Andersen, Jean-Christophe Poisson, Sabrina Mbajon Njiche, Anny Cazenave, and Jérôme Benveniste
Earth Syst. Sci. Data, 9, 557–572, https://doi.org/10.5194/essd-9-557-2017, https://doi.org/10.5194/essd-9-557-2017, 2017
Short summary
Short summary
We have produced an improved monthly record of mean sea level for 1993–2015. It is developed by careful processing of the records from nine satellite altimeter missions, making use of the best available orbits, instrumental corrections and geophysical corrections. This paper details the selection process and the processing method. The data are suitable for investigation of sea level changes at scales from seasonal to long-term sea level rise, including interannual variations due to El Niño.
David E. Cartwright, Philip L. Woodworth, and Richard D. Ray
Hist. Geo Space. Sci., 8, 9–19, https://doi.org/10.5194/hgss-8-9-2017, https://doi.org/10.5194/hgss-8-9-2017, 2017
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This paper discusses an historical record of the ocean tide made by the astronomer Manuel Johnson (a future President of the Royal Astronomical Society) at St. Helena in 1826–27. It describes how the measurements were made using a tide gauge of an unusual design, which recorded the heights of the high and low tides well, although information on their times were not so accurate. Johnson’s work is not well known. One objective of the present research was to make his measurements more accessible.
Marie-Isabelle Pujol, Yannice Faugère, Guillaume Taburet, Stéphanie Dupuy, Camille Pelloquin, Michael Ablain, and Nicolas Picot
Ocean Sci., 12, 1067–1090, https://doi.org/10.5194/os-12-1067-2016, https://doi.org/10.5194/os-12-1067-2016, 2016
Loren Carrere, Yannice Faugère, and Michaël Ablain
Ocean Sci., 12, 825–842, https://doi.org/10.5194/os-12-825-2016, https://doi.org/10.5194/os-12-825-2016, 2016
Short summary
Short summary
New dynamic atmospheric (DAC_ERA) and dry tropospheric (DT_ERA) correction have been computed for the altimeter period using the ERA-Interim meteorological reanalysis. The corrections improve sea level estimations in Southern Ocean and in shallow waters; the impact is the most important for the first decade of altimetry, when operational meteorological models had a weaker quality. DT_ERA remains better in the recent period. New corrections significantly impact long-term regional trends.
Lionel Zawadzki, Michaël Ablain, Loren Carrere, Richard D. Ray, Nikita P. Zelensky, Florent Lyard, Amandine Guillot, and Nicolas Picot
Ocean Sci. Discuss., https://doi.org/10.5194/os-2016-19, https://doi.org/10.5194/os-2016-19, 2016
Preprint withdrawn
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Mean sea level (MSL) is a prominent indicator of climatic change, and is therefore of great scientific and societal interest. Since the beginning of the altimeter mission TOPEX/Poseidon and its successors Jason-1 and Jason-2, MSL products became essential for climate applications. Since 1995, a suspicious signal is apparent in the corresponding MSL record. Since 2010, scientific teams have been working on reducing this error. This paper assesses, characterizes and quantifies this reduction.
J. M. Magalhaes, J. C. B. da Silva, M. C. Buijsman, and C. A. E. Garcia
Ocean Sci., 12, 243–255, https://doi.org/10.5194/os-12-243-2016, https://doi.org/10.5194/os-12-243-2016, 2016
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Satellite imagery reveals intense internal solitary waves (ISWs) seen hundreds of kilometres from the Amazon shelf and extending for 500 km into the open ocean (propagating above 3 m/s, amongst the fastest ever recorded). Seasonality is discussed in light of the North Equatorial Counter Current, and a late disintegration of the internal tide (IT) is investigated based on climatological data. A late disintegration of the IT may explain other ISW observations in the world’s oceans.
M. Ablain, A. Cazenave, G. Larnicol, M. Balmaseda, P. Cipollini, Y. Faugère, M. J. Fernandes, O. Henry, J. A. Johannessen, P. Knudsen, O. Andersen, J. Legeais, B. Meyssignac, N. Picot, M. Roca, S. Rudenko, M. G. Scharffenberg, D. Stammer, G. Timms, and J. Benveniste
Ocean Sci., 11, 67–82, https://doi.org/10.5194/os-11-67-2015, https://doi.org/10.5194/os-11-67-2015, 2015
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This paper presents various respective data improvements achieved within the European Space Agency (ESA) Climate Change Initiative (ESA CCI) project on sea level during its first phase (2010-2013), using multi-mission satellite altimetry data over the 1993-2010 time span.
C. Maraldi, J. Chanut, B. Levier, N. Ayoub, P. De Mey, G. Reffray, F. Lyard, S. Cailleau, M. Drévillon, E. A. Fanjul, M. G. Sotillo, P. Marsaleix, and the Mercator Research and Development Team
Ocean Sci., 9, 745–771, https://doi.org/10.5194/os-9-745-2013, https://doi.org/10.5194/os-9-745-2013, 2013
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Short summary
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.
Internal tides can have a signature of several centimeters at the ocean surface and need to be...
