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© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 08 Jan 2019

Research article | 08 Jan 2019

Review status
This discussion paper is a preprint. A revision of the manuscript is under review for the journal Ocean Science (OS).

DUACS DT-2018: 25 years of reprocessed sea level altimeter products

Guillaume Taburet1, Antonio Sanchez-Roman2, Maxime Ballarotta1, Marie-Isabelle Pujol1, Jean-François Legeais1, Florent Fournier1, Yannice Faugere1, and Gerald Dibarboure3 Guillaume Taburet et al.
  • 1Collecte Localisation Satellites, Parc Technologique du Canal, 8-10 rue Hermès, 31520 Ramonville-Saint-Agne, France
  • 2Instituto Mediterráneo de Estudios Avanzados, C/Miquel Marquès, 21 – 07190 Esporles – Illes Balears, Spain
  • 3Centre National d’Etudes Spatiales, 18 avenue Edouard Belin, 31400 Toulouse, France

Abstract. For more than twenty years, the multi-satellite DUACS system has been providing Near Real Time (NRT) and Delayed Time (DT) altimetric products. These data are ranging from along-track to multi-mission maps of Sea Level Anomaly (SLA) and Absolute Dynamic Topography (ADT). A reprocessing of 25 years of data, namely: DUACS DT2018, has been carried out and is available through the Copernicus Marine Environment Monitoring Service (CMEMS) and Copernicus Climate Change Service (C3S) since April 2018.

Several changes have been implemented in the DT2018 processing in order to improve the quality of the products. New altimeter standards and geophysical corrections has been used, refined data selection has been implemented and Optimal Interpolation (OI) parameters have been reviewed for global and regional map generation.

Through this paper, an extensive assessment has been carried out. The error budget associated to the DT2018 products at global and regional scales has been refined and the improvements compared with the previous version quantified (DT2014; Pujol et al., 2016). The DT2018 errors at mesoscales are reduced by nearly 3 to 4 % for global and regional products compared to the DT2014. This reduction is much more important in coastal areas (reduction is up to 10 %) where it is directly linked to the altimeter geophysical corrections used in the DT2018 processing. Conclusions are very similar concerning geostrophic currents, where error is reduced by 5 % and up to 10 % in coastal areas.

Guillaume Taburet et al.
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Status: final response (author comments only)
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Guillaume Taburet et al.
Guillaume Taburet et al.
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Publications Copernicus
Short summary
This paper deals with sea level altimeter products. These geophysical data are distributed as along-track and gridded data through Copernicus program CMEMS and C3S. We present here in detail a new reprocessing of the data (DT2018) from 1993 to 2017. The main changes and their impacts since last version (DT2014) are carefully discussed. This comparison is made using independent dataset. DT2018 sea level products are improved at global and regional scale and especially in coastal areas.
This paper deals with sea level altimeter products. These geophysical data are distributed as...