Ocean Science
Ocean Science
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Articles | Volume 21, issue 1
Articles | Volume 21, issue 1
https://doi.org/10.5194/os-21-325-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-21-325-2025
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 21, issue 1
Research article
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 | 
04 Feb 2025
Research article | Highlight paper |  | 04 Feb 2025

Internal tides off the Amazon shelf in the western tropical Atlantic: analysis of SWOT Cal/Val mission data

Michel Tchilibou, Loren Carrere, Florent Lyard, Clément Ubelmann, Gérald Dibarboure, Edward D. Zaron, and Brian K. Arbic

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Co-editor-in-chief
This study is based on observations from the new swath altimetry satellite SWOT. It is the first to describe and characterise internal tides using this new altimetry mission. It therefore highlights the 2D potential of SWOT and opens up new prospects for studying the variability of the internal tide.
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Short summary
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.
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