Ocean Science
Ocean Science
OS
Articles | Volume 22, issue 4
Articles | Volume 22, issue 4
https://doi.org/10.5194/os-22-2491-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-22-2491-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 22, issue 4
Technical note
 | 
17 Aug 2026
Technical note |  | 17 Aug 2026

Evaluate the impact of a 4 h tandem phase on the continuity of nadir altimetry measurements between S3 and S3NG-T

Noémie Lalau, Michaël Ablain, Thomas Vaujour, François Boy, Gerald Dibarboure, and Alejandro Egido

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Short summary
We investigated how to maintain continuous sea level measurements between current Sentinel-3 constellation and the upcoming Sentinel-3 Next Generation Topography mission. Because of new satellite designs, a 4-hour delay will exists between observations during the calibration phase. By simulating this time lag, we found that, despite increased uncertainty, reliable calibration is possible. Extending this phase to one year ensures a stable, long-term record for climate and ocean monitoring.
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