August 17, 2025Marine GeodesyOpen Access

Towards 0.1mm/yr stability over decades for measuring sea level using tide gauges together with GNSS-based instruments?

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The analysis shows that the stability of tide gauges is better than 0.1 mm/yr, indicating high precision in measurements.
Tide gauges and GNSS-based instruments were utilized to analyze sea level trends over a 26-year period at the Corsica site.
Long-term data shows an average sea level increase of +4.4 mm/yr, exceeding global estimates due to regional factors.
The findings underscore the importance of GNSS-based systems for accurate calibration and validation of sea level measurements.

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Analysis reveals sea level increase of +4.4 mm/yr at Corsica, highlighting the role of GNSS in tide gauge validation.

Bonnefond et al. (2025) studied this question.

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