Sentinel-6B: A New Chapter in Ocean Monitoring
On 17 November 2025, the Copernicus Sentinel-6B satellite successfully launched aboard a Falcon 9 rocket from Vandenberg Space Force Base. The satellite will extend the long-term global sea-level dataset that began in the early 1990s, offering scientists unparalleled insights into the pace and patterns of rising oceans.
The Importance of Sentinel-6B
Sentinel-6B is part of the Jason-CS/Sentinel-6 mission, a partnership between ESA, NASA, EUMETSAT, NOAA, and CNES. Its mission is to maintain continuity in high-precision sea-surface height measurements, ensuring that climate scientists can distinguish long-term sea-level trends from short-term natural variations.
Advanced Technology for High-Accuracy Measurements
- Poseidon-4 Radar Altimeter: Measures sea-surface height with centimetre-level precision.
- AMR-C Radiometer: Tracks atmospheric water vapor to correct radar signals and improve accuracy.
- GNSS Radio Occultation: Provides data for atmospheric profiling, improving weather forecasts.
- Precision Orbit Determination: GNSS receivers, LRA, and DORIS ensure the satellite’s exact position is known.
Mission Goals and Global Collaboration
Sentinel-6B represents the power of international cooperation. The mission’s goals include monitoring global sea-level rise, improving ocean forecasting, strengthening climate research, and supporting coastal protection strategies.
Scientists rely on this mission to refine climate models, understand heat distribution in the oceans, and better predict extreme events such as storms and flooding.
Tandem Flight for Calibration
For the next year, Sentinel-6B will fly in tandem with its twin satellite, Sentinel-6 Michael Freilich. This overlap ensures seamless calibration and data alignment, preserving the continuity and accuracy of the long-term sea-level record.
Why This Mission Matters for Society
With sea levels rising at an accelerating pace, coastal regions face mounting risks, including erosion, flooding, and storm surges. Sentinel-6B provides the data needed for governments and communities to prepare and adapt.
The satellite’s atmospheric data also supports weather forecasting, contributing to better climate predictions and improved emergency preparedness.
Looking Ahead
Sentinel-6B will operate until at least 2030, securing another five years of high-quality measurements. This continuity is essential for tracking long-term climate change impacts and for informing adaptation policies worldwide.
Sources
- ESA – Sentinel-6B Launch Reports
- NASA Jet Propulsion Laboratory – Mission Overview
- Copernicus Programme – Ocean Monitoring Updates
- EUMETSAT – Sentinel-6B Mission Data
- Airbus – Sentinel-6B Manufacturing and Launch Details
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