The Sentinel-6B satellite has started delivering low-latency data to scientists, providing a critical update to the global effort of monitoring the current historic El Niño. Launched last November as part of the Copernicus Sentinel-6/Jason-CS mission, the spacecraft is now operating in tandem with its predecessor, Sentinel-6 Michael Freilich, flying just 30 seconds behind it to ensure seamless continuity of sea level measurements.
Precision altimetry for rapid intensification
The primary objective is to improve the prediction of hurricane strength, particularly during the volatile 48-hour window before landfall when storms can rapidly intensify. By using a radar altimeter to measure ocean height, wave size, and wind speed, the mission provides insights into ocean heat content—since warmer water expands and fuels storm growth.
This data is essential for algorithms like NOAA's Satellite Ocean Heat Content Suite, which helps federal and state agencies decide on evacuations and resource mobilization. Deirdre Byrne, an oceanographer at NOAA, expects to integrate the high-quality Sentinel-6 data into these algorithms by the end of the year.
Monitoring a historic El Niño
The current El Niño event, which AlexTech.ai previously reported as starting in June 2026, has evolved into a phenomenon of historic proportions. According to Josh Willis of NASA's Jet Propulsion Laboratory, the event reached a strength comparable to the major El Niños of 1997 and 2015, shifting hurricane activity from the Atlantic toward the Pacific.
Beyond altimetry, Sentinel-6B carries a Global Navigation Satellite System – Radio Occultation (GNSS-RO) instrument to measure atmospheric pressure, temperature, and humidity. This multi-instrument approach allows for a comprehensive understanding of how redistributed ocean heat alters global weather patterns.
Continuity and reference standards
The mission extends a sea level record that began in 1992 with TOPEX/Poseidon. Sentinel-6B is scheduled to replace Sentinel-6 Michael Freilich as the official reference satellite for global sea level measurements later this year. This transition is vital because consistent measurement methods allow scientists to distinguish between natural variability and long-term climate trends.
The project is a joint effort involving ESA, EUMETSAT, NASA, and NOAA, with technical support from CNES. NASA's JPL contributed the GNSS-RO, the Advanced Microwave Radiometer, and the Laser Retroreflector Array to ensure the highest possible data quality for climate research.
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