Essential Insights
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NASA’s Sentinel-6 Michael Freilich satellite aims to enhance global sea level monitoring, with initial data already showing promise and a projected rate of sea level rise at 0.16 inches (4 mm) per year due to glacier melt and thermal expansion.
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The satellite will work in tandem with the Jason-3 satellite for cross-calibration, with the first public sea level data expected within six months, enabling improved understanding and projections of sea level changes.
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In addition to sea level measurements, Sentinel-6 is equipped to monitor atmospheric temperature and humidity, enhancing weather and hurricane forecasts.
- This mission marks a continuation of nearly 30 years of collaboration between U.S. and European satellites to accurately measure sea surface height, with contributions from NASA, ESA, and EUMETSAT, supporting global climate and oceanography research.
NASA and its European partners have achieved a significant milestone. The Sentinel-6 Michael Freilich satellite has returned its first sea level measurements. “Christmas came early this year,” said Josh Willis, project scientist at NASA’s Jet Propulsion Laboratory. “And right out of the box, the data look fantastic.”
This satellite is part of a long-term effort to track global ocean height from space, dating back to the early 1990s. Since then, sea levels have risen at an increased pace, now averaging 0.16 inches—or four millimeters—per year. Scientists attribute this rise primarily to melting glaciers and ice sheets, along with the expansion of seawater as it warms.
Karen St. Germain, director of NASA’s Earth Science Division, emphasized the importance of this data. “When we combine the data from instruments like the altimeter on Sentinel-6 with data from other satellites, we can understand how much of the sea level rise comes from melting ice and how much results from ocean warming. This understanding allows NASA to improve future sea level rise projections.”
Right now, the Sentinel-6 Michael Freilich operates in a preliminary orbit of 11.4 miles lower than its planned operational height of 830 miles above Earth. Engineers aim to position the satellite into its final orbit by mid-December. It will work in tandem with the Jason-3 satellite for a period of six to twelve months. This collaboration will help ensure precision in ongoing sea level measurements. Once data quality meets standards, Sentinel-6 will become the primary satellite for sea level monitoring.
The first publicly available sea level data from Sentinel-6 is expected in about six months, with additional data to follow within a year. Manfred Lugert, program manager for the project at the European Organisation for the Exploitation of Meteorological Satellites, stated that they are preparing operational systems to support data processing. “This will keep us busy for the next few months as we carefully validate and fine-tune the data,” he explained.
In addition to tracking sea levels, Sentinel-6 Michael Freilich also monitors atmospheric temperature and humidity. These measurements aim to enhance weather forecasting, including predictions of hurricanes. Engineers activated this instrument on November 27, and initial data shows promising results.
Named after former NASA Earth Science chief Michael Freilich, who passed away in 2020, the satellite symbolizes a commitment to continuing advancements in ocean observation. “I think he would be proud,” said Willis. “Like Mike himself, we expect great things from the satellite that bears his name.”
The Sentinel-6 program includes another identical satellite, Sentinel-6B, set to launch in 2025. Together, they will build on nearly 30 years of sea level data, providing essential insights into over 90% of the world’s oceans. These satellites will support various fields, including climate research, marine meteorology, and operational oceanography.
The partnership between NASA, the European Space Agency, EUMETSAT, and others underscores a collective effort to expand our understanding of Earth’s changing climate. Funding support comes from the European Commission and the National Centre for Space Studies in France, highlighting the global significance of this mission.
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