Sentinel-3C Begins Sending Earth Observations
The European Space Agency's newest Sentinel-3 satellite has returned its first observations, including ice sheet height measurements over Greenland.
Updated on Nov. 4, 2026 in Current Conditions
Sentinel-3C returned its first Earth observations from its ocean and land colour instrument and synthetic aperture radar altimeter. The altimeter measured Greenland Ice Sheet height between 30 September and 4 October, and its tracks closely match the reference digital elevation model.
Why it matters
Monitoring ice sheet height helps scientists understand climate change impacts and improve sea-level rise predictions, since ice loss from the ice sheets is a major contributor to rising seas. The altimeter is performing well, indicating the mission is on track for routine use.
The altimeter's measurements were checked against a reference digital elevation model and all tracks closely match it, though no specific height values were reported. The sea and land surface temperature radiometer has not yet delivered its first observations, leaving that instrument's results unknown.
The players
European Space Agency (ESA)
The European Space Agency is the intergovernmental body that develops and commissions the Sentinel-3 satellites and delivers land, cryosphere, inland water and offline atmospheric products.
Eumetsat
The European Organisation for the Exploitation of Meteorological Satellites is responsible for routine Sentinel-3 operations and the delivery of marine and atmospheric data.
The details
Sentinel-3C's altimeter measures changes in the height of lakes, rivers, sea ice and land ice, and its readings are compared against a reference digital elevation model. ESA is responsible for developing and commissioning the Sentinel-3 satellites, after which ESA and Eumetsat jointly manage the mission, with Eumetsat handling routine operations and marine and atmospheric data delivery.
Timeline
30 September to 4 October: Altimeter measures Greenland Ice Sheet height.
4 November 2026: Article announces Sentinel-3C's first Earth observations.
Program Context
Sentinel-3C is part of the Copernicus programme, the EU's Earth observation component, and extends the Sentinel-3 series that monitors ocean, land and ice. Its altimeter adds to the ice-height record used to track ice sheet loss and sea-level rise.
The data from Sentinel-3C feeds into the sea-level and ice monitoring that informs coastal planning and climate projections. Readers are not directly affected by the satellite's commissioning, but its measurements contribute to the forecasts used by governments and researchers.
The takeaway
Satellite measurements of ice sheet height give scientists a steady record of how fast polar ice is changing. That record is a key input for estimating how much sea levels will rise in coming decades.
Further reading
For more on how satellites track conditions as they change, explore Current Conditions.
Source note: This article includes information reported by European Space Agency (ESA).
