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The Copernicus Sentinel-6 mission is getting ready to chart the sea level

on 19 April 2019

Global sea level rose on average by 3.2 mm a year between 1993 and 2018, but hidden within this average is the fact that the rate of rise has been accelerating over the last few years. 

Taking measurements of the height of the sea surface is essential to monitoring this worrying trend and the Copernicus Sentinel-6 mission is on the way to being ready to do just this. The mission will be a constellation of two identical satellites that are launched sequentially.

Over the next decade, the Copernicus Sentinel-6A and then Sentinel-6B satellites will take the role of reference missions, picking up the task of continuing the long-term record of sea-surface height measurements that have so far been supplied by the French–US Topex-Poseidon and Jason missions.

The Copernicus Sentinel-6 satellites will each carry a radar altimeter, which works by measuring the time it takes for radar pulses to travel to Earth’s surface and back again to the satellite. Combined with precise satellite location data, altimetry measurements yield the height of the sea surface.

With Copernicus Sentinel-6A scheduled for liftoff at the end of next year, the satellite is currently being equipped with its measuring instruments.

While it is one of the European Union’s family of Copernicus satellite missions, which all deliver a wealth of information for a number of environmental services, Copernicus Sentinel-6 is also being realised thanks to cooperation between ESA, NASA, NOAA and Eumetsat.

Image credit: Airbus