The Advanced Microwave Radiometer for Climate monitoring (AMR-C) being integrated on to the Copernicus Sentinel-6A satellite. The photo shows teams at Airbus in Friedrichshafen, Germany, lowering the instrument on to the satellite prior to mechanical mounting and alignment checks. As part of the international cooperation for this mission, the radiometer has been supplied by NASA JPL. The satellite’s main instrument is a radar altimeter to measure sea-surface height. The radiometer accounts for the amount of water vapour in atmosphere, which affects the speed of the altimeter’s radar pulses. Copernicus Sentinel-6 will be a two-satellite constellation to monitor global sea level to understand long-term climate variations. Importantly, the mission will continue the measurements that have been supplied by the Topex-Poseidon and Jason missions since the 1990s