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Airbus Continues to Collaborate with NASA to Monitor Climate Change from Space
March 22, 2024 | AirbusEstimated reading time: 3 minutes
Airbus has been awarded a contract to design and build the GRACE-C twin spacecraft by NASA’s Jet Propulsion Laboratory JPL (Pasadena, California). This new mission of NASA and the German Space Agency at the German Aerospace Center (DLR) will strengthen the more than 20 year long partnership between the USA and Germany to ensure uninterrupted measurement of the Earth's gravity field, which started in 2002 with GRACE and continues with GRACE Follow-On, launched in 2018.
During its five year nominal mission lifetime, the GRACE-C Mission (Gravity Recovery And Climate Experiment-Continuity) will continue the series of measurements observing how Earth’s groundwater, oceans, ice sheets, and land shift, month-to-month, by measuring changes in the planet’s gravity field.
Alain Fauré, Head of Space Systems at Airbus, said: “It is amazing to think that, without looking down at Earth, two satellites more than 200 km away from each other, can tell us how quickly our ice sheets are melting. In environmental monitoring, continuity is key. The valuable data provided by the previous GRACE missions is testament to their success and it is great news that Airbus continues to be part of this international mission providing the tools to measure how our climate is evolving.”
GRACE-C consists of two identical satellites flying around 200 km apart at an orbit altitude of 500 km with an inclination of 89 degrees. Each satellite will measure approximately 3 x 2 x 1 metres and weigh around 600 kg. Launch is planned no earlier than late 2028 from the USA.
Like its predecessors, the GRACE-C mission is designed to precisely measure small distance changes between the satellites due to gravity variations, with an unprecedented precision down to the micron. As the pair of satellites circle the Earth, areas of slightly stronger gravity (greater mass concentration) will affect the spacecraft’s positions and hence the distance between them. The extremely precise microwave ranging system will detect these changes and enable the mapping of Earth’s gravity field with unmatched accuracy.
Over the months and years, the comparison of these gravity maps, or the evolution of mass concentrations, will enable scientists to assess the global water balance, including groundwater tables and ice sheets, and the influence of climate change. It will also provide insights into deep and surface currents in oceans and ocean height contributors.
GRACE-C is a rebuild of the two GRACE Follow-On satellites with upgraded avionics based on state-of-the-art technology and the joint US-German Laser Ranging Interferometer (LRI), already flown on GRACE Follow-On as an experimental payload, now being the main ranging instrument.
The mission is based on a NASA/DLR interagency partnership: German contributions are funded by the Federal German Ministry of Economic Affairs and Climate Action as well as the Federal and Ministry of Education and Research. The optical bench of the LRI instrument is built by SpaceTech GmbH in close cooperation with the Max Planck Institute Gravitational Science (Albert Einstein Institute).
Airbus Defence and Space in Friedrichshafen will design, build and deliver the satellites to the launch site, including Launch and Early Orbit Phase (LEOP) support for NASA/JPL. The mission will be operated by the German Space Operations Center (GSOC) of DLR.
GRACE-C – a successful series of missions to observe Earth’s environment continues
GRACE-C is a joint mission of the US space agency NASA and the German Space Agency at the German Aerospace Center (Deutsches Zentrum für Luft- und Raumfahrt; DLR). The German contribution is being realised with funds from the Federal Ministry for Economic Affairs and Climate Action (Bundesministerium für Wirtschaft und Klimaschutz; BMWK) and the Federal Ministry of Education and Research (Bundesministerium für Bildung und Forschung; BMBF). This is supported by contributions from other project partners on the German side. The GeoForschungsZentrum Potsdam (GFZ) will be responsible for the scientific evaluation of the mission data and the Max Planck Institute for Gravitational Physics (Albert Einstein Institute) together with the company SpaceTech GmbH in Immenstaad for the construction of the laser system to measure the distance between the GRACE-C spacecraft
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