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Earth System Mass Transport Mission (e.motion): A Concept for Future Earth Gravity Field Measurements from Space |
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| Authors: | I Panet J Flury R Biancale T Gruber J Johannessen M R van den Broeke T van Dam P Gegout C W Hughes G Ramillien I Sasgen L Seoane M Thomas |
| Institution: | 1. Laboratoire LAREG, Institut National de l’Information Géographique et Forestière, GRGS Université Paris Diderot, Batiment Lamarck A, 5 rue Thomas Mann, Case 7011, 75205, Paris Cedex 13, France 2. Institut de Physique du Globe de Paris (IPGP, Sorbonne Paris Cité, UMR 7154 CNRS, Université Paris Diderot), Paris, France 3. Centre for Quantum Engineering and Space-Time Research, Leibnitz Universit?t Hannover, Hannover, Germany 4. CNES/GRGS, Géoscience Environnement Toulouse, UMR 5563 CNRS, Observatoire Midi-Pyrénées, Toulouse, France 5. Institut für Astronomische und Physikalische Geod?sie, Technische Universit?t München, Munich, Germany 6. Nansen Environmental and Remote Sensing Center, Bergen, Norway 7. Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, The Netherlands 8. Faculté des Sciences, de la Technologie et de la Communication, Université du Luxembourg, Luxembourg, Luxembourg 12. Géoscience Environnement Toulouse, UMR 5563 CNRS, GRGS, Observatoire Midi-Pyrénées, Toulouse, France 9. National Oceanography Centre, Liverpool, UK 10. German Research Centre for Geosciences (GFZ), Potsdam, Germany 11. Université Paul Sabatier, GET, UMR 5563 CNRS, GRGS, Observatoire Midi-Pyrénées, Toulouse, France |
| Abstract: | In the last decade, satellite gravimetry has been revealed as a pioneering technique for mapping mass redistributions within the Earth system. This fact has allowed us to have an improved understanding of the dynamic processes that take place within and between the Earth’s various constituents. Results from the Gravity Recovery And Climate Experiment (GRACE) mission have revolutionized Earth system research and have established the necessity for future satellite gravity missions. In 2010, a comprehensive team of European and Canadian scientists and industrial partners proposed the e.motion (Earth system mass transport mission) concept to the European Space Agency. The proposal is based on two tandem satellites in a pendulum orbit configuration at an altitude of about 370 km, carrying a laser interferometer inter-satellite ranging instrument and improved accelerometers. In this paper, we review and discuss a wide range of mass signals related to the global water cycle and to solid Earth deformations that were outlined in the e.motion proposal. The technological and mission challenges that need to be addressed in order to detect these signals are emphasized within the context of the scientific return. This analysis presents a broad perspective on the value and need for future satellite gravimetry missions. |
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