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Título: | Water heavily fractionated as it ascends on Mars as revealed by ExoMars/NOMAD |
Autor: | Villanueva, Geronimo L.; Liuzzi, Giuliano; Crismani, M. M. J.; Aoki, Shohei; Vandaele, Ann Carine; Daerden, Frank; Smith, M.D.; Mumma, M.J.; Knutsen, E. W.; Neary, L.; Viscardy, S.; Thomas, Ian R.; López-Valverde, M. A. CSIC ORCID ; Ristic, Bojan; Patel, Manish R.; Holmes, J. A.; Bellucci, Giancarlo; López-Moreno, José Juan CSIC ORCID | Fecha de publicación: | 10-feb-2021 | Editor: | American Association for the Advancement of Science | Citación: | Science advances 7(7): eabc8843 (2021) | Resumen: | Isotopic ratios and, in particular, the water D/H ratio are powerful tracers of the evolution and transport of water on Mars. From measurements performed with ExoMars/NOMAD, we observe marked and rapid variability of the D/H along altitude on Mars and across the whole planet. The observations (from April 2018 to April 2019) sample a broad range of events on Mars, including a global dust storm, the evolution of water released from the southern polar cap during southern summer, the equinox phases, and a short but intense regional dust storm. In three instances, we observe water at very high altitudes (>80 km), the prime region where water is photodissociated and starts its escape to space. Rayleigh distillation appears the be the driving force affecting the D/H in many cases, yet in some instances, the exchange of water reservoirs with distinctive D/H could be responsible. © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. | Descripción: | This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited. | Versión del editor: | http://dx.doi.org/10.1126/sciadv.abc8843 | URI: | http://hdl.handle.net/10261/240369 | DOI: | 10.1126/sciadv.abc8843 | ISSN: | 2375-2548 |
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