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Water heavily fractionated as it ascends on Mars as revealed by ExoMars/NOMAD.
Villanueva, Geronimo L; Liuzzi, Giuliano; Crismani, Matteo M J; Aoki, Shohei; Vandaele, Ann Carine; Daerden, Frank; Smith, Michael D; Mumma, Michael J; Knutsen, Elise W; Neary, Lori; Viscardy, Sebastien; Thomas, Ian R; Lopez-Valverde, Miguel Angel; Ristic, Bojan; Patel, Manish R; Holmes, James A; Bellucci, Giancarlo; Lopez-Moreno, Jose Juan.
Afiliação
  • Villanueva GL; NASA Goddard Space Flight Center, Greenbelt, MD, USA. geronimo.villanueva@nasa.gov.
  • Liuzzi G; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • Crismani MMJ; Department of Physics, American University, Washington, DC, USA.
  • Aoki S; NPP/USRA, Goddard Space Flight Center, Greenbelt, MD, USA.
  • Vandaele AC; California State University, San Bernardino, Department of Physics, CA USA.
  • Daerden F; Royal Belgian Institute for Space Aeronomy, Brussels, Belgium.
  • Smith MD; University of Liege, Liege, Belgium.
  • Mumma MJ; California State University, San Bernardino, Department of Physics, CA USA.
  • Knutsen EW; California State University, San Bernardino, Department of Physics, CA USA.
  • Neary L; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • Viscardy S; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • Thomas IR; NASA Goddard Space Flight Center, Greenbelt, MD, USA.
  • Lopez-Valverde MA; Department of Physics, American University, Washington, DC, USA.
  • Ristic B; Royal Belgian Institute for Space Aeronomy, Brussels, Belgium.
  • Patel MR; Royal Belgian Institute for Space Aeronomy, Brussels, Belgium.
  • Holmes JA; Royal Belgian Institute for Space Aeronomy, Brussels, Belgium.
  • Bellucci G; Instituto de Astrofísica de Andalucía, Granada, Spain.
  • Lopez-Moreno JJ; Royal Belgian Institute for Space Aeronomy, Brussels, Belgium.
Sci Adv ; 7(7)2021 Feb.
Article em En | MEDLINE | ID: mdl-33568473
ABSTRACT
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.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2021 Tipo de documento: Article
Texto completo
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2021 Tipo de documento: Article