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Villanueva GL, Liuzzi G, Crismani MMJ, Aoki S, Vandaele AC, Daerden F, Smith MD, Mumma MJ, Knutsen EW, Neary L, Viscardy S, Thomas IR, Lopez-Valverde MA, Ristic B, Patel MR, Holmes JA, Bellucci G, Lopez-Moreno JJ. Water heavily fractionated as it ascends on Mars as revealed by ExoMars/NOMAD. SCIENCE ADVANCES 2021; 7:7/7/eabc8843. [PMID: 33568473 PMCID: PMC7875534 DOI: 10.1126/sciadv.abc8843] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Accepted: 12/02/2020] [Indexed: 06/12/2023]
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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Affiliation(s)
| | - Giuliano Liuzzi
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
- Department of Physics, American University, Washington, DC, USA
| | - Matteo M J Crismani
- NPP/USRA, Goddard Space Flight Center, Greenbelt, MD, USA
- California State University, San Bernardino, Department of Physics, CA USA
| | - Shohei Aoki
- Royal Belgian Institute for Space Aeronomy, Brussels, Belgium
- University of Liege, Liege, Belgium
| | | | - Frank Daerden
- California State University, San Bernardino, Department of Physics, CA USA
| | | | | | - Elise W Knutsen
- NASA Goddard Space Flight Center, Greenbelt, MD, USA
- Department of Physics, American University, Washington, DC, USA
| | - Lori Neary
- Royal Belgian Institute for Space Aeronomy, Brussels, Belgium
| | | | - Ian R Thomas
- Royal Belgian Institute for Space Aeronomy, Brussels, Belgium
| | | | - Bojan Ristic
- Royal Belgian Institute for Space Aeronomy, Brussels, Belgium
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Kumar A, Kołaski M, Lee HM, Kim KS. Photoexcitation and Photoionization Dynamics of Water Photolysis. J Phys Chem A 2008; 112:5502-8. [DOI: 10.1021/jp711485b] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Anupriya Kumar
- Center for Superfunctional Materials and Basic Science Research Institute, Department of Chemistry, Pohang University of Science and Technology, San 31, Hyojadong, Namgu, Pohang 790-784, Korea
| | - Maciej Kołaski
- Center for Superfunctional Materials and Basic Science Research Institute, Department of Chemistry, Pohang University of Science and Technology, San 31, Hyojadong, Namgu, Pohang 790-784, Korea
| | - Han Myoung Lee
- Center for Superfunctional Materials and Basic Science Research Institute, Department of Chemistry, Pohang University of Science and Technology, San 31, Hyojadong, Namgu, Pohang 790-784, Korea
| | - Kwang S. Kim
- Center for Superfunctional Materials and Basic Science Research Institute, Department of Chemistry, Pohang University of Science and Technology, San 31, Hyojadong, Namgu, Pohang 790-784, Korea
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Mar KA, McCarthy MC, Connell P, Boering KA. Modeling the photochemical origins of the extreme deuterium enrichment in stratospheric H2. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006jd007403] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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