P036-07
Simulating D/H and atmospheric chemistry on Mars and comparing with NOMAD observations

Thursday, 10 December 2020: 05:54
Virtual
Frank Daerden1, Lori Neary2, Geronimo Villanueva3, Shohei Aoki2, Sebastien Viscardy2, Robert Todd Clancy4, Franck Lefèvre5, Arianna Piccialli2, Yannick Willame2, Alain S.J. Khayat3, Michael D Smith3, Giuliano Liuzzi6, Matteo Crismani7, Michael J Wolff8, Bradford J Sandor9, Manish Patel10, Jon Mason10, James A Whiteway11, Sophie Bauduin12, Jimmy Bouche13, Michael J Mumma3, Jean-Claude M. C. Gerard14, Miguel A Lopez-Valverde15, Marco Giuranna16, Justin Erwin2, Séverine Robert2, Loïc Trompet2, Cédric Depiesse2, Bojan Ristic1, Ian Thomas17, Giancarlo Bellucci16, Jose J Lopez-Moreno18, Ann Carine Vandaele1 and NOMAD Science Team, (1)Royal Belgian Institute for Space Aeronomy, Brussels, Belgium, (2)Royal Belgian Insitute for Space Aeronomy, Brussels, Belgium, (3)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (4)Space Science Institute Boulder, Boulder, CO, United States, (5)LATMOS Laboratoire Atmosphères, Observations Spatiales, Sorbonne université, UVSQ Université Paris-Saclay, CNRS, Paris, France, (6)AU / NASA Goddard Space Flight Center, Greenbelt, United States, (7)NASA Goddard Space Flight Center, Greenbelt, United States, (8)Space Science Institute, Boulder, CO, United States, (9)Space Science Inst, Boulder, CO, United States, (10)Open University, Milton Keynes, United Kingdom, (11)York Univ, Toronto, ON, Canada, (12)Université Libre de Bruxelles, Brussels, Belgium, (13)Université Libre de Bruxelles, Brussel, Belgium, (14)Université de Liège, LPAP - STAR Institute, Liege, Belgium, (15)Institut Astrofísica Andalucía, Granada, Spain, (16)IAPS-INAF, Rome, Italy, (17)Belgian Institute for Space Aeronomy, Brussels, Belgium, (18)Inst Astrofisica Andalucia, Granada, Spain
Recorded Presentation
Abstract:
The NOMAD instrument suite on the ESA-Roskosmos ExoMars Trace Gas Orbiter (TGO) observes the physical and chemical composition of the Martian atmosphere with highly resolved vertical profiles and nadir sounding in the IR and UV-vis domains. Vertically resolved profiles of, amongst other species, water vapor, HDO, ozone, CO, CO2, oxygen airglow, dust and clouds were obtained for more than one Martian year [1-6]. We will provide detailed comparisons of simulations with the GEM-Mars General Circulation Model (GCM) [7-9] including atmospheric chemistry, to several of these new observational datasets. In specific, during its first year of operations, NOMAD witnessed the 2018 Global Dust Storm (GDS) during its onset, peak and decline. The redistribution of water vapor to high altitudes and latitudes observed during the GDS was explained using the GEM-Mars General Circulation Model (GCM) [9]. The photolysis products of water vapor are a major driver for the atmospheric chemistry on Mars. As water vapor is redistributed over the atmosphere, it is expected to have considerable impact on many other species. GEM-Mars contains routines for atmospheric chemistry and here we present some results of the simulated impact of the GDS on atmospheric chemistry and on several of the observed species. GEM-Mars now also includes the simulation of HDO and the fractionation of water vapor upon cloud formation. The simulations will be compared with the vertical profiles of the D/H ratio obtained from NOMAD observations. The impact of the GDS on D/H can be estimated from these simulations.

References

[1] Vandaele, A. C. et al. (2019), Nature, https://doi.org/10.1038/s41586-019-1097-3. [2] Aoki, S. et al. (2019), J. Geophys. Res.: Planets, https://doi.org/10.1029/2019JE006109. [3] Liuzzi, G. et al. (2019), J. Geophys. Res.: Planets, https://doi.org/10.1029/2019JE006250. [4] Gérard et al. (2020), Nature Astronomy, https://doi.org/10.1038/s41550-020-1123-2. [5] Villanueva et al.,2020, in rev. [6] Korablev et al., 2020, in rev. [7] Neary, L. and F. Daerden (2018), Icarus, https://doi.org/10.1016/j.icarus.2017.09.028. [8] Daerden, F. et al. (2019), Icarus, 326, https://doi.org/10.1016/j.icarus.2019.02.030. [9] Neary, L. et al. (2020), Geophys. Res. Lett., https://doi.org/10.1029/2019GL084354

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