JpGU-AGU Joint Meeting 2017

Presentation information

[EJ] Oral

P (Space and Planetary Sciences) » P-PS Planetary Sciences

[P-PS05] [EJ] Mars and Mars system: results from a broad spectrum of Mars studies and aspects for future missions

Sat. May 20, 2017 10:45 AM - 12:15 PM Convention Hall A (International Conference Hall 2F)

convener:Hideaki Miyamoto(University of Tokyo), Tomohiro Usui(Earth-Life Science Institute, Tokyo Institute of Technology ), Ayako Matsuoka(Research Division for Space Plasma, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency), Sushil K Atreya(University of Michigan Ann Arbor), Chairperson:Sushil Atreya(University of Michigan Ann Arbor), Chairperson:Ayako Matsuoka(Research Division for Space Plasma, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency)

12:00 PM - 12:15 PM

[PPS05-06] The evolution of redox gradients on Mars in space and time

*Vlada Stamenkovic1,2, Lewis Ward1, Woodward Fischer1, Michael Mischna2, Michael Russell2 (1.California Institute of Technology, 2.Jet Propulsion Laboratory)

Keywords:Mars, Astrobiology, Landing Sites

From its deep interior to its atmosphere, a rocky planet can generate nutrients and redox gradients critical for the emergence and the evolution of life. We focus on the implications for life on modern Mars and potential changes in the last 20 Myr and the next 10 Myr from a 3D time-dependent perspective - by studying the spatial and temporal evolution of oxygen- and hydrogen-rich planetary niches.

We use time-dependent geodynamic models, capable of computing the 3D temperature profile and self-consistently accounting for serpentinization and radiolysis reactions as a function of subsurface temperature, pressure, and chemistry throughout the last 4.5 billion years (based on [1]-[4]). Additionally, we couple a parameterized climate model, which computes the local average annual surface temperature and pressure varying with obliquity and has been gauged with the Mars Weather Research and Forecasting (MarsWRF) GCM. MarsWRF is a global model based on the terrestrial mesoscale WRF model (see [5]-[7]) and is a Mars-specific implementation of the PlanetWRF GCM [8].

Geodynamic and climate models combined allow us to compute for Mars the time-dependent 3D distribution of 1) hydrogen-rich reducing subsurface environments, driven by serpentinization and radiolysis of water, and 2) oxygen-rich regions as a product of atmosphere-brine interactions governed by climate and surface chemistry. We will show spatial maps of such zones and results on their variability in the last 20 Myr and discuss implications for life, planetary protection, and landing site selection on Mars.

References. [1] Stamenkovic, V., Noack, L., Breuer, D., Spohn, T. (2012) The Astrophysical Journal, 748, 41-63. [2] Stamenkovic, V. (2015) In: Gargaud, M., et al. (Eds.) Encyclopedia of Astrobiology, Part 19. Springer, 1505-1506. [3] Stamenkovic, V., Höink, T., Lenardic, T. (2016) JGR Planets, 121, 1–20. [4] Stamenkovic, V., Seager, S. (2016), The Astrophysical Journal, 825, 78-95. [5] Michalakes, J., J. Dudhia, D. Gill, T. Henderson, J. Klemp, W. Skamarock, and W. Wang (2004) Proceedings of the 11th ECMWF Workshop on the Use of High Performance Computing In Meteorology, edited by G. Mozdzynski, 156–168. [6] Skamarock, W. C., J. B. Klemp, J. Dudhia, D. O. Gill, D. M. Barker, W. Wang, and J. G. Powers (2005) NCAR Tech. Note 468+STR, Natl. Cent. for Atmos. Res., Boulder, Colo. [7] Skamarock, W. C., and J. B. Klemp (2008) J. Comp. Phys., 227, 3465–3485. [8] Richardson, M. I., A. D. Toigo, and C. E. Newman (2007) J. Geophys. Res., 112.

Additional Information. This work has been supported through a “Simons Collaboration on the Origins of Life” fellowship (338555, VS).