Measuring The 13c/12c In Co2 In The Lower Atmosphere Of
Mars With Nomad/Tgo: Challenges And Interpretation
G. Liuzzi, G. L. Villanueva, S. W. Stone, S. Faggi, V. Kofman, Nasa Goddard Space Flight Center, Greenbelt, Md, Usa (Gliuzzi@American.Edu), S. Aoki, Graduate School Of Frontier Sciences, The University Of Tokyo, Kashiwa, Japan, J. Alday, School Of Physical Sciences, The Open University, Milton Keynes, Uk, L.
Trompet, A. C. Vandaele, Royal Belgian Institute For Space Aeronomy, Belgium.

Introduction:
The Two Infrared Spectrometers Onboard The
Exomars Trace Gas Orbiter (Tgo) Spacecraft, The
Atmospheric Chemistry Suite (Acs) And The Nadir
And Occultation For Mars Discovery (Nomad)
Have Been Providing Observations Since April 2018
That Are A Unique Source Of Information To Unveil The
Vertical Structure Of The Atmosphere Of Mars In A Level Of Detail Never Previously Seen. In This Work, We
Focus On Understanding How The Nomad Data Can
Be Useful To Constrain The Isotopic Composition Of C
In Co2. This Has Been Measured On Several Occasions
On The Surface [1], And In Near-Surface Atmospheric
Samples [2,3], And Is Of Great Interest As Co2 Is The
Main C Reservoir In The Atmosphere Of Mars, Allowing
To Trace The History Of Atmospheric Loss And Differences With Other Inner Solar System Bodies. Additionally, Proper Characterization Of The Uncertainties Of