Probing the Atmospheric Cl Isotopic Ratio on Mars: Implications for Planetary Evolution and Atmospheric Chemistry

Journal
Date Issued
2021
Author(s)
Liuzzi, Giuliano
•
Villanueva, Geronimo L.
•
Viscardy, Sebastien
•
Mège, Daniel
•
Crismani, Matteo M. J.
•
Aoki, Shohei
•
Gurgurewicz, Joanna
•
Tesson, Pierre-Antoine
•
Mumma, Michael J.
•
Smith, Michael D.
•
Faggi, Sara
•
Kofman, Vincent
•
Knutsen, Elise W.
•
Daerden, Frank
•
Neary, Lori
•
Schmidt, Frédéric
•
Trompet, Loïc.
•
Erwin, Justin T.
•
Robert, Séverine
•
Thomas, Ian R.
•
Ristic, Bojan
•
•
Lopez-Moreno, Jóse Juan
•
Patel, Manish R.
•
Vandaele, Ann Carine
DOI
Abstract
Following the recent detection of HCl in the atmosphere of Mars by ExoMars/Trace Gas Orbiter, we present here the first measurement of the 37Cl/35Cl isotopic ratio in the Martian atmosphere using a set of Nadir Occultation for MArs Discovery (NOMAD) observations. We determine an isotopic anomaly of −6 ± 78‰ compared to Earth standard, consistent with the −51‰-−1‰ measured on Mars' surface by Curiosity. The measured isotopic ratio is also consistent with surface measurements, and suggests that Cl reservoirs may have undergone limited processing since formation in the Solar Nebula. The examination of possible sources and sinks of HCl shows only limited pathways to short term efficient Cl fractionation and many plausible reservoirs of "light" Cl.
Volume
48
Issue
9
Start page
e92650
Uri
Url
Issn Identifier
0094-8276
Ads BibCode
2021GeoRL..4892650L
Rights
open.access
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