The Enigma of Methane on Mars - Archive ouverte HAL Access content directly
Book Sections Year : 2018

The Enigma of Methane on Mars

(1)
1
Franck Lefèvre

Abstract

Between 2004 and 2012, four independent groups reported detections of low levels (10–60 ppbv) of methane on Mars. If true, these constitute the first observations of a potential biosignature on that planet and would be an important finding and addition to the inventory of minor species in its atmosphere. However, these claims for the presence of methane have been highly controversial. In 2014, the most robust search for methane on Mars was performed by the rover Curiosity. The latest measurements by Curiosity indicate a background CH4 level of 0.2–0.7 ppbv, except during a two-month period between November 2013 and January 2014, when high mixing ratios of around 7 ppbv were observed. These observations immediately raise the question of the origin of methane on Mars, but also pose fundamental challenges to our current understanding of Martian atmospheric physics and chemistry.
Fichier principal
Vignette du fichier
methane_chapter_revised.pdf (3.36 Mo) Télécharger le fichier
Origin : Files produced by the author(s)

Dates and versions

insu-01886629 , version 1 (02-08-2021)

Identifiers

Cite

Franck Lefèvre. The Enigma of Methane on Mars. Barbara CavalazziFrances Westall (eds). Biosignatures for Astrobiology, Springer, pp.253-266, 2018, 978-3-319-96174-3. ⟨10.1007/978-3-319-96175-0_12⟩. ⟨insu-01886629⟩
193 View
27 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More