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Perchlorate formation on Mars through surface radiolysis‐initiated atmospheric chemistry: A potential mechanism
dc.contributor.authorWilson, Eric H.
dc.contributor.authorAtreya, Sushil K.
dc.contributor.authorKaiser, Ralf I.
dc.contributor.authorMahaffy, Paul R.
dc.date.accessioned2016-10-17T21:19:02Z
dc.date.available2017-10-05T14:33:49Zen
dc.date.issued2016-08
dc.identifier.citationWilson, Eric H.; Atreya, Sushil K.; Kaiser, Ralf I.; Mahaffy, Paul R. (2016). "Perchlorate formation on Mars through surface radiolysis‐initiated atmospheric chemistry: A potential mechanism." Journal of Geophysical Research: Planets 121(8): 1472-1487.
dc.identifier.issn2169-9097
dc.identifier.issn2169-9100
dc.identifier.urihttps://hdl.handle.net/2027.42/134196
dc.description.abstractRecent observations of the Martian surface by the Phoenix lander and the Sample Analysis at Mars indicate the presence of perchlorate (ClO4–). The abundance and isotopic composition of these perchlorates suggest that the mechanisms responsible for their formation in the Martian environment may be unique in our solar system. With this in mind, we propose a potential mechanism for the production of Martian perchlorate: the radiolysis of the Martian surface by galactic cosmic rays, followed by the sublimation of chlorine oxides into the atmosphere and their subsequent synthesis to form perchloric acid (HClO4) in the atmosphere, and the surface deposition and subsequent mineralization of HClO4 in the regolith to form surface perchlorates. To evaluate the viability of this mechanism, we employ a one‐dimensional chemical model, examining chlorine chemistry in the context of Martian atmospheric chemistry. Considering the chlorine oxide, OClO, we find that an OClO flux as low as 3.2 × 107 molecules cm–2 s–1 sublimated into the atmosphere from the surface could produce sufficient HClO4 to explain the perchlorate concentration on Mars, assuming an accumulation depth of 30 cm and integrated over the Amazonian period. Radiolysis provides an efficient pathway for the oxidation of chlorine, bypassing the efficient Cl/HCl recycling mechanism that characterizes HClO4 formation mechanisms proposed for the Earth but not Mars.Key PointsMechanism initiated by radiolysis in the surface can potentially account for observed Martian perchlorate concentrationsInjection of oxides of chlorine from the surface into the atmosphere is potentially an effective way of forming perchloric acidMartian perchlorate is an important oxidant but poorly characterized
dc.publisherWiley‐Interscience
dc.subject.otherchlorine chemistry
dc.subject.otherMars
dc.subject.othersurface‐atmosphere interactions
dc.subject.otherradiolysis
dc.titlePerchlorate formation on Mars through surface radiolysis‐initiated atmospheric chemistry: A potential mechanism
dc.typeArticleen_US
dc.rights.robotsIndexNoFollow
dc.subject.hlbsecondlevelGeological Sciences
dc.subject.hlbtoplevelScience
dc.description.peerreviewedPeer Reviewed
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/134196/1/jgre20553.pdf
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/134196/2/jgre20553_am.pdf
dc.identifier.doi10.1002/2016JE005078
dc.identifier.sourceJournal of Geophysical Research: Planets
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