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Martian slope streaks as plausible indicators of transient water activity
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Rymdteknik.ORCID-id: 0000-0002-2502-6384
Institut für Kartographie, Technische Universität Dresden.
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Rymdteknik.ORCID-id: 0000-0001-6479-2236
Luleå tekniska universitet, Institutionen för system- och rymdteknik, Rymdteknik.ORCID-id: 0000-0002-4492-9650
Vise andre og tillknytning
2017 (engelsk)Inngår i: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, nr 1, 7074Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Slope streaks have been frequently observed in the equatorial, low thermal inertia and dusty regions of Mars. The reason behind their formation remains unclear with proposed hypotheses for both dry and wet mechanisms. Here, we report an up-to-date distribution and morphometric investigation of Martian slope streaks. We find: (i) a remarkable coexistence of the slope streak distribution with the regions on Mars with high abundances of water-equivalent hydrogen, chlorine, and iron; (ii) favourable thermodynamic conditions for transient deliquescence and brine development in the slope streak regions; (iii) a significant concurrence of slope streak distribution with the regions of enhanced atmospheric water vapour concentration, thus suggestive of a present-day regolith-atmosphere water cycle; and (iv) terrain preferences and flow patterns supporting a wet mechanism for slope streaks. These results suggest a strong local regolith-atmosphere water coupling in the slope streak regions that leads to the formation of these fluidised features. Our conclusions can have profound astrobiological, habitability, environmental, and planetary protection implications

sted, utgiver, år, opplag, sider
Nature Publishing Group, 2017. Vol. 7, nr 1, 7074
HSV kategori
Forskningsprogram
Atmosfärsvetenskap
Identifikatorer
URN: urn:nbn:se:ltu:diva-64991DOI: 10.1038/s41598-017-07453-9ISI: 000406764200106PubMedID: 28765566Scopus ID: 2-s2.0-85026747795OAI: oai:DiVA.org:ltu-64991DiVA: diva2:1130547
Merknad

Validerad;2017;Nivå 2;2017-08-15 (andbra)

Tilgjengelig fra: 2017-08-10 Laget: 2017-08-10 Sist oppdatert: 2017-10-24bibliografisk kontrollert

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Forlagets fulltekstPubMedScopushttps://www.nature.com/articles/s41598-017-07453-9

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Bhardwaj, AnshumanMartin-Torres, JavierZorzano Mier, Maria-PazFonseca, Ricardo
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