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Are Slope Streaks Indicative of Global‐Scale Aqueous Processes on Contemporary Mars?
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.ORCID iD: 0000-0002-2502-6384
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology. Institut für Kartographie, Technische Universität Dresden, Dresden, Germany. Department of Environmental Science, Sharda University, Greater Noida, India.ORCID iD: 0000-0003-3181-2960
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology. Instituto Andaluz de Ciencias de la Tierra (CSIC ‐ UGR), Armilla, Spain. UK Centre for Astrobiology, School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK.ORCID iD: 0000-0001-6479-2236
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology. Centro de Astrobiología (INTA-CSIC), Madrid, Spain.ORCID iD: 0000-0002-4492-9650
2019 (English)In: Reviews of geophysics, ISSN 8755-1209, E-ISSN 1944-9208, Vol. 57, no 1, p. 48-77Article in journal (Refereed) Published
Abstract [en]

Slope streaks are prevalent and intriguing dark albedo surface features on contemporary Mars. Slope streaks are readily observed in the equatorial and subequatorial dusty regolith regions with low thermal inertia. They gradually fade over decadal timescales. The proposed mechanisms for their formation vary widely based on several physicochemical and geomorphological explanations. The scientific community is divided in proposing both dry and wet mechanisms for the formation of slope streaks. Here we perform a systematic evaluation of the literature for these wet and dry mechanisms. We discuss the probable constraints on the various proposed mechanisms and provide perspectives on the plausible process driving global‐scale slope streak formation on contemporary Mars. Although per our understanding, a thorough consideration of the global distribution of slope streaks, their morphology and topography, flow characteristics, physicochemical and atmospheric coincidences, and terrestrial analogies weighs more in favor of several wet mechanisms, we acknowledge that such wet mechanisms cannot explain all the reported morphological and terrain variations of slope streaks. Thus, we suggest that explanations considering both dry and wet processes can more holistically describe all the observed morphological variations among slope streaks. We further acknowledge the constraints on the resolutions of remote sensing data and on our understanding of the Martian mineralogy, climate, and atmosphere and recommend continuous investigations in this direction using future remote sensing acquisitions and simulations. In this regard, finding more wet and dry terrestrial analogs for Martian slope streaks and studying them at high spatiotemporal resolutions can greatly improve our understanding.

Place, publisher, year, edition, pages
American Geophysical Union (AGU), 2019. Vol. 57, no 1, p. 48-77
Keywords [en]
slope streaks, water activity, Mars, formation mechanism, deliquescence
National Category
Aerospace Engineering
Research subject
Atmospheric science
Identifiers
URN: urn:nbn:se:ltu:diva-73724DOI: 10.1029/2018RG000617ISI: 000463995400003Scopus ID: 2-s2.0-85059686126OAI: oai:DiVA.org:ltu-73724DiVA, id: diva2:1306397
Note

Validerad;2019;Nivå 2;2019-04-12 (oliekm)

Available from: 2019-04-23 Created: 2019-04-23 Last updated: 2019-10-10Bibliographically approved

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Bhardwaj, AnshumanSam, LydiaMartin-Torres, JavierZorzano Mier, María-Paz

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