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    Radar Sounding of Open Basin Lakes on Mars

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    Author
    Shoemaker, E. S.
    Baker, D. M. H.
    Carter, L. M.
    Affiliation
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2018-06
    Keywords
    Mars
    open basin lakes
    Shallow Radar (SHARAD)
    radar
    roughness
    landing sites
    
    Metadata
    Show full item record
    Publisher
    AMER GEOPHYSICAL UNION
    Citation
    Shoemaker, E. S., Baker, D. M. H., & Carter, L. M. (2018). Radar sounding of open basin lakes on Mars. Journal of Geophysical Research: Planets, 123, 1395–1406. https://doi.org/10.1029/2018JE005591
    Journal
    JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
    Rights
    © 2018. American Geophysical Union. All Rights Reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Orbital observations of the surface of Mars indicate that ancient basins were once host to lakes that may have been depocenters of sedimentary materials, including hydrated minerals like phyllosilicates. Later volcanic and sedimentary resurfacing may have developed a stratigraphy within the basins detectable through radar sounding data from the Shallow Radar instrument. Our radar survey of 61 open basin lakes (OBLs) revealed only one plausible reflector in a single basin east of Hellas Planitia. We investigated possible factors contributing to lack of radar detections in the other basins through detailed analysis of radargrams and subsurface characteristics of OBLs. As possible hosts to previous habitable environments, OBLs on Mars are important sites for future robotic and human missions. A full understanding of the factors influencing the radar signal, as addressed here, is important for more fully characterizing the subsurface structure and geology at these locations. Plain Language Summary Mars was once host to ancient lakes that can currently be observed as a topographic depression in the surface with channels where water is thought to have once flowed called an open basin lake. This flowing water transported sediments into the lake which was later covered by further sedimentary or volcanic deposits. The interface between layers of material in the subsurface can be detected from orbit using the Shallow Radar instrument. Our survey of 61 open basin lakes revealed only one detectable interface in a single basin lake. We investigate possible factors that could contribute to the lack of identified interfaces through detailed analyses of available radar images and surface characteristics of the open basin lakes. We develop a method to characterize the degree of noise (clutter) in the radar images created by large surface features (>100m) up to 25km away from the position of the ground track of the spacecraft. However, this alone cannot explain the lack of detected interfaces. A rough subsurface or interface may be more likely. Further modeling will be necessary to characterize the radar characteristics of these basins as many are landing site candidates for future missions searching for formerly habitable environments.
    Note
    6 month embargo; published online: 17 May 2018
    ISSN
    21699097
    DOI
    10.1029/2018JE005591
    Version
    Final published version
    Sponsors
    Maryland Space Grant Consortium [NNX15AJ21H]; NASA Postdoctoral Program
    Additional Links
    http://doi.wiley.com/10.1029/2018JE005591
    ae974a485f413a2113503eed53cd6c53
    10.1029/2018JE005591
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