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dc.contributor.authorCook, Claire W.
dc.contributor.authorBramson, Ali M.
dc.contributor.authorByrne, Shane
dc.contributor.authorHolt, John W.
dc.contributor.authorChristoffersen, Michael S.
dc.contributor.authorViola, Donna
dc.contributor.authorDundas, Colin M.
dc.contributor.authorGoudge, Timothy A.
dc.date.accessioned2020-07-14T20:08:53Z
dc.date.available2020-07-14T20:08:53Z
dc.date.issued2020-09-15
dc.identifier.citationCook, C. W., Bramson, A. M., Byrne, S., Holt, J. W., Christoffersen, M. S., Viola, D., ... & Goudge, T. A. (2020). Sparse subsurface radar reflectors in Hellas Planitia, Mars. Icarus, 113847. https://doi.org/10.1016/j.icarus.2020.113847en_US
dc.identifier.issn0019-1035
dc.identifier.doi10.1016/j.icarus.2020.113847
dc.identifier.urihttp://hdl.handle.net/10150/641851
dc.description.abstractGeomorphological features potentially related to subsurface ice, such as scalloped depressions, expanded craters, pedestal craters, and banded terrain, are present in and around Hellas Planitia, Mars. We present a radar survey of the region using the Shallow Radar (SHARAD) instrument on board the Mars Reconnaissance Orbiter (MRO) to identify candidate subsurface reflectors that may be due to the presence of potentially ice-rich deposits. We found that the majority of radar returns are likely from off-nadir surface topography ("clutter"), arising from the rough topography of the region. There is no widespread radar return from any subsurface interfaces. However, we identify a group of six reflectors adjacent to each other on a plateau in Malea Patera in which we have higher confidence. Landforms associated with a likely ice-rich mantle are associated with the plateau, but the thickness of this mantle does not correspond to the expected depth of the reflectors. However, layers beneath the mantle and marginal pitting at the edge of the plateau are similar to those associated with pedestal craters, which may be ice rich and are a similar thickness to the expected depth of the reflectors. Malea Patera has been interpreted to be a volcanic caldera, so the reflectors may be associated with a volcanic deposit within the plateau, although the evidence for this is inconclusive. Because this radar detection is localized and its origin ambiguous, we cannot use it to make conclusions about the thickness of subsurface deposits in the Hellas region as a whole. The lack of widespread radar reflectors in this region, as compared to the northern mid-latitudes where extensive radar reflections have been mapped, may be due in part to higher surface roughness, which creates radar clutter that may obscure subsurface reflectors. However on the southern rim of the basin and south of the basin, the lack of reflectors may indicate that the possible ice-rich deposits observed geomorphologically in this region are too thin to be resolved by SHARAD, are dielectrically similar to the underlying unit, or have a gradual vertical transition in ice content that is not reflective for the radar. This would imply that recent climate processes may have favored widespread, thick ice deposition or preservation in the northern hemisphere as compared to the southern hemisphere.en_US
dc.language.isoenen_US
dc.publisherACADEMIC PRESS INC ELSEVIER SCIENCEen_US
dc.rights© 2020 Elsevier Inc. All rights reserved.en_US
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectSpace and Planetary Scienceen_US
dc.subjectAstronomy and Astrophysicsen_US
dc.titleSparse subsurface radar reflectors in Hellas Planitia, Marsen_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Lunar & Planetary Laben_US
dc.identifier.journalICARUSen_US
dc.description.note24 month embargo; published online: 12 May 2020en_US
dc.description.collectioninformationThis 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.en_US
dc.eprint.versionFinal accepted manuscripten_US
dc.identifier.piiS0019103520302281
dc.source.journaltitleIcarus
dc.source.volume348
dc.source.beginpage113847


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