Radar Sounding Evidence for Buried Glaciers in the Southern Mid-Latitudes of Mars

Holt, J. W.; Safaeinili, A.; Plaut, J. J.; Head, J. W.; Phillips, R. J.; Seu, R.; Kempf, S. D.; Choudhary, P.; Young, D. A.; Putzig, N. E.; Biccari, D.; Gim, Y.

doi:10.1126/science.1164246

Cited by 346 publications

(253 citation statements)

References 24 publications

Supporting

Mentioning

239

Contrasting

Unclassified

Order By: Relevance

“…It has 20 MHz centre frequency, 10 MHz bandwith and 15m free space horizontal resolution (Seu et al, 2007). SHARAD has been successfully used to observe complicate substructures of Mars, not only polar deposit but also the other geomorphic features involving possible subsurface ice body even including rather small scale objects such as pedestal craters (Nunes et al, 2001) and LDAs (Holt et al, 2008). Therefore, considering its better potential to extract the information on surface layering, we focused our analysis on data gathered with SHARAD rather than MARSIS though the efforts to further exploit MARSIS data are still undergoing.…”

Section: Sensormentioning

confidence: 99%

“…Recently, relatively high ice content over underlying has been already identified (Holt et al, 2008) in those target areas and proposed that at least some of them might be composed of pure ice, protected from sublimation by a thin debris cover. A modelling work assuming glacial deformation helped to reconstruct some internal structural properties (Karlsson et al, 2015).…”

Section: Introduction Of Target Objectmentioning

confidence: 99%

“…LDA, which is the target object of this study, is regarded as an evidence of potential glacial process (Holt et al, 2008) and ice debris transport in ancient Martian environment (Hauber et al, 2008). It can be characterized as alluvial-fan-like debris with tens to hundreds meters thick mass flowed from the mountain slope that was covered by glacier or periglacial landforms around some Million Years ago, estimated by crater counting .…”

Section: Introduction Of Target Objectmentioning

confidence: 99%

See 2 more Smart Citations

The Development of 3d Sub-Surface Mapping Scheme and Its Application to Martian Lobate Debris Aprons

Baik

Kim

2017

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

View full text Add to dashboard Cite

ABSTRACT:The Shallow Subsurface Radar (SHARAD), a sounding radar equipped on the Mars Reconnaissance Orbiter (MRO), has produced highly valuable information about the Martian subsurface. In particular, the complicated substructures of Mars such as polar deposit, pedestal crater and the other geomorphic features involving possible subsurface ice body has been successfully investigated by SHARAD. In this study, we established a 3D subsurface mapping strategy employing the multiple SHARAD profiles. A number of interpretation components of SHARAD signals were integrated into a subsurface mapping scheme using radargram information and topographic data, then applied over a few mid latitude Lobate Debris Aprons (LDAs). From the identified subsurface layers of LDA, and the GIS data base incorporating the other interpretation outcomes, we are expecting to trace the origin of LDAs. Also, the subsurface mapping scheme developed in this study will be further applied to other interesting Martian geological features such as inter crater structures, aeolian deposits and fluvial sediments. To achieve higher precision sub-surface mapping, the clutter simulation employing the high resolution topographic data and the upgraded clustering algorithms assuming multiple sub-surface layers will be also developed.

show abstract

Section: Sensormentioning

confidence: 99%

Section: Introduction Of Target Objectmentioning

confidence: 99%

Section: Introduction Of Target Objectmentioning

confidence: 99%

See 1 more Smart Citation

The Development of 3d Sub-Surface Mapping Scheme and Its Application to Martian Lobate Debris Aprons

Baik

Kim

2017

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

View full text Add to dashboard Cite

show abstract

“…Today, the largest quantities of water are found in the subsurface (e.g. Holt et al 2008). The specific interest in lava tubes on Earth is motivated by their presence in volcanic, basaltic environments analogous to the geological context of lava tubes on Mars (Cushing et al 2007;Williams et al 2010).…”

Section: Lava Tubes and Cavesmentioning

confidence: 99%

Earth as a Tool for Astrobiology—A European Perspective

et al. 2017

View full text Add to dashboard Cite

Scientists use the Earth as a tool for astrobiology by analyzing planetary field analogues (i.e. terrestrial samples and field sites that resemble planetary bodies in our Solar System). In addition, they expose the selected planetary field analogues in simulation chambers to conditions that mimic the ones of planets, moons and Low Earth Orbit (LEO) space conditions, as well as the chemistry occurring in interstellar and cometary ices. This paper reviews the ways the Earth is used by astrobiologists: (i) by conducting planetary field analogue studies to investigate extant life from extreme environments, its metabolisms, adaptation strategies and modern biosignatures; (ii) by conducting planetary field analogue studies to investigate extinct life from the oldest rocks on our planet and its biosignatures; (iii) by exposing terrestrial samples to simulated space or planetary environments and producing a sample analogue to investigate changes in minerals, biosignatures and microorganisms. The European Space Agency (ESA) created a topical team in 2011 to investigate recent activities using the Earth as a tool for astrobiology and to formulate recommendations and scientific needs to improve ground-based astrobiological research. Space is an important tool for astrobiology (see Horneck et al. in Astrobiology, 16:201-243, 2016;Cottin et al., 2017), but access to space is limited. Complementing research on Earth provides fast access, more replications and higher sample throughput. The major conclusions of the topical team and suggestions for the future include more scientifically qualified calls for field campaigns with planetary analogy, and a centralized point of contact at ESA or the EU for the organization of a survey of such expeditions. An improvement of the coordinated logistics, infrastructures and funding system supporting the combination of field work with planetary simulation investigations, as well as an optimization of the scientific return and data processing, data storage and data distribution is also needed. Finally, a coordinated EU or ESA education and outreach program would improve the participation of the public in the astrobiological activities.

show abstract

“…The regions between 30° north and 30° south qualified as not-so-special 2 (see map). But since then, there have been mid-latitude discoveries of buried glaciers 3 and tiny pools of ice excavated by recent asteroid impacts 4 suggesting that the non-special zone might be even smaller than currently designated.…”

Section: Tough Microbesmentioning

confidence: 99%

The planetary police

Hand¹

2009

Nature

View full text Add to dashboard Cite

Radar Sounding Evidence for Buried Glaciers in the Southern Mid-Latitudes of Mars

Cited by 346 publications

References 24 publications

The Development of 3d Sub-Surface Mapping Scheme and Its Application to Martian Lobate Debris Aprons

The Development of 3d Sub-Surface Mapping Scheme and Its Application to Martian Lobate Debris Aprons

Earth as a Tool for Astrobiology—A European Perspective

The planetary police

Contact Info

Product

Resources

About