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

  title={Radar Sounding Evidence for Buried Glaciers in the Southern Mid-Latitudes of Mars},
  author={John W. Holt and Ali. Safaeinili and Jeffrey J. Plaut and James W. Head and Roger J. Phillips and Roberto Seu and Scott D. Kempf and Prateek Choudhary and Duncan Alexander Young and Nathaniel E. Putzig and Daniela Biccari and Yonggyu Gim},
  pages={1235 - 1238}
Lobate features abutting massifs and escarpments in the middle latitudes of Mars have been recognized in images for decades, but their true nature has been controversial, with hypotheses of origin such as ice-lubricated debris flows or glaciers covered by a layer of surface debris. These models imply an ice content ranging from minor and interstitial to massive and relatively pure. Soundings of these deposits in the eastern Hellas region by the Shallow Radar on the Mars Reconnaissance Orbiter… 
Radar evidence for ice in lobate debris aprons in the mid‐northern latitudes of Mars
Subsurface radar sounding data indicate that lobate debris aprons found in Deuteronilus Mensae in the mid‐northern latitudes of Mars are composed predominantly of water ice. The position in time
Volume of Martian midlatitude glaciers from radar observations and ice flow modeling
Numerous glacier‐like forms have been identified in the midlatitudes of Mars, and within recent years the acquisition of radar sounding data has revealed that the features are chiefly composed of
SHARAD detection and characterization of subsurface water ice deposits in Utopia Planitia, Mars
Morphological analyses of Utopia Planitia, Mars, have led to the hypothesis that the region contains a substantial amount of near‐surface ice. This paper tests this hypothesis using
SHARAD observations of recent geologic features on Mars
The Shallow Radar (SHARAD) instrument on the Mars Reconnaissance Orbiter (MRO) observes a variety of recent features on Mars, including deposits of water ice at both poles and in the mid-latitudes,
Mid-latitude glaciation on Mars
Near-surface water ice, either pure or mixed with regolith, forms a widespread suite of distinctive landforms in Mars’ mid-latitudes. These landforms are in many cases sufficiently similar to
Widespread Shallow Water Ice on Mars at High Latitudesand Midlatitudes
We derive the depth of the water ice table on Mars by fitting seasonal surface temperature trends acquired by the Mars Climate Sounder and Thermal Emission Imaging System with a two‐layer regolith
Wet-based glaciation on Mars
Mars is a glacial planet. It hosts water ice in large polar ice caps, and in thousands of ‘viscous flow features’ in its mid latitudes that are thought to be debris-covered water ice glaciers. These
Widespread excess ice in Arcadia Planitia, Mars
The distribution of subsurface water ice on Mars is a key constraint on past climate, while the volumetric concentration of buried ice (pore‐filling versus excess) provides information about the
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Mars is the only planet other than Earth in the Solar System that has a preserved nonpolar geological record of glaciation on its surface. Nonpolar ice deposits on Mars have been linked to variations
Distribution of Mid-Latitude Ground Ice on Mars from New Impact Craters
Observations of ground ice exposed by recent impact craters probe the composition of the upper layers of the surface of Mars, and derive ice-table depths that are consistent with models using higher long-term average atmospheric water vapor content than present values.


Accumulation and Erosion of Mars' South Polar Layered Deposits
The sounding radar SHARAD on the Mars Reconnaissance Orbiter mapped detailed subsurface stratigraphy in the Promethei Lingula region of the south polar plateau, Planum Australe, indicating recent erosion of ice-rich layered deposits.
Tropical to mid-latitude snow and ice accumulation, flow and glaciation on Mars
Images from the Mars Express HRSC (High-Resolution Stereo Camera) of debris aprons at the base of massifs in eastern Hellas reveal numerous concentrically ridged lobate and pitted features and
Mars North Polar Deposits: Stratigraphy, Age, and Geodynamical Response
The Shallow Radar (SHARAD) on the Mars Reconnaissance Orbiter has imaged the internal stratigraphy of the north polar layered deposits of Mars, revealing a laterally continuous deposition of layers which typically consist of four packets of finely spaced reflectors separated by homogeneous interpacket regions of nearly pure ice.
Formation of Glaciers on Mars by Atmospheric Precipitation at High Obliquity
High-resolution climate simulations performed with a model designed to simulate the present-day Mars water cycle but assuming a 45° obliquity points to an atmospheric origin for the ice and reveals how precipitation could have formed glaciers on Mars.
Subsurface Radar Sounding of the South Polar Layered Deposits of Mars
The ice-rich south polar layered deposits of Mars were probed with the Mars Advanced Radar for Subsurface and Ionospheric Sounding on the Mars Express orbiter, suggesting a composition of nearly pure water ice.
Radar Soundings of the Subsurface of Mars
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The distribution of lobate debris aprons and similar flows on Mars
Planet-wide mapping of lobate debris aprons and other similar flows on Mars shows a strong concentration in two latitudinal bands roughly 25° wide and centered at 40°N and 45°S. This distribution
Ice flow and rock glaciers on Mars
Several geologic features suggest the presence of rock glaciers on the surface of Mars. These features include lobate debris aprons, concentric crater fill and lineated valley fill. The lateral
Recent ice ages on Mars
Evidence is shown that dusty, water-ice-rich mantling deposits on Mars formed during a geologically recent ice age that occurred from about 2.1 to 0.4 Myr ago, a key pacemaker of ice ages on the Earth.