Multiple subglacial water bodies below the south pole of Mars unveiled by new MARSIS data

@article{Lauro2020MultipleSW,
  title={Multiple subglacial water bodies below the south pole of Mars unveiled by new MARSIS data},
  author={Sebastian Emanuel Lauro and Elena Pettinelli and Graziella Caprarelli and Luca Guallini and Angelo Pio Rossi and Elisabetta Mattei and Barbara Cosciotti and Andrea Cicchetti and Francesco Soldovieri and Marco Cartacci and Federico Di Paolo and Raffaella Noschese and Roberto Orosei},
  journal={Nature Astronomy},
  year={2020},
  volume={5},
  pages={63-70}
}
The detection of liquid water by the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) at the base of the south polar layered deposits in Ultimi Scopuli has reinvigorated the debate about the origin and stability of liquid water under present-day Martian conditions. To establish the extent of subglacial water in this region, we acquired new data, achieving extended radar coverage over the study area. Here, we present and discuss the results obtained by a new method of analysis… 
The Global Search for Liquid Water on Mars from Orbit: Current and Future Perspectives
TLDR
The present analysis clarifies that the conditions causing exceptionally strong subsurfaced echoes occur solely in the Martian polar caps, and that the detection of subsurface water under a predominantly rocky surface layer using radar sounding will require thorough electromagnetic modeling, complicated by the lack of knowledge of many subsurfaces physical parameters.
Characteristics of the Basal Interface of the Martian South Polar Layered Deposits
We expand on previous studies of the South Polar Layered Deposits' (SPLD) basal interface using data acquired by the Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) to obtain
GEOLOGIC CONTEXT OF THE BRIGHT MARSIS REFLECTOR IN ULTIMI SCOPULI, SOUTH POLAR LAYERED DEPOSITS, MARS
Radar-bright basal reflectors have been detected below the South Polar Layered Deposits (SPLD), data and have an exciting but controversial interpretation: liquid water from subglacial lakes. We
The Basal Detectability of an Ice‐Covered Mars by MARSIS
Introduction. The detection of anomalously strong relative basal reflectivity beneath the Martian South Polar Layered Deposits (SPLD) from the Mars Advanced Radar for Subsurface and Ionosphere
Radar sounding survey over Devon Ice Cap indicates the potential for a diverse hypersaline subglacial hydrological environment
Abstract. Prior geophysical surveys provided evidence for a hypersaline subglacial lake complex beneath the center of Devon Ice Cap, Canadian Arctic; however, the full extent and characteristics of
Explaining Bright Radar Reflections Below The Martian South Polar Layered Deposits Without Liquid Water
Introduction Recent discoveries of anomalously bright radar reflections below the Mars South Polar Layered Deposit (SPLD) have sparked new speculation that liquid water may be present below the ice
Alternatives to Liquid Water Beneath the South Polar Ice Cap of Mars
Radar sounding of Mars’ south polar ice cap has revealed portions of its base with stronger radar returns than its surface. These have been used to estimate high real permittivity values consistent
Strong MARSIS Radar Reflections From the Base of Martian South Polar Cap May Be Due to Conductive Ice or Minerals
Recent results from the Mars Advanced Radar for Subsurface and Ionosphere Sounding (MARSIS) instrument have been interpreted as evidence of subsurface brine pooled beneath 1.3 km‐thick South Polar
The Composition of the South Polar Cap of Mars Derived From Orbital Data
The flexure of the lithosphere under stresses imposed by the geologically young south polar cap is one of the few clues we have regarding the south polar cap composition and the present‐day thermal
...
...

References

SHOWING 1-10 OF 65 REFERENCES
Radar evidence of subglacial liquid water on Mars
TLDR
Radar data from Mars Express show that there is a lake of liquid water underneath the solid ice of Mars’ southern ice cap, and this feature has high relative dielectric permittivity, matching that of water-bearing materials, which is interpreted as a stable body of liquidWater on Mars.
Extensive Hesperian-aged south polar ice sheet on Mars: Evidence for massive melting and retreat, and lateral flow and ponding of meltwater
Local and regional Mars Orbiter Laser Altimeter (MOLA) topographic data support the presence of an extensive Hesperian-aged volatile-rich south polar deposit (the Dorsa Argentea Formation, Hd, and
Radar evidence of ponded subglacial water in Greenland
ABSTRACT The thermal state at the bed of a large ice sheet is a critical boundary condition governing its future evolution. Radar surveys provide an opportunity for direct but remote observation of
Evidence for subglacial ponding across Taylor Glacier, Dry Valleys, Antarctica
Abstract Ice-penetrating radar and modelling data are presented suggesting the presence of a zone of temperate ice, water ponding or saturated sediment beneath the tongue of Taylor Glacier, Dry
Water on Mars, With a Grain of Salt: Local Heat Anomalies Are Required for Basal Melting of Ice at the South Pole Today
Recent analysis of radar data from the Mars Express spacecraft has interpreted bright subsurface radar reflections as indicators of local liquid water at the base of the south polar layered deposits
Depth of the Martian cryosphere: Revised estimates and implications for the existence and detection of subpermafrost groundwater
[1] The Martian cryosphere is defined as that region of the crust where the temperature remains continuously below the freezing point of water. Previous estimates of its present thickness have ranged
Modeled Subglacial Water Flow Routing Supports Localized Intrusive Heating as a Possible Cause of Basal Melting of Mars' South Polar Ice Cap
The discovery of an ~20‐km‐wide area of bright subsurface radar reflections, interpreted as liquid water, beneath the Martian south polar layered deposits (SPLD) in data from the Mars Advanced Radar
Liquid Water Detection under the South Polar Layered Deposits of Mars - a Probabilistic Inversion Approach
TLDR
All the aspects that can affect the estimation of the basal permittivity below the Martian South polar cap are discussed and how detection of the presence of basal liquid water was done is described.
Evidence for a water system transition beneath Thwaites Glacier, West Antarctica
Thwaites Glacier is one of the largest, most rapidly changing glaciers on Earth, and its landward-sloping bed reaches the interior of the marine West Antarctic Ice Sheet, which impounds enough ice to
Density variations within the south polar layered deposits of Mars
[1] The south polar layered deposits (SPLD) constitute the largest known reservoir of water on Mars. Previous studies solved for the best fit uniform density of the deposits using a forward approach.
...
...