Distribution of Mid-Latitude Ground Ice on Mars from New Impact Craters

  title={Distribution of Mid-Latitude Ground Ice on Mars from New Impact Craters},
  author={Shane Byrne and Colin M. Dundas and Megan R. Kennedy and Michael T Mellon and Alfred S. McEwen and Selby C. Cull and Ingrid Justine Daubar and David E. Shean and Kimberly D. Seelos and Scott L. Murchie and Bruce A. Cantor and Raymond E. Arvidson and Kenneth S. Edgett and Andreas Reufer and Nicolas Thomas and Tanya N. Harrison and Liliya V. Posiolova and Frank P. Seelos},
  pages={1674 - 1676}
Martian Impact Impact craters form frequently on Mars, exposing material that would otherwise remain hidden below the surface. Byrne et al. (p. 1674) identified mid-latitude craters that formed over the last few years, imaged them in great detail with a camera on board the Mars Reconnaissance Orbiter, and monitored subsequent changes. The craters excavated buried water ice, which was later seen sublimating away. In addition, some craters might have excavated completely through the ice. The… 

HiRISE observations of new impact craters exposing Martian ground ice

Twenty small new impact craters or clusters have been observed to excavate bright material inferred to be ice at mid‐latitudes and high latitudes on Mars. In the northern hemisphere, the craters are

Exposed subsurface ice sheets in the Martian mid-latitudes

Cliffs on Mars expose water ice sheets present just below the surface in many locations, and the vertical structure of Martian ice-rich deposits are expected to preserve a record of ice deposition and past climate.

Geomorphological Evidence for Shallow Ice in the Southern Hemisphere of Mars

The localized loss of near‐surface excess ice on Mars by sublimation (and perhaps melting) can produce thermokarstic collapse features such as expanded craters and scalloped depressions, which can be

Widespread Exposures of Extensive Clean Shallow Ice in the Midlatitudes of Mars

Although ice in the Martian midlatitudes is typically covered by a layer of dust or regolith, it is exposed in some locations by fresh impact craters or in erosional scarps. In both cases, the



Present-Day Impact Cratering Rate and Contemporary Gully Activity on Mars

The Mars Global Surveyor Mars Orbiter Camera has acquired data that establish the present-day impact cratering rate and document new deposits formed by downslope movement of material in mid-latitude gullies on Mars, suggesting that liquid water flowed on the surface of Mars during the past decade.

Dynamics of ice ages on Mars

Simulations of the retreat and growth of ground ice as a result of sublimation loss and recharge reveal forty major ice ages over the past five million years of Mars, and how the subsurface ice sheets could have evolved to the state in which the authors see them today is explained.

The distribution and behavior of Martian ground ice during past and present epochs

Mars undergoes significant oscillations in its orbit, which will have a pronounced effect on its climate and, in particular, on the behavior of subsurface water ice. We explore and map the behavior

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

Soundings of these deposits in the eastern Hellas region by the Shallow Radar on the Mars Reconnaissance Orbiter reveal radar properties entirely consistent with massive water ice, supporting the debris-covered glacier hypothesis.

Evidence for recent climate change on Mars from the identification of youthful near-surface ground ice

Observational evidence for a mid-latitude reservoir of near-surface water ice occupying the pore space of soils is reported and it is inferred that the reservoir was created during the last phase of high orbital obliquity less than 100,000 years ago, and is now being diminished.

The thermal stability of near-surface ground ice on Mars

THE existence of subsurface water ice on Mars has been predicted in several theoretical studies1–5, but there are no definitive observations of its present distribution. Geomorphic features on the

Geomorphic Evidence for the Distribution of Ground Ice on Mars

High-resolution Viking orbiter images show evidence for quasi-viscous relaxation of topography, which suggests that ice at low latitudes has been lost via sublimation and diffusion through the regolith, thereby causing a net poleward transport of ice over martian history.

Geographic variations in the thermal and diffusive stability of ground ice on Mars

To investigate the stability of ground ice within the top several meters of the Martian regolith, time-dependent models of the thermal and diffusive behavior of the regolith have been developed. The

Response of Martian ground ice to orbit‐induced climate change

[1] Variations in the orbit and spin axis of Mars drive climate changes that affect both surface temperatures and atmospheric water content, both of which affect the distribution of ground ice. A