A Sublimation Model for Martian South Polar Ice Features

  title={A Sublimation Model for Martian South Polar Ice Features},
  author={Shane Byrne and Andrew P. Ingersoll},
  pages={1051 - 1053}
In their pioneering work, Leighton and Murray argued that the Mars atmosphere, which at present is 95% carbon dioxide, is controlled by vapor equilibrium with a much larger polar reservoir of solid carbon dioxide. Here we argue that the polar reservoir is small and cannot function as a long-term buffer to the more massive atmosphere. Our work is based on modeling of the circular depressions commonly found on the south polar cap. We argue that a carbon dioxide ice layer about 8 meters thick is… 
Perennial water ice identified in the south polar cap of Mars
This work presents the first direct identification and mapping of both carbon dioxide and water ice in the martian high southern latitudes, at a resolution of 2 km, during the local summer, when the extent of the polar ice is at its minimum.
Massive CO2 Ice Deposits Sequestered in the South Polar Layered Deposits of Mars
Shallow Radar soundings from the Mars Reconnaissance Orbiter reveal a buried deposit of carbon dioxide (CO2) ice within the south polar layered deposits of Mars with a volume of 9500 to 12,500 cubic kilometers, about 30 times that previously estimated for the south pole residual cap.
Carbon Dioxide Ice Glaciers at the South Pole of Mars
Massive, kilometer thick deposits of carbon dioxide (CO2) ice have been detected at the south polar cap of Mars by radar investigations. These deposits are divided into several units that are
Sublimation kinetics of CO2 ice on Mars
Water at the poles and in permafrost regions of mars
The poles and mid-latitudes of Mars contain abundant water in ice caps, thick sequences of ice-rich layers, and mantles of snow. The volume of the known reservoir is ≥5 x 106 km3, corresponding to a
The texture of condensed CO2 on the martian polar caps
  • M. Hecht
  • Physics, Environmental Science
  • 2008
Louth crater: Evolution of a layered water ice mound
On the mystery of the perennial carbon dioxide cap at the south pole of Mars
A perennial ice cap has long been observed near the south pole of Mars. The surface of this cap is predominantly composed of carbon dioxide ice. The retention of a CO_2 ice cap results from the
Albedo of the south pole on Mars determined by topographic forcing of atmosphere dynamics
Observations and climate modelling indicate the south pole of Mars is characterized by two distinct regional climates that are the result of dynamical forcing by the largest southern impact basins, Argyre and Hellas.


Observational Evidence for an Active Surface Reservoir of Solid Carbon Dioxide on Mars
High-resolution images of the south polar residual cap of Mars acquired in 1999 and 2001 show changes in the configuration of pits, intervening ridges, and isolated mounds that support a 35-year-old conjecture that Mars has a large surface reservoir of solid carbon dioxide.
The Instability of a South Polar Cap on Mars Composed of Carbon Dioxide
Abstract If the martian south polar cap were composed of solid carbon dioxide, would it be sufficiently stable against collapse under its own weight? This question is examined in the light of new
Mars: The case against permanent CO2 frost caps
Leighton and Murray have argued that there is a polar reservoir of solid CO_2 on Mars that lasts throughout the year and whose vapor pressure determines the mean partial pressure of CO_2 in the
Polar Volatiles on Mars—Theory versus Observation
The residual frost caps of Mars are probably water-ice and a permanent reservoir of solid CO2 is also probably present within the north residual cap, which may comprise a mass of CO2 some two to five times that of the present atmosphere of Mars.
Mars: Northern Summer Ice Cap—Water Vapor Observations from Viking 2
Observations of the latitude dependence of water vapor made from the Viking 2 orbiter show peak abundances in the latitude band 70� to 80� north in the northern midsummer season (planetocentric
Martian North Pole Summer Temperatures: Dirty Water Ice
Broadband thermal and reflectance observations of the martian north polar region in late summer yield temperatures for the residual polar cap near 205 K with albedos near 43 percent; there is no evidence for any permanent carbon dioxide polar cap.
The global topography of Mars and implications for surface evolution.
Elevations measured by the Mars Orbiter Laser Altimeter have yielded a high-accuracy global map of the topography of Mars. Dominant features include the low northern hemisphere, the Tharsis province,
Behavior of Carbon Dioxide and Other Volatiles on Mars
We have found that a rather simple thermal model of the Martian surface, in combination with current observations of the atmospheric composition, points strongly toward the conclusion that the polar
North–south geological differences between the residual polar caps on Mars
It is shown that the residual cap on the south pole is a distinct geologic unit with striking collapse and erosional topography; this is very different from the residualcap on the north pole, which grades into the underlying layered materials.