Seasonal Flows on Warm Martian Slopes

@article{McEwen2011SeasonalFO,
  title={Seasonal Flows on Warm Martian Slopes},
  author={A. McEwen and L. Ojha and C. Dundas and S. Mattson and S. Byrne and J. Wray and S. Cull and S. Murchie and N. Thomas and V. Gulick},
  journal={Science},
  year={2011},
  volume={333},
  pages={740 - 743}
}
Rare meter-scale slope features on Mars might be explained by transient flows of liquid salty water. Water probably flowed across ancient Mars, but whether it ever exists as a liquid on the surface today remains debatable. Recurring slope lineae (RSL) are narrow (0.5 to 5 meters), relatively dark markings on steep (25° to 40°) slopes; repeat images from the Mars Reconnaissance Orbiter High Resolution Imaging Science Experiment show them to appear and incrementally grow during warm seasons and… Expand

Topics from this paper

Formation of recurring slope lineae by liquid brines on present‐day Mars
[1] Recurring Slope Lineae (RSL) are small scale seasonal flow features identified by Mars Reconnaissance Orbiter that present several interesting characteristics such as an albedo contrast, seasonalExpand
Recurring slope lineae in equatorial regions of Mars
The presence of liquid water is a requirement of habitability on a planet. Possible indicators of liquid surface water on Mars include intermittent flow-like features observed on sloping terrains.Expand
Water budgets of martian recurring slope lineae
Abstract Flowing water, possibly brine, has been suggested to cause seasonally reappearing, incrementally growing, dark streaks on steep, warm slopes on Mars. We modeled these Recurring Slope LineaeExpand
The water content of recurring slope lineae on Mars
Observations of recurring slope lineae (RSL) from the High-Resolution Imaging Science Experiment have been interpreted as present-day, seasonally variable liquid water flows; however, orbitalExpand
Granular flows at recurring slope lineae on Mars indicate a limited role for liquid water
Recent liquid water flow on Mars has been proposed based on geomorphological features, such as gullies. Recurring slope lineae — seasonal flows that are darker than their surroundings — are candidateExpand
Observations and modeling of northern mid-latitude recurring slope lineae (RSL) suggest recharge by a present-day martian briny aquifer
Abstract Recurring slope lineae (RSL) are narrow (0.5–5 m) dark features on Mars that incrementally lengthen down steep slopes, fade in colder seasons, and recur annually. These features have beenExpand
Implications for the origin and evolution of Martian Recurring Slope Lineae at Hale crater from CaSSIS observations
Recurring Slope Lineae (RSL) are narrow, dark features that typically source from rocky outcrops, incrementally lengthen down Martian steep slopes in warm seasons, fade in cold seasons and recurExpand
New observations of martian southern mid-latitude recurring slope lineae (RSL) imply formation by freshwater subsurface flows
Abstract Southern mid-latitude (SML) recurring slope lineae (RSL) are narrow (0.5–5 m) dark albedo features that emanate from bedrock and incrementally lengthen down steep slopes that preferentiallyExpand
A deep groundwater origin for recurring slope lineae on Mars
TLDR
Observations and heat-flow modelling suggest that briny groundwater surfacing from fractures forms recurring slope lineae on Mars, and it is suggested that deep groundwater occasionally surfaces on Mars in present-day conditions. Expand
Melt-water formed dark streaks on slopes of Haughton crater as possible Mars analogues
Abstract Haughton crater in the Canadian Arctic has been extensively used as a Mars (and lunar) analogue over the past 20 years. Here we report on small scale, dark, semi-seasonal slope streaksExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 69 REFERENCES
Indications of brine related local seepage phenomena on the northern hemisphere of Mars
Abstract Springtime low albedo features, called Dark Dune Spots, on the seasonal frost covered dunes on Mars between 77°N and 84°N latitude have been analyzed. Two groups of these spots have beenExpand
Martian Slope Streaks Form Sporadically Throughout the Year
Introduction: Slope streaks are dark mass movements on Martian slopes, which occur only in areas of low thermal inertia and at low latitudes [1,2]. They first emerge as bold, elongated streaks, whichExpand
Present-Day Impact Cratering Rate and Contemporary Gully Activity on Mars
TLDR
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. Expand
Seasonal Erosion and Restoration of Mars’ Northern Polar Dunes
TLDR
It is shown that martian dunes are subject to an additional modification process not found on Earth: springtime sublimation of Mars’ CO2 seasonal polar caps. Expand
Subsurface ice on Mars with rough topography
High-latitude ground ice on Mars discovered by the Gamma Ray Spectrometer suite is thought to be thermally stable owing to the presence of vapor in the Martian atmosphere. However, local slopes canExpand
The role of the wind-transported dust in slope streaks activity: Evidence from the HRSC data
Abstract Slope streaks are gravity-driven albedo features observed on martian slopes since the Viking missions. The debated mechanism of formation could involve alternatively dry granular flow or wetExpand
Slope streaks on Mars: A new “wet” mechanism
Slope steaks are one of the most intriguing modern phenomena observed on Mars. They have been mostly interpreted as some specific type of granular flow. We propose another mechanism for slope streakExpand
Examination of gully sites on Mars with the shallow radar
[1] Martian gullies, found on steep slopes along broad mid-latitudinal bands, have morphologies resembling those of water-carved gullies on Earth and have been dated to <10 Ma. As such, one of theExpand
Dynamic temperature fields under Mars landing sites and implications for supporting microbial life.
TLDR
Thermal modeling has shown that 253 K is reached beneath the surface at diurnal peak heating for at least some parts of the year at each of these landing sites, which corresponds to the minimum found for specific terrestrial microorganisms. Expand
New and recent gully activity on Mars as seen by HiRISE
[1] Fresh-appearing gully deposits are found at tens of sites in the southern hemisphere of Mars. These deposits have latitudinal and azimuthal dependences similar to the overall preferences ofExpand
...
1
2
3
4
5
...