Difference between revisions of "Glaciers on Mars"

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* [[Periodic climate changes on Mars]]
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* [[Tharsis quadrangle]]
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* [[Water]]

Revision as of 07:50, 10 October 2018

Article written by Jim Secosky. Jim is a retired science teacher who has used the Hubble Space Telescope, the Mars Global Surveyor, and HiRISE. Since the 60’s, as our spacecraft have studied Mars with more and more advanced cameras and other instruments, we have found more and more evidence for glaciers. [1] [2] [3] [4] [5] [6] [7] On Mars these glaciers are covered with rock and dust debris a few meters to a few tens of meters thick. Although Mars today seems too dry for any glaciers, this covering material has protected the underlying ice. [8] One would think that under today’s conditions any exposed ice would undergo sublimation and disappear into the thin Martian atmosphere. That is, it would go directly from a solid to a gas. This does not happen because of the isolating effect of surface material. [5] [8] [9] [10]

Water for Future Colonists

The discovery of ice on Mars is important because future colonists may be able to tap the ice for water. Besides the obvious uses of water to humans, water can be broken down with electricity to form hydrogen and oxygen. Hence, people living on Mars could be supplied with oxygen to breathe and hydrogen for fuel. We have known that the ice caps, called the polar layered deposits, contain ice, but they are far away from where it is easy to land rockets. Glaciers on the planet are much closer to the equator and widespread about the planet. Perhaps, the task of obtaining water will be done with automated machines. Already scientists here on Earth are building devices that can drill into the ground and melt any ice for water.[11] [12] Recent studies have sought to determine the nature of these covering layers to find out how best to extract water.[13] Our advanced cameras on satellites orbiting the Red Planet have mapped the exact locations of hundreds of glaciers and glacier-like features that may all contain useable ice. We know where the water is! From early on, images from satellites have shown features that resembled glaciers on the Earth. Of particular significance was the angle at the end of the glacier. The angle was far steeper than geologic features like landslides. Large stretches of landscape called “fretted terrain,” after the forehead of someone who worries or frets shows signs of glacier activity. This terrain is characterized by wide, flat floored valleys surrounded by steep cliffs. The floors contained lines in early Viking photographs.[14] Many isolated mesas are present. Furthermore, mesas are surrounded by wide aprons of material that today we know to be debris covered glaciers.

  • Alpine glacier moving from a valley Lat: 42.2° N Long: 50.5° . Note how it spreads out when leaving the valley.

  • Glacier in Greenland


Real Glaciers

With better cameras, it was observed that some mesas had what resembled glaciers in the valleys. A big advance in understanding Martian geology came when the Mars Orbiter Laser Altimeter (MOLA) on Mars Global Surveyor gave us exact elevations for the whole planet; therefore, we could figure out slopes. Where the land was tilted, the glacier-forms moved down slope. Also, researchers observed that when the glacier left the valley and reached a wider, flatter place, it spread out, just as glaciers on Earth do. In some craters there are large glaciers shaped like giant tongues, so they have been called tongue-shaped glaciers. [15]

Glacier shaped like a giant tongue, as seen by HiRISE under HiWish program
Wide view from Mars pathfinder, showing Sojourner Rover

File:Tongueismenius.jpg|Glacier shaped like a giant tongue, as seen by HiRISE under HiWish program

Lobate Debris Aprons

So for sure many things look like glaciers, but looks can be deceiving. Conclusive proof came after radar studies confirmed that many of these features were actually ice with only a thin surface covering. Shallow Subsurface Radar (SHARD) was the radar system on board the Mars Reconnaissance Orbiter that was used. It found that features, called lobate debris aprons (LDA’s), around mesas were actually glaciers, as had long been expected. [16] [17] Ice was found both in the southern hemisphere [18] [19] [20] [3] Cite error: Invalid <ref> tag; invalid names, e.g. too many [21] [22] It covers many of the wide, flat valley floors of fretted terrain. Probably formed from the interaction of glaciers coming out of valleys and of mesas eroding, it has similar surface appearance of other supposed glaciers, including LDA. It looks like the human brain. Since the material covering ice is shaped into something resembling the human brain, it is named brain terrain. Two types, open and closed have been identified. The closed still holds an ice core. Brain terrain starts to form with cracks in the ice-rich surface. Sublimation along the cracks turns the cracks into small valleys. Regions called Nilosyrtis Mensae, Protonilus Mensae and Deuteronilus Mensae display many examples of LVF. The Ismenius Lacus quadrangle and Hellas quadrangle contain many valleys exhibiting lineated valley fill.Cite error: Closing </ref> missing for <ref> tag [23] [24] [25] [26] [27] [28]

  • Wide view of Lineated Valley Fill

  • Close view of Lineated Valley Fill The location is the Ismenius Lacus quadrangle.

  • Close view of brain terrain Brain terrain covers many types of Martian glaciers.

  • Closed cell brain terrain still contains a core of ice. When the ice leaves it becomes open cell brain terrain.

Concentric Crater Fill

Concentric crater fill (CCF) is a third easily identifiable landscape that is covered with brain terrain and loaded with water. Craters with CCF are shallow. Even though they started out with a deep bowl shape, today they are full. We know how deep the crater was when formed because crater studies have found a relationship between the diameter of a crater and its original depth. These craters may be big, but they are shallow. Scientists believe they are full of dust and ice. As material moves down crater walls toward the center, concentric lines of brain terrain are created. [29] [30] [31] [32] [33]

  • Concentric Crater Fill, as seen by CTX This crater was bowl shaped when formed; now it is full of ice and dust .

  • The depth of craters can be predicted based upon the observed diameter. Many craters are almost full, instead of having bowl shape; consequently, it is believed that they have added ice, dust, and other debris since they were formed.

Source of Ice

Multiple studies imply there is plenty of ice on Mars. Ice is abundant from about 30 degrees latitude up to the poles. [34] [35] How did it get there? It is now widely believed that snow and ice-coated dust drops from the sky when the climate of Mars changes--as it frequently does. [36] [37] Calculations reveal that the tilt of Mars drastically changes due to the lack of a large moon to stabilize it. When the tilt changes, the climate changes. At times, the ice in the polar deposits leaves and goes to mid-latitudes.[38] [39] During this time ice in the cap sublimates, and thick snow falls in mid-latitudes — the zones where concentric crater fill, lineated valley fill and lobate debris aprons are common.[40] [41] [42] [43] It is deposited as something called latitude dependent mantle. Over time, some ice disappears and leaves a covering lag deposit that prevents further loss of ice. [44] [44] [45] Also, dust and other debris collect on the surface. Together, these coverings help to build up an ice-rich, long lasting smooth mantle that can eventually generate glaciers. If it gets thick enough, the ice mass will be pulled downhill by gravity. On Earth, glaciers often melt at the base. The resulting water helps the glacier slide. However, glaciers also move from internal movement of ice crystals sliding over each other. It flows like a soft plastic.[46] [47] This plastic movement will not change the shape of the ground under the glacier; however, the glacier will still carry debris and make structures called moraine.

  • Latitude dependent mantle

  • Glacier that has lost much of its ice, but has built moraines

  • Old Glacier with multiple moraines indicated with arrows When the glacier retreated it stopped at times and left behind a moraine. Material is still transported to the end (snout) of a glacier when it is not advancing.

Moraines are common on Mars. [48] It is believed that most glaciers on Mars are “cold based” that is they do not melt. Remember, under current conditions ice does not melt, rather it changes directly to a gas in a process called sublimation. We do not know if any ice melted in the past. We may understand the situation much better after the InSight spacecraft lands on Mars at the end of November 2018. InSight will measure the heat flow. A combination of high heat flow and pressure from thick ice, may have generated sufficient heat to cause some melting.

Labeled drawing of InSight Lander

File:PIA17358-MarsInSightLander-20140326.jpg|Labeled drawing of InSight Lander

Other Possible Glaciers

Besides features that look like terrestrial glaciers, LDM, LVF, and CCF; there are other shapes that may be glaciers. [49] [50] [51] [52] They appear as curved ridges and have been called various names by different researchers. Some of the names are Viscus Flow Features (VFF), arcuate ridges, Glacial-like Flows (GLF), Glacier-like Forms (GLF), and Moraine-like Ridges (MLR). [53] [54] [55] [56] [56] Most lie in impact craters. Gullies are associated with many of them. These curved ridges may be created as snow and ice accumulate high on crater walls until gravity pulls them down. As they slide down, they may push material into ridges.

  • Gullies and ridges that may be the remains of old glaciers Glaciers may have dropped moraine debris or pushed floor material into ridges.

  • Ridge downslope from a gully This ridge in a crater may be created by a glacier.

Glaciers on Volcanoes

Most major Martian volcanoes display evidence of past glaciation. [57] [58] [59] [60] [61] [62] Pavonis Mons,[63] [64] Scientists see evidence that glaciers exist on many of the volcanoes in Tharsis, including Olympus Mons, Ascraeus Mons, and Pavonis Mons. [65] [66] ref>{{cite journal | last1= Plaut | first1= Jeffrey J. | last2= Safaeinili | first2= Ali | last3= Holt | first3= John W. | last4= Phillips | first4= Roger J. | last5= Head | first5= James W. | last6= Seu | first6= Roberto | last7= Putzig | first7= Nathaniel E. | last8= Frigeri | first8= Alessandro | title= Radar Evidence for Ice in Lobate Debris Aprons in the Mid-Northern Latitudes of Mars | journal= Geophysical Research Letters | volume= 36 | issue= 2 | pages= | year= 2009 | doi = 10.1029/2008GL036379 |url=http://www.lpi.usra.edu/meetings/lpsc2008/pdf/2290.pdf | format=PDF |</ref> [67]Many large mountains on Earth also have glaciers. It is cold on mountain tops. Snow often falls heavily there; therefore, one would expect glaciers on Martian volcanoes.

Vast Ice Sheets

Besides smaller glaciers around mesas, in craters, and on mountains, Mars may have had giant ice sheets, twice the area of the state of Texas.[68] [69] [70] [71] [72] Some researchers have estimated that one ice sheet was nearly a mile thick. Near the South Pole in the Dorsa Argentea Formation are tangles of ridges that resemble what is left from streams under glaciers. These are called eskers. In the same general area are shapes, now named Sisyphi Montes, that look like what is formed on Earth when volcanoes erupt under glaciers; they have steep walls and flat tops.[73] [74] </ref> [75] These features are common in Iceland. Earlier studies support the idea that glaciers on Mars may have been much thicker and more extensive in the past. It appears in many places that LVF has dropped, probably because it has lost ice.[76] [77] [78] [79]

References

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  49. ↑ Head, J. and D. Marchant. 2006. Evidence for global-scale northern mid-latitude glaciation in the Amazonian period of Mars: Debris-covered glacial and valley glacial deposits in the 30 - 50 N latitude band. Lunar. Planet. Sci. 37. Abstract 1127
  50. ↑ Head, J. and D. Marchant. 2006. Modifications of the walls of a Noachian crater in Northern Arabia Terra (24 E, 39 N) during northern mid-latitude Amazonian glacial epochs on Mars: Nature and evolution of Lobate Debris Aprons and their relationships to lineated valley fill and glacial systems. Lunar. Planet. Sci. 37. Abstract 1128
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  52. ↑ Head, J., et al. 2006. Modification if the dichotomy boundary on Mars by Amazonian mid-latitude regional glaciation. Geophys. Res Lett. 33
  53. ↑ Milliken, R., et al. 2003. Viscous flow features on the surface of Mars: Observations from high-resolution Mars Orbiter Camera (MOC) images. Journal of Geophysical Research: 108. Doi:10.1029/2002JE002005
  54. ↑ Berman, D., et al. 2005. The role of arcuate ridges and gullies in the degradation of craters in the Newton Basin regions of Mars. Icarus: 178, 465-486.
  55. ↑ cite journal | last1 = Arfstrom | first1 = J | last2 = Hartmann | first2 = W. | year = 2005 | title = Martian flow features, moraine-like ridges, and gullies: Terrestrial analogs and interrelationships | url = | journal = Icarus | volume = 174 | issue = | pages = 321–335 | doi=10.1016/j.icarus.2004.05.026 |
  56. ↑ 56.0 56.1 cite journal | last1 = Hubbard | first1 = B. | last2 = Milliken | first2 = R. | last3 = Kargel | first3 = J. | last4 = Limaye | first4 = A. | last5 = Souness | first5 = C. | year = 2011 | title = Geomorphological characterisation and interpretation of a mid-latitude glacier-like form: Hellas Planitia, Mars | url = | journal = Icarus | volume = 211 | issue = | pages = 330–346 | doi=10.1016/j.icarus.2010.10.021 |
  57. ↑ cite journal | last1 = Head | first1 = J. W. | display-authors = 1 | last2 = et al | year = 2005 | title = Tropical to mid-latitude snow and ice accumulation, flow and glaciation on Mars | url = | journal = Nature | volume = 434 | issue = 7031| pages = 346–351 | doi=10.1038/nature03359 | pmid=15772652|
  58. ↑ cite journal | last1 = Shean | first1 = David E. | title = Origin and evolution of a cold-based tropical mountain glacier on Mars: The Pavonis Mons fan-shaped deposit | journal=Journal of Geophysical Research | volume = 110 | date = 2005 | doi = 10.1029/2004JE002360 |
  59. ↑ cite journal | last1 = Head | first1 = James W. | last2 = Marchant | first2 = David R. | year = 2003 | title = Cold-based mountain glaciers on Mars: western Arsia Mons | url = | journal = Geology | volume = 31 | issue = 7| pages = 641–644 | doi=10.1130/0091-7613(2003)031<0641:cmgomw>2.0.co;2|
  60. ↑ Cite journal|author=Hauber, E. |date=2005 |title=Discovery of a flank caldera and very young glacial activity at Hecates Tholus, Mars |journal=Nature |volume=434 |pages=356–61|pmid=15772654|issue=7031|doi=10.1038/nature03423 |last2=Van Gasselt |first2=Stephan |last3=Ivanov |first3=Boris |last4=Werner |first4=Stephanie |last5=Head |first5=James W. |last6=Neukum |first6=Gerhard |last7=Jaumann |first7=Ralf |last8=Greeley |first8=Ronald |last9=Mitchell |first9=Karl L. |last10=Muller |first10=Peter |last11=Co-Investigator Team |first11=The Hrsc
  61. ↑ Scanlon, K., J. Head, D. Marchant. 2015. REMNANT BURIED ICE IN THE ARSIA MONS FAN-SHAPED DEPOSIT, MARS. 46th Lunar and Planetary Science Conference. 2266.pdf
  62. ↑ {{cite journal | last1= Shean | first1= David E. | last2= Head | first2= James W. | last3= Fastook | first3= James L. | last4= Marchant | first4= David R. | title= Recent glaciation at high elevations on Arsia Mons, Mars: Implications for the formation and evolution of large tropical mountain glaciers| page= E03004 | date= 2007 | issue= E3 | volume= 112 | doi = 10.1029/2006JE002761 | journal= Journal of Geophysical Research | url=http://www.planetary.brown.edu/pdfs/3281.pdf | format = PDF |
  63. ↑ Cite journal|author=Shean, D. |display-authors=etal |date=2005 |title=Origin and evolution of a cold-based mountain glacier on Mars: The Pavonis Mons fan-shaped deposit |journal=Journal of Geophysical Research |volume=110|issue=E5 |page=E05001 | doi = 10.1029/2004JE002360 |
  64. ↑ Cite journal|author=Basilevsky, A. |date=2006 |title=Geological recent tectonic, volcanic and fluvial activity on the eastern flank of the Olympus Mons volcano, Mars |journal=Geophysical Research Letters |volume=33 |issue=13 |pages=13201, L13201 |doi=10.1029/2006GL026396 |last2=Werner |first2=S. C. |last3=Neukum |first3=G. |last4=Head |first4=J. W. |last5=Van Gasselt |first5=S. |last6=Gwinner |first6=K. |last7=Ivanov |first7=B. A.
  65. ↑ cite journal | last1=Shean | first1=David E. | title=Origin and evolution of cold-based tropical mountain glacier on Mars: the Pavonis Mons fan-shaped deposit | journal=Journal of Geophysical Research | volume=110 | year=2005 | doi= 10.1029/2004JE002360 |
  66. ↑ cite journal | last1=Fassett | first1=C | last2=Headiii | first2=J | title=Valley formation on martian volcanoes in the Hesperian: Evidence for melting of summit snowpack, caldera lake formation, drainage and erosion on Ceraunius Tholus | url=http://www.planetary.brown.edu/pdfs/3408.pdf | format=PDF | journal=Icarus | volume=189 | pages=118–135 | year=2007| doi = 10.1016/j.icarus.2006.12.021 |
  67. ↑ cite journal | title= Radar Sounding Evidence for Ice within Lobate Debris Aprons near Hellas Basin, Mid-Southern Latitudes of Mars | url=http://www.lpi.usra.edu/meetings/lpsc2008/pdf/2441.pdf | format=PDF | journal = Lunar and Planetary Science |volume=XXXIX | pages = 2441 |year=2008 |last1= Holt | first=J.W.| last2 = Safaeinili | first2 = A. | last3 = Plaut | first3 = J. J. | last4 = Young | first4 = D. A. | last5 = Head | first5 = J. W. | last6 = Phillips | first6 = R. J. | last7 = Campbell | first7 = B. A. | last8 = Carter | first8 = L. M. | last9 = Gim | first9 = Y. | last10 = Seu | first10 = R. | author11 = Sharad Team
  68. ↑ cite journal | last1 = Scanlon | first1 = K. | display-authors = 1 | last2 = et al | year = 2018 | title = | url = | journal = Icarus | volume = 299 | issue = | pages = 339–363| doi = 10.1016/j.icarus.2017.07.031
  69. ↑ Allen, C. 1979. Volcano-ice interactions on Mars. J. Geophys. Res.: Solid Earth (1978–2012), 84 (B14), 8048-8059.
  70. ↑ Howard, 1981
  71. ↑ cite journal | last1 = Kargel | first1 = J. | last2 = Strom | first2 = R. | year = 1992 | title = Ancient glaciation on mars | url = | journal = Geology | volume = 20 | issue = 1| pages = 3–7| doi = 10.1130/0091-7613(1992)020<0003:AGOM>2.3.CO;2
  72. ↑ Head, J, S. Pratt. 2001. Extensive Hesperian-aged south polar ice sheet on Mars: Evidence for massive melting and retreat, and lateral flow and pending of meltwater. J. Geophys. Res.-Planet, 106 (E6), 12275-12299.
  73. ↑ Ghatan, G.J. and J.W. Head, III. 2002. Candidate subglacial volcanoes in the south polar region of Mars: morphology, morphometry, and eruption conditions. J. Geophys. Res., 107(E7), 5048. (10.1029/2001JE001519.)
  74. ↑ Ghatan, G.J., J.W. Head, III and S. Pratt. 2003. Cavi Angusti, Mars: characterization and assessment of possible formation mechanisms. J. Geophys. Res., 108(E5), 5045. (10.1029/2002JE001972.)
  75. ↑ Head, J., L. Wilson. 2007. Heat Transfer in Volcano-Ice Interactions on Mars: Synthesis of Environments and Implications for Processes and Landforms. Annals of Glaciology. 45
  76. ↑ Dickson, J., et al. 2009. Kilometer-thick ice accumulation and glaciation in the northern mid-latitudes of Mars: Evidence for crater-filling events in the Late Amazonian at the Phlegra Montes. Earth and Planetary Letters. Doi:10.1016/j.epsl.2009.08.031
  77. ↑ Levy, J., et al. 2007. Lineated valley fill and lobate debris apron stratigraphy in Nilosyrtis Mensae, Mars: Evidence for phases of glacial modification of the dichotomy boundary. Journal of Geophysical Research: 112, E08004
  78. ↑ Head, J., et al. 2006. Modification of the dichotomy boundary on Mars by Amazonian mi-latitude regional glaciation. Geophysical Research Letters: 33, L08S03
  79. ↑ Dickson, J., et al. 2008. Late Amazonian glaciation at the dichotomy boundary on Mars: Evidence for glacial thickness maxima and multiple glacial phases. Geology: 36, 411-414.

See also

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