Abstract
Theoretical models indicate that water ice is stable in the shallow subsurface (depths of <1–2 m) of Mars at high latitudes1,2,3,4,5,6,7. These models have been mainly supported by the observed presence of large concentrations of hydrogen detected by the Gamma Ray Spectrometer suite of instruments on the Mars Odyssey spacecraft8,9,10. The models and measurements are consistent with a water-ice table that steadily increases in depth with decreasing latitude. More detailed modelling has predicted that the depth at which water ice is stable can be highly variable, owing to local surface heterogeneities such as rocks and slopes, and the thermal inertia of the ground cover11,12,13. Measurements have, however, been limited to the footprint (several hundred kilometres) of the Gamma Ray Spectrometer suite, preventing the observations from documenting more detailed water-ice distributions. Here I show that by observing the seasonal temperature response of the martian surface with the Thermal Emission Imaging System on the Mars Odyssey spacecraft14, it is possible to observe such heterogeneities at subkilometre scale. These observations show significant regional and local water-ice depth variability, and, in some cases, support distributions in the subsurface predicted by atmospheric exchange and vapour diffusion models. The presence of water ice where it follows the depth of stability under current climatic conditions implies an active martian water cycle that responds to orbit-driven climate cycles15,16,17. Several regions also have apparent deviations from the theoretical stability level, indicating that additional factors influence the ice-table depth. The high-resolution measurements show that the depth to the water-ice table is highly variable within the potential Phoenix spacecraft landing ellipses, and is likely to be variable at scales that may be sampled by the spacecraft.
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References
Leighton, R. R. & Murray, B. C. Behavior of carbon dioxide and other volatiles on Mars. Science 153, 136–144 (1966)
Fanale, F. P., Salvail, J. R., Zent, A. P. & Postawko, S. E. Global distribution and migration of subsurface ice on Mars. Icarus 67, 1–18 (1986)
Zent, A. P., Fanale, F. P., Salvail, J. R. & Postawko, S. E. Distribution and state of H2O in the high-latitude shallow subsurface of Mars. Icarus 67, 19–36 (1986)
Paige, D. A. The thermal stability of near-surface ground ice on Mars. Nature 356, 43–45 (1992)
Mellon, M. T. & Jakosky, B. M. The distribution and behavior of Martian ground ice during past and present epochs. J. Geophys. Res. 100, 11781–11799 (1995)
Jakosky, B. M., Zent, A. P. & Zurek, R. W. The Mars water cycle: Determining the role of exchange with the regolith. Icarus 130, 87–95 (1997)
Boynton, W. V. et al. Distribution of hydrogen in the near surface of Mars: Evidence for subsurface ice deposits. Science 297, 81–85 (2002)
Schorghofer, N. & Aharonson, O. Stability and exchange of subsurface ice on Mars. J. Geophys. Res. 110 E5003 doi: 10.1029/2004JE002350 (2005)
Feldman, W. C. et al. Global distribution of near-surface hydrogen on Mars. J. Geophys. Res. 109 E9006 doi: 10.1029/2003JE002160 (2004)
Mitrofanov, I. G. et al. Soil water content on Mars as estimated from neutron measurements by the HEND instrument onboard the 2001 Mars Odyssey Spacecraft. Solar Syst. Res. 38, 253–257 (2004)
Mellon, M. T., Feldman, W. C. & Prettyman, T. H. The presence and stability of ground ice in the southern hemisphere of Mars. Icarus 169, 324–340 (2004)
Sizemore, H. G. & Mellon, M. T. Effects of soil heterogeneity on martian ground-ice stability and orbital estimates of ice table depth. Icarus 185, 358–369 (2006)
Aharonson, O. & Schorghofer, N. Subsurface ice on Mars with rough topography. J. Geophys. Res. 111 E11007 doi: 10.1029/2005JE002636 (2006)
Christensen, P. R. et al. The Thermal Emission Imaging System (THEMIS) for the Mars 2001 Odyssey Mission. Space Sci. Rev. 110, 85–130 (2004)
Haberle, R. M. & Jakosky, B. M. Sublimation and transport of water from the north residual polar cap on Mars. J. Geophys. Res. 95, 1423–1437 (1990)
Jakosky, B. M., Henderson, B. G. & Mellon, M. T. Chaotic obliquity and the nature of the Martian climate. J. Geophys. Res. 100, 1579–1584 (1995)
Head, J., Mustard, J., Kreslavsky, M., Milliken, R. & Marchant, D. Recent ice ages on Mars. Nature 426, 797–802 (2003)
Edwards, C. S., Bandfield, J. L., Christensen, P. R. & Fergason, R. L. Global distribution of bedrock on Mars using THEMIS high resolution thermal inertia. Eos 158 (Fall Mtg), abstr. P21C–0158. (2005)
Betts, B. H., Murray, B. C. & Svitek, T. Thermal inertias in the upper millimeters of the Martian surface derived using Phobos’ shadow. J. Geophys. Res. 100, 5285–5296 (1995)
Kieffer, H. H. et al. Thermal and albedo mapping of Mars during the Viking primary mission. J. Geophys. Res. 82, 4249–4291 (1977)
Mellon, M. T., Jakosky, B. M., Kieffer, H. H. & Christensen, P. R. High-resolution thermal inertia mapping from the Mars Global Surveyor Thermal Emission Spectrometer. Icarus 148, 437–455 (2000)
Paige, D. A., Bachman, J. E. & Keegan, K. D. Thermal and albedo mapping of the polar regions of Mars using Viking thermal mapper observations: 1. North polar region. J. Geophys. Res. 99, 25959–25991 (1994)
Titus, T. N., Kieffer, H. H. & Christensen, P. R. Exposed water ice discovered near the south pole of Mars. Science 299, 1048–1051 (2003)
Armstrong, J. C., Titus, T. N. & Kieffer, H. H. Evidence for subsurface water ice in Korolev crater, Mars. Icarus 174, 360–372 (2005)
Titus, T. N., Prettyman, T. P. & Colaprete, A. Thermal characterization of the three proposed Phoenix landing sites. Lunar. Planet. Sci. Conf. 37, abstr. 2161. (2006)
Arvidson, R. E. et al. Overview of Mars exploration program 2007 Phoenix mission landing site selection. Lunar. Planet. Sci. Conf. 37, abstr. 1328. (2006)
Polygonal terrain in the northern plains. 〈http://marsoweb.nas.nasa.gov/HiRISE/hirise_images/TRA/TRA_000828_2495/〉 (2006)
Jakosky, B. M. et al. Mars low-latitude neutron distribution: Possible remnant near-surface water ice and a mechanism for its recent emplacement. Icarus 175, 58–67 (2005)
Bandfield, J. L., Rogers, D., Smith, M. D. & Christensen, P. R. Atmospheric correction and surface spectral unit mapping using Thermal Emission Imaging System data. J. Geophys. Res. 109 E10008 doi: 10.1029/2004JE002289 (2004)
Smith, M. D. Interannual variability in TES atmospheric observations of Mars during 1999–2003. Icarus 167, 148–165 (2004)
Acknowledgements
Thanks to P. Christensen, R. Fergason, H. Kieffer, C. Edwards, R. Luk, K. Bender, and J. Hill for data processing and targeting help and discussions.
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Bandfield, J. High-resolution subsurface water-ice distributions on Mars. Nature 447, 64–67 (2007). https://doi.org/10.1038/nature05781
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DOI: https://doi.org/10.1038/nature05781
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