South Pole of Mars: Nature and composition of the icy terrains from Mars Express OMEGA observations
International audience Monitoring the exchange of CO2, H2O and dust between the atmosphere, regolith, seasonal deposits and the permanent polar caps of Mars is required to study the climate of the planet and its evolution. The imaging spectrometer Observatoire pour la Minéralogie, l'Eau, les Gl...
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Online Access: | https://insu.hal.science/insu-00359317 https://doi.org/10.1016/j.pss.2006.05.035 |
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ftuniparissaclay:oai:HAL:insu-00359317v1 2024-09-15T18:36:54+00:00 South Pole of Mars: Nature and composition of the icy terrains from Mars Express OMEGA observations Douté, Sylvain Schmitt, Bernard Langevin, Y. Bibring, J.-P. Altieri, F. Bellucci, G. Gondet, B. Poulet, F. Mex Omega Team, The Laboratoire de Planétologie de Grenoble (LPG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Institut d'astrophysique spatiale (IAS) Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales Paris (CNES) Istituto di Fisica dello Spazio Interplanetario (IFSI) National Research Council of Italy 2007 https://insu.hal.science/insu-00359317 https://doi.org/10.1016/j.pss.2006.05.035 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.pss.2006.05.035 insu-00359317 https://insu.hal.science/insu-00359317 doi:10.1016/j.pss.2006.05.035 ISSN: 0032-0633 Planetary and Space Science https://insu.hal.science/insu-00359317 Planetary and Space Science, 2007, 55 (1-2), pp.113-133. ⟨10.1016/j.pss.2006.05.035⟩ Mars Polar regions Ices Imaging spectroscopy info:eu-repo/semantics/article Journal articles 2007 ftuniparissaclay https://doi.org/10.1016/j.pss.2006.05.035 2024-08-30T01:48:54Z International audience Monitoring the exchange of CO2, H2O and dust between the atmosphere, regolith, seasonal deposits and the permanent polar caps of Mars is required to study the climate of the planet and its evolution. The imaging spectrometer Observatoire pour la Minéralogie, l'Eau, les Glaces et l'Activité (OMEGA) of Mars Express contributes to such a task by regularly acquiring hyperspectral images of the polar regions in the 0.35–View the MathML source range. We analyze five OMEGA observations that were acquired over the high southern latitudes in 2004 at the end of summer (LS=335–348ring operator). We conduct statistical analyses of data as well as radiative transfer modelings of selected spectra in order to investigate the nature, distribution and properties of various icy terrains: the bright permanent polar cap (BPPC), the layered deposits (SPLD), and the seasonal accumulations of water frost (SFA). Annealed CO2 ice, potentially polycrystalline, dominates the BPPC and contains trace amounts of dust and water probably trapped in the cap during southern winter. Vast areas of the BPPC are quite homogeneous with dust and water contents of ≈0.03–0.06 and ≈0.02–0.06 wt%, respectively, but we observe larger variations for specific regions. The BPPC lays on a water-rich (View the MathML source) basement that emerges at the edges of the cap. In the circumpolar region, we observe the superficial part of the SPLD that shows a mixture of perennial H2O ice (up to View the MathML source) and dust. The SPLD are generally buried under an optically thick layer of sand or of seasonal frost accumulations. The SFA are composed of water ice (≈65–70 wt%) and dust and cover large areas at the outskirts of the BPPC or at distance from it. We also found intermediate situations (≈20 water wt%) between the SFA and the dust cover. Article in Journal/Newspaper South pole Archives ouvertes de Paris-Saclay Planetary and Space Science 55 1-2 113 133 |
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Open Polar |
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Archives ouvertes de Paris-Saclay |
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ftuniparissaclay |
language |
English |
topic |
Mars Polar regions Ices Imaging spectroscopy |
spellingShingle |
Mars Polar regions Ices Imaging spectroscopy Douté, Sylvain Schmitt, Bernard Langevin, Y. Bibring, J.-P. Altieri, F. Bellucci, G. Gondet, B. Poulet, F. Mex Omega Team, The South Pole of Mars: Nature and composition of the icy terrains from Mars Express OMEGA observations |
topic_facet |
Mars Polar regions Ices Imaging spectroscopy |
description |
International audience Monitoring the exchange of CO2, H2O and dust between the atmosphere, regolith, seasonal deposits and the permanent polar caps of Mars is required to study the climate of the planet and its evolution. The imaging spectrometer Observatoire pour la Minéralogie, l'Eau, les Glaces et l'Activité (OMEGA) of Mars Express contributes to such a task by regularly acquiring hyperspectral images of the polar regions in the 0.35–View the MathML source range. We analyze five OMEGA observations that were acquired over the high southern latitudes in 2004 at the end of summer (LS=335–348ring operator). We conduct statistical analyses of data as well as radiative transfer modelings of selected spectra in order to investigate the nature, distribution and properties of various icy terrains: the bright permanent polar cap (BPPC), the layered deposits (SPLD), and the seasonal accumulations of water frost (SFA). Annealed CO2 ice, potentially polycrystalline, dominates the BPPC and contains trace amounts of dust and water probably trapped in the cap during southern winter. Vast areas of the BPPC are quite homogeneous with dust and water contents of ≈0.03–0.06 and ≈0.02–0.06 wt%, respectively, but we observe larger variations for specific regions. The BPPC lays on a water-rich (View the MathML source) basement that emerges at the edges of the cap. In the circumpolar region, we observe the superficial part of the SPLD that shows a mixture of perennial H2O ice (up to View the MathML source) and dust. The SPLD are generally buried under an optically thick layer of sand or of seasonal frost accumulations. The SFA are composed of water ice (≈65–70 wt%) and dust and cover large areas at the outskirts of the BPPC or at distance from it. We also found intermediate situations (≈20 water wt%) between the SFA and the dust cover. |
author2 |
Laboratoire de Planétologie de Grenoble (LPG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Institut d'astrophysique spatiale (IAS) Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales Paris (CNES) Istituto di Fisica dello Spazio Interplanetario (IFSI) National Research Council of Italy |
format |
Article in Journal/Newspaper |
author |
Douté, Sylvain Schmitt, Bernard Langevin, Y. Bibring, J.-P. Altieri, F. Bellucci, G. Gondet, B. Poulet, F. Mex Omega Team, The |
author_facet |
Douté, Sylvain Schmitt, Bernard Langevin, Y. Bibring, J.-P. Altieri, F. Bellucci, G. Gondet, B. Poulet, F. Mex Omega Team, The |
author_sort |
Douté, Sylvain |
title |
South Pole of Mars: Nature and composition of the icy terrains from Mars Express OMEGA observations |
title_short |
South Pole of Mars: Nature and composition of the icy terrains from Mars Express OMEGA observations |
title_full |
South Pole of Mars: Nature and composition of the icy terrains from Mars Express OMEGA observations |
title_fullStr |
South Pole of Mars: Nature and composition of the icy terrains from Mars Express OMEGA observations |
title_full_unstemmed |
South Pole of Mars: Nature and composition of the icy terrains from Mars Express OMEGA observations |
title_sort |
south pole of mars: nature and composition of the icy terrains from mars express omega observations |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
https://insu.hal.science/insu-00359317 https://doi.org/10.1016/j.pss.2006.05.035 |
genre |
South pole |
genre_facet |
South pole |
op_source |
ISSN: 0032-0633 Planetary and Space Science https://insu.hal.science/insu-00359317 Planetary and Space Science, 2007, 55 (1-2), pp.113-133. ⟨10.1016/j.pss.2006.05.035⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.pss.2006.05.035 insu-00359317 https://insu.hal.science/insu-00359317 doi:10.1016/j.pss.2006.05.035 |
op_doi |
https://doi.org/10.1016/j.pss.2006.05.035 |
container_title |
Planetary and Space Science |
container_volume |
55 |
container_issue |
1-2 |
container_start_page |
113 |
op_container_end_page |
133 |
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1810480637494165504 |