Orbital forcing of the martian polar layered deposits
International audience Since the first images of polar regions on Mars revealed alternating bright and dark layers, there has been speculation that their formation might be tied to the planet's orbital climate forcing. But uncertainties in the deposition timescale exceed two orders of magnitude...
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ftunivnantes:oai:HAL:hal-03785478v1 2023-05-15T16:38:17+02:00 Orbital forcing of the martian polar layered deposits Laskar, Jacques Levrard, Benjamin Mustard, John F. Institut de Mécanique Céleste et de Calcul des Ephémérides (IMCCE) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Lille-Centre National de la Recherche Scientifique (CNRS) Astronomie et systèmes dynamiques (ASD) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Department of Geological Science, Brown University 2002 https://hal.archives-ouvertes.fr/hal-03785478 https://doi.org/10.1038/nature01066 en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/nature01066 hal-03785478 https://hal.archives-ouvertes.fr/hal-03785478 BIBCODE: 2002Natur.419.375L doi:10.1038/nature01066 ISSN: 0028-0836 EISSN: 1476-4687 Nature https://hal.archives-ouvertes.fr/hal-03785478 Nature, 2002, 419, pp.375-377. ⟨10.1038/nature01066⟩ [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] info:eu-repo/semantics/article Journal articles 2002 ftunivnantes https://doi.org/10.1038/nature01066 2022-12-07T00:30:15Z International audience Since the first images of polar regions on Mars revealed alternating bright and dark layers, there has been speculation that their formation might be tied to the planet's orbital climate forcing. But uncertainties in the deposition timescale exceed two orders of magnitude: estimates based on assumptions of dust deposition, ice formation and sublimation, and their variations with orbital forcing suggest a deposition rate of 10 -3 to 10 -2 cmyr -1 (refs 5, 6), whereas estimates based on cratering rate result in values as high as 0.1 to 0.2cmyr -1 (ref. 7). Here we use a combination of high-resolution images of the polar layered terrains, high-resolution topography and revised calculations of the orbital and rotational parameters of Mars to show that a correlation exists between ice-layer radiance as a function of depth (obtained from photometric data of the images of the layered terrains) and the insolation variations in summer at the martian north pole, similar to what has been shown for palaeoclimate studies of the Earth. For the best fit between the radiance profile and the simulated insolation parameters, we obtain an average deposition rate of 0.05cmyr -1 for the top 250m of deposits on the ice cap of the north pole of Mars. Article in Journal/Newspaper Ice cap Université de Nantes: HAL-UNIV-NANTES North Pole Nature 419 6905 375 377 |
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Université de Nantes: HAL-UNIV-NANTES |
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English |
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[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
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[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] Laskar, Jacques Levrard, Benjamin Mustard, John F. Orbital forcing of the martian polar layered deposits |
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[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] |
description |
International audience Since the first images of polar regions on Mars revealed alternating bright and dark layers, there has been speculation that their formation might be tied to the planet's orbital climate forcing. But uncertainties in the deposition timescale exceed two orders of magnitude: estimates based on assumptions of dust deposition, ice formation and sublimation, and their variations with orbital forcing suggest a deposition rate of 10 -3 to 10 -2 cmyr -1 (refs 5, 6), whereas estimates based on cratering rate result in values as high as 0.1 to 0.2cmyr -1 (ref. 7). Here we use a combination of high-resolution images of the polar layered terrains, high-resolution topography and revised calculations of the orbital and rotational parameters of Mars to show that a correlation exists between ice-layer radiance as a function of depth (obtained from photometric data of the images of the layered terrains) and the insolation variations in summer at the martian north pole, similar to what has been shown for palaeoclimate studies of the Earth. For the best fit between the radiance profile and the simulated insolation parameters, we obtain an average deposition rate of 0.05cmyr -1 for the top 250m of deposits on the ice cap of the north pole of Mars. |
author2 |
Institut de Mécanique Céleste et de Calcul des Ephémérides (IMCCE) Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Lille-Centre National de la Recherche Scientifique (CNRS) Astronomie et systèmes dynamiques (ASD) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris Department of Geological Science, Brown University |
format |
Article in Journal/Newspaper |
author |
Laskar, Jacques Levrard, Benjamin Mustard, John F. |
author_facet |
Laskar, Jacques Levrard, Benjamin Mustard, John F. |
author_sort |
Laskar, Jacques |
title |
Orbital forcing of the martian polar layered deposits |
title_short |
Orbital forcing of the martian polar layered deposits |
title_full |
Orbital forcing of the martian polar layered deposits |
title_fullStr |
Orbital forcing of the martian polar layered deposits |
title_full_unstemmed |
Orbital forcing of the martian polar layered deposits |
title_sort |
orbital forcing of the martian polar layered deposits |
publisher |
HAL CCSD |
publishDate |
2002 |
url |
https://hal.archives-ouvertes.fr/hal-03785478 https://doi.org/10.1038/nature01066 |
geographic |
North Pole |
geographic_facet |
North Pole |
genre |
Ice cap |
genre_facet |
Ice cap |
op_source |
ISSN: 0028-0836 EISSN: 1476-4687 Nature https://hal.archives-ouvertes.fr/hal-03785478 Nature, 2002, 419, pp.375-377. ⟨10.1038/nature01066⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/nature01066 hal-03785478 https://hal.archives-ouvertes.fr/hal-03785478 BIBCODE: 2002Natur.419.375L doi:10.1038/nature01066 |
op_doi |
https://doi.org/10.1038/nature01066 |
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Nature |
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419 |
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6905 |
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375 |
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377 |
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