Circumpolar ocean stability on Mars 3 Gy ago
International audience What was the nature of the Late Hesperian climate, warm and wet or cold and dry? Formulated this way the question leads to an apparent paradox since both options seem implausible. A warm and wet climate would have produced extensive fluvial erosion but few valley networks have...
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ftinsu:oai:HAL:insu-03718991v1 2023-11-12T04:18:49+01:00 Circumpolar ocean stability on Mars 3 Gy ago Schmidt, Frédéric Way, Michael J. Costard, François Bouley, Sylvain Séjourné, Antoine Aleinov, Igor Géosciences Paris Saclay (GEOPS) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) NASA Goddard Institute for Space Studies (GISS) NASA Goddard Space Flight Center (GSFC) 2022 https://insu.hal.science/insu-03718991 https://insu.hal.science/insu-03718991/document https://insu.hal.science/insu-03718991/file/StableMartianOcean_PNAS%20%281%29.pdf https://doi.org/10.1073/pnas.2112930118 en eng HAL CCSD National Academy of Sciences info:eu-repo/semantics/altIdentifier/doi/10.1073/pnas.2112930118 insu-03718991 https://insu.hal.science/insu-03718991 https://insu.hal.science/insu-03718991/document https://insu.hal.science/insu-03718991/file/StableMartianOcean_PNAS%20%281%29.pdf BIBCODE: 2022PNAS.11912930S doi:10.1073/pnas.2112930118 PUBMEDCENTRAL: PMC8795497 info:eu-repo/semantics/OpenAccess ISSN: 0027-8424 EISSN: 1091-6490 Proceedings of the National Academy of Sciences of the United States of America https://insu.hal.science/insu-03718991 Proceedings of the National Academy of Sciences of the United States of America, 2022, 119 (4), pp.e2112930118. ⟨10.1073/pnas.2112930118⟩ Mars paleoclimate dynamic ocean ice sheet [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2022 ftinsu https://doi.org/10.1073/pnas.2112930118 2023-10-18T16:24:43Z International audience What was the nature of the Late Hesperian climate, warm and wet or cold and dry? Formulated this way the question leads to an apparent paradox since both options seem implausible. A warm and wet climate would have produced extensive fluvial erosion but few valley networks have been observed at the age of the Late Hesperian. A too cold climate would have kept any northern ocean frozen most of the time. A moderate cold climate would have transferred the water from the ocean to the land in the form of snow and ice. But this would prevent tsunami formation, for which there is some evidence. Here, we provide insights from numerical climate simulations in agreement with surface geological features to demonstrate that the Martian climate could have been both cold and wet. Using an advanced general circulation model (GCM), we demonstrate that an ocean can be stable, even if the Martian mean surface temperature is lower than 0 ∘C. Rainfall is moderate near the shorelines and in the ocean. The southern plateau is mostly covered by ice with a mean temperature below 0 ∘C and a glacier return flow back to the ocean. This climate is achieved with a 1-bar CO2-dominated atmosphere with 10% H2. Under this scenario of 3 Ga, the geologic evidence of a shoreline and tsunami deposits along the ocean/land dichotomy are compatible with ice sheets and glacial valleys in the southern highlands. Article in Journal/Newspaper Ice Sheet Institut national des sciences de l'Univers: HAL-INSU Proceedings of the National Academy of Sciences 119 4 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Mars paleoclimate dynamic ocean ice sheet [SDU]Sciences of the Universe [physics] |
spellingShingle |
Mars paleoclimate dynamic ocean ice sheet [SDU]Sciences of the Universe [physics] Schmidt, Frédéric Way, Michael J. Costard, François Bouley, Sylvain Séjourné, Antoine Aleinov, Igor Circumpolar ocean stability on Mars 3 Gy ago |
topic_facet |
Mars paleoclimate dynamic ocean ice sheet [SDU]Sciences of the Universe [physics] |
description |
International audience What was the nature of the Late Hesperian climate, warm and wet or cold and dry? Formulated this way the question leads to an apparent paradox since both options seem implausible. A warm and wet climate would have produced extensive fluvial erosion but few valley networks have been observed at the age of the Late Hesperian. A too cold climate would have kept any northern ocean frozen most of the time. A moderate cold climate would have transferred the water from the ocean to the land in the form of snow and ice. But this would prevent tsunami formation, for which there is some evidence. Here, we provide insights from numerical climate simulations in agreement with surface geological features to demonstrate that the Martian climate could have been both cold and wet. Using an advanced general circulation model (GCM), we demonstrate that an ocean can be stable, even if the Martian mean surface temperature is lower than 0 ∘C. Rainfall is moderate near the shorelines and in the ocean. The southern plateau is mostly covered by ice with a mean temperature below 0 ∘C and a glacier return flow back to the ocean. This climate is achieved with a 1-bar CO2-dominated atmosphere with 10% H2. Under this scenario of 3 Ga, the geologic evidence of a shoreline and tsunami deposits along the ocean/land dichotomy are compatible with ice sheets and glacial valleys in the southern highlands. |
author2 |
Géosciences Paris Saclay (GEOPS) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) NASA Goddard Institute for Space Studies (GISS) NASA Goddard Space Flight Center (GSFC) |
format |
Article in Journal/Newspaper |
author |
Schmidt, Frédéric Way, Michael J. Costard, François Bouley, Sylvain Séjourné, Antoine Aleinov, Igor |
author_facet |
Schmidt, Frédéric Way, Michael J. Costard, François Bouley, Sylvain Séjourné, Antoine Aleinov, Igor |
author_sort |
Schmidt, Frédéric |
title |
Circumpolar ocean stability on Mars 3 Gy ago |
title_short |
Circumpolar ocean stability on Mars 3 Gy ago |
title_full |
Circumpolar ocean stability on Mars 3 Gy ago |
title_fullStr |
Circumpolar ocean stability on Mars 3 Gy ago |
title_full_unstemmed |
Circumpolar ocean stability on Mars 3 Gy ago |
title_sort |
circumpolar ocean stability on mars 3 gy ago |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://insu.hal.science/insu-03718991 https://insu.hal.science/insu-03718991/document https://insu.hal.science/insu-03718991/file/StableMartianOcean_PNAS%20%281%29.pdf https://doi.org/10.1073/pnas.2112930118 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
ISSN: 0027-8424 EISSN: 1091-6490 Proceedings of the National Academy of Sciences of the United States of America https://insu.hal.science/insu-03718991 Proceedings of the National Academy of Sciences of the United States of America, 2022, 119 (4), pp.e2112930118. ⟨10.1073/pnas.2112930118⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1073/pnas.2112930118 insu-03718991 https://insu.hal.science/insu-03718991 https://insu.hal.science/insu-03718991/document https://insu.hal.science/insu-03718991/file/StableMartianOcean_PNAS%20%281%29.pdf BIBCODE: 2022PNAS.11912930S doi:10.1073/pnas.2112930118 PUBMEDCENTRAL: PMC8795497 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1073/pnas.2112930118 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
119 |
container_issue |
4 |
_version_ |
1782335363054829568 |