Inverting Glacial Isostatic Adjustment signal using Bayesian framework and two linearly relaxing rheologies
International audience Glacial Isostatic Adjustment (GIA) models commonly assume a mantle with a viscoelastic Maxwell rheology and a fixed ice history model. Here, we use a Bayesian Monte Carlo approach with a Markov chain formalism to invert the global GIA signal simultaneously for the mechanical p...
Published in: | Geophysical Journal International |
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Main Authors: | , , , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2017
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Online Access: | https://insu.hal.science/insu-03747285 https://insu.hal.science/insu-03747285/document https://insu.hal.science/insu-03747285/file/ggx083.pdf https://doi.org/10.1093/gji/ggx083 |
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ftsorbonneuniv:oai:HAL:insu-03747285v1 |
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Open Polar |
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HAL Sorbonne Université |
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ftsorbonneuniv |
language |
English |
topic |
Gravity anomalies and Earth structure Sea level change Transient deformation Probability distributions Dynamics of lithosphere and mantle Rheology: mantle [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Gravity anomalies and Earth structure Sea level change Transient deformation Probability distributions Dynamics of lithosphere and mantle Rheology: mantle [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Caron, L. Métivier, L. Greff-Lefftz, M. Fleitout, L. Rouby, H. Inverting Glacial Isostatic Adjustment signal using Bayesian framework and two linearly relaxing rheologies |
topic_facet |
Gravity anomalies and Earth structure Sea level change Transient deformation Probability distributions Dynamics of lithosphere and mantle Rheology: mantle [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Glacial Isostatic Adjustment (GIA) models commonly assume a mantle with a viscoelastic Maxwell rheology and a fixed ice history model. Here, we use a Bayesian Monte Carlo approach with a Markov chain formalism to invert the global GIA signal simultaneously for the mechanical properties of the mantle and the volumes of the ice sheets, using as starting ice models two previously published ice histories. Two stress relaxing rheologies are considered: Burgers and Maxwell linear viscoelasticities. A total of 5720 global palaeo sea level records are used, covering the last 35 kyr. Our goal is not only to seek the model best fitting this data set, but also to determine and display the range of possible solutions with their respective probability of explaining the data. In all cases, our a posteriori probability maps exhibit the classic character of solutions for GIA-determined mantle viscosity with two distinct peaks. What is new in our treatment is the presence of the bi-viscous Burgers rheology and the fact that we invert rheology jointly with ice history, in combination with the greatly expanded palaeo sea level records. The solutions tend to be characterized by an upper-mantle viscosity of around 5 × 10 20 Pa s with one preferred lower-mantle viscosities at 3 × 10 21 Pa s and the other more than 2 × 10 22 Pa s, a rather classical pairing. Best-fitting models depend upon the starting ice history and the stress relaxing law. A first peak (P1) has the highest probability only in the case with a Maxwell rheology and ice history based on ICE-5G, while the second peak (P2) is favoured for ANU-based ice history or Burgers stress relaxation. The latter solution also may satisfy lower-mantle viscosity inferences from long-term geodynamics and gravity gradient anomalies over Laurentia. P2 is also consistent with large Laurentian and Fennoscandian ice-sheet volumes at the Last Glacial Maximum (LGM) and smaller LGM Antarctic ice volume than in either ICE-5G or ANU. Exploration of a bi-viscous linear ... |
author2 |
Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de géologie de l'ENS (LGENS) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) |
format |
Article in Journal/Newspaper |
author |
Caron, L. Métivier, L. Greff-Lefftz, M. Fleitout, L. Rouby, H. |
author_facet |
Caron, L. Métivier, L. Greff-Lefftz, M. Fleitout, L. Rouby, H. |
author_sort |
Caron, L. |
title |
Inverting Glacial Isostatic Adjustment signal using Bayesian framework and two linearly relaxing rheologies |
title_short |
Inverting Glacial Isostatic Adjustment signal using Bayesian framework and two linearly relaxing rheologies |
title_full |
Inverting Glacial Isostatic Adjustment signal using Bayesian framework and two linearly relaxing rheologies |
title_fullStr |
Inverting Glacial Isostatic Adjustment signal using Bayesian framework and two linearly relaxing rheologies |
title_full_unstemmed |
Inverting Glacial Isostatic Adjustment signal using Bayesian framework and two linearly relaxing rheologies |
title_sort |
inverting glacial isostatic adjustment signal using bayesian framework and two linearly relaxing rheologies |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://insu.hal.science/insu-03747285 https://insu.hal.science/insu-03747285/document https://insu.hal.science/insu-03747285/file/ggx083.pdf https://doi.org/10.1093/gji/ggx083 |
genre |
Antarc* Antarctic Fennoscandian Ice Sheet |
genre_facet |
Antarc* Antarctic Fennoscandian Ice Sheet |
op_source |
ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://insu.hal.science/insu-03747285 Geophysical Journal International, 2017, 209, pp.1126-1147. ⟨10.1093/gji/ggx083⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggx083 insu-03747285 https://insu.hal.science/insu-03747285 https://insu.hal.science/insu-03747285/document https://insu.hal.science/insu-03747285/file/ggx083.pdf BIBCODE: 2017GeoJI.209.1126C doi:10.1093/gji/ggx083 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1093/gji/ggx083 |
container_title |
Geophysical Journal International |
container_volume |
209 |
container_issue |
2 |
container_start_page |
1126 |
op_container_end_page |
1147 |
_version_ |
1810497217745649664 |
spelling |
ftsorbonneuniv:oai:HAL:insu-03747285v1 2024-09-15T17:47:43+00:00 Inverting Glacial Isostatic Adjustment signal using Bayesian framework and two linearly relaxing rheologies Caron, L. Métivier, L. Greff-Lefftz, M. Fleitout, L. Rouby, H. Institut de Physique du Globe de Paris (IPGP) Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de géologie de l'ENS (LGENS) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Département des Géosciences - ENS Paris École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL) 2017 https://insu.hal.science/insu-03747285 https://insu.hal.science/insu-03747285/document https://insu.hal.science/insu-03747285/file/ggx083.pdf https://doi.org/10.1093/gji/ggx083 en eng HAL CCSD Oxford University Press (OUP) info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggx083 insu-03747285 https://insu.hal.science/insu-03747285 https://insu.hal.science/insu-03747285/document https://insu.hal.science/insu-03747285/file/ggx083.pdf BIBCODE: 2017GeoJI.209.1126C doi:10.1093/gji/ggx083 info:eu-repo/semantics/OpenAccess ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://insu.hal.science/insu-03747285 Geophysical Journal International, 2017, 209, pp.1126-1147. ⟨10.1093/gji/ggx083⟩ Gravity anomalies and Earth structure Sea level change Transient deformation Probability distributions Dynamics of lithosphere and mantle Rheology: mantle [SDU]Sciences of the Universe [physics] [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2017 ftsorbonneuniv https://doi.org/10.1093/gji/ggx083 2024-07-25T23:47:48Z International audience Glacial Isostatic Adjustment (GIA) models commonly assume a mantle with a viscoelastic Maxwell rheology and a fixed ice history model. Here, we use a Bayesian Monte Carlo approach with a Markov chain formalism to invert the global GIA signal simultaneously for the mechanical properties of the mantle and the volumes of the ice sheets, using as starting ice models two previously published ice histories. Two stress relaxing rheologies are considered: Burgers and Maxwell linear viscoelasticities. A total of 5720 global palaeo sea level records are used, covering the last 35 kyr. Our goal is not only to seek the model best fitting this data set, but also to determine and display the range of possible solutions with their respective probability of explaining the data. In all cases, our a posteriori probability maps exhibit the classic character of solutions for GIA-determined mantle viscosity with two distinct peaks. What is new in our treatment is the presence of the bi-viscous Burgers rheology and the fact that we invert rheology jointly with ice history, in combination with the greatly expanded palaeo sea level records. The solutions tend to be characterized by an upper-mantle viscosity of around 5 × 10 20 Pa s with one preferred lower-mantle viscosities at 3 × 10 21 Pa s and the other more than 2 × 10 22 Pa s, a rather classical pairing. Best-fitting models depend upon the starting ice history and the stress relaxing law. A first peak (P1) has the highest probability only in the case with a Maxwell rheology and ice history based on ICE-5G, while the second peak (P2) is favoured for ANU-based ice history or Burgers stress relaxation. The latter solution also may satisfy lower-mantle viscosity inferences from long-term geodynamics and gravity gradient anomalies over Laurentia. P2 is also consistent with large Laurentian and Fennoscandian ice-sheet volumes at the Last Glacial Maximum (LGM) and smaller LGM Antarctic ice volume than in either ICE-5G or ANU. Exploration of a bi-viscous linear ... Article in Journal/Newspaper Antarc* Antarctic Fennoscandian Ice Sheet HAL Sorbonne Université Geophysical Journal International 209 2 1126 1147 |