Crustal thickness of Antarctica estimated using data from gravimetric satellites
International audience Abstract. Computing a better crustal thickness model is still a necessary improvement in Antarctica. In this remote continent where almost all the bedrock is covered by the ice sheet, seismic investigations do not reach a sufficient spatial resolution for geological and geophy...
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ftutoulouse3hal:oai:HAL:hal-03337285v1 2023-12-17T10:20:08+01:00 Crustal thickness of Antarctica estimated using data from gravimetric satellites Llubes, Muriel Seoane, Lucia Bruinsma, Sean Rémy, Frédérique Géosciences Environnement Toulouse (GET) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT) Centre National d'Études Spatiales Toulouse (CNES) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) 2018 https://hal.science/hal-03337285 https://hal.science/hal-03337285/document https://hal.science/hal-03337285/file/se-9-457-2018.pdf https://doi.org/10.5194/se-9-457-2018 en eng HAL CCSD European Geosciences Union info:eu-repo/semantics/altIdentifier/doi/10.5194/se-9-457-2018 hal-03337285 https://hal.science/hal-03337285 https://hal.science/hal-03337285/document https://hal.science/hal-03337285/file/se-9-457-2018.pdf doi:10.5194/se-9-457-2018 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1869-9510 EISSN: 1869-9529 Solid Earth https://hal.science/hal-03337285 Solid Earth, 2018, 9 (2), pp.457-467. ⟨10.5194/se-9-457-2018⟩ [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2018 ftutoulouse3hal https://doi.org/10.5194/se-9-457-2018 2023-11-22T17:58:11Z International audience Abstract. Computing a better crustal thickness model is still a necessary improvement in Antarctica. In this remote continent where almost all the bedrock is covered by the ice sheet, seismic investigations do not reach a sufficient spatial resolution for geological and geophysical purposes. Here, we present a global map of Antarctic crustal thickness computed from space gravity observations. The DIR5 gravity field model, built from GOCE and GRACE gravimetric data, is inverted with the Parker–Oldenburg iterative algorithm. The BEDMAP products are used to estimate the gravity effect of the ice and the rocky surface. Our result is compared to crustal thickness calculated from seismological studies and the CRUST1.0 and AN1 models. Although the CRUST1.0 model shows a very good agreement with ours, its spatial resolution is larger than the one we obtain with gravimetric data. Finally, we compute a model in which the crust–mantle density contrast is adjusted to fit the Moho depth from the CRUST1.0 model. In East Antarctica, the resulting density contrast clearly shows higher values than in West Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet West Antarctica Université Toulouse III - Paul Sabatier: HAL-UPS Antarctic East Antarctica Oldenburg West Antarctica Solid Earth 9 2 457 467 |
institution |
Open Polar |
collection |
Université Toulouse III - Paul Sabatier: HAL-UPS |
op_collection_id |
ftutoulouse3hal |
language |
English |
topic |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
spellingShingle |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Llubes, Muriel Seoane, Lucia Bruinsma, Sean Rémy, Frédérique Crustal thickness of Antarctica estimated using data from gravimetric satellites |
topic_facet |
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
description |
International audience Abstract. Computing a better crustal thickness model is still a necessary improvement in Antarctica. In this remote continent where almost all the bedrock is covered by the ice sheet, seismic investigations do not reach a sufficient spatial resolution for geological and geophysical purposes. Here, we present a global map of Antarctic crustal thickness computed from space gravity observations. The DIR5 gravity field model, built from GOCE and GRACE gravimetric data, is inverted with the Parker–Oldenburg iterative algorithm. The BEDMAP products are used to estimate the gravity effect of the ice and the rocky surface. Our result is compared to crustal thickness calculated from seismological studies and the CRUST1.0 and AN1 models. Although the CRUST1.0 model shows a very good agreement with ours, its spatial resolution is larger than the one we obtain with gravimetric data. Finally, we compute a model in which the crust–mantle density contrast is adjusted to fit the Moho depth from the CRUST1.0 model. In East Antarctica, the resulting density contrast clearly shows higher values than in West Antarctica. |
author2 |
Géosciences Environnement Toulouse (GET) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT) Centre National d'Études Spatiales Toulouse (CNES) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) |
format |
Article in Journal/Newspaper |
author |
Llubes, Muriel Seoane, Lucia Bruinsma, Sean Rémy, Frédérique |
author_facet |
Llubes, Muriel Seoane, Lucia Bruinsma, Sean Rémy, Frédérique |
author_sort |
Llubes, Muriel |
title |
Crustal thickness of Antarctica estimated using data from gravimetric satellites |
title_short |
Crustal thickness of Antarctica estimated using data from gravimetric satellites |
title_full |
Crustal thickness of Antarctica estimated using data from gravimetric satellites |
title_fullStr |
Crustal thickness of Antarctica estimated using data from gravimetric satellites |
title_full_unstemmed |
Crustal thickness of Antarctica estimated using data from gravimetric satellites |
title_sort |
crustal thickness of antarctica estimated using data from gravimetric satellites |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.science/hal-03337285 https://hal.science/hal-03337285/document https://hal.science/hal-03337285/file/se-9-457-2018.pdf https://doi.org/10.5194/se-9-457-2018 |
geographic |
Antarctic East Antarctica Oldenburg West Antarctica |
geographic_facet |
Antarctic East Antarctica Oldenburg West Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet West Antarctica |
op_source |
ISSN: 1869-9510 EISSN: 1869-9529 Solid Earth https://hal.science/hal-03337285 Solid Earth, 2018, 9 (2), pp.457-467. ⟨10.5194/se-9-457-2018⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/se-9-457-2018 hal-03337285 https://hal.science/hal-03337285 https://hal.science/hal-03337285/document https://hal.science/hal-03337285/file/se-9-457-2018.pdf doi:10.5194/se-9-457-2018 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/se-9-457-2018 |
container_title |
Solid Earth |
container_volume |
9 |
container_issue |
2 |
container_start_page |
457 |
op_container_end_page |
467 |
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