Modeling satellite gravity gradient data to derive density, temperature, and viscosity structure of the Antarctic lithosphere
In this study we combine seismological and petrological models with satellite gravity gradient data to obtain the thermal and compositional structure of the Antarctic lithosphere. Our results indicate that Antarctica is largely in isostatic equilibrium, although notable anomalies exist. A new Antarc...
Published in: | Journal of Geophysical Research: Solid Earth |
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American Geophysical Union
2019
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ftnerc:oai:nora.nerc.ac.uk:525747 2023-05-15T13:41:44+02:00 Modeling satellite gravity gradient data to derive density, temperature, and viscosity structure of the Antarctic lithosphere Pappa, F. Ebbing, J. Ferraccioli, F. van der Wal, W. 2019-12 text http://nora.nerc.ac.uk/id/eprint/525747/ https://nora.nerc.ac.uk/id/eprint/525747/1/Pappa_et_al-2019-Journal_of_Geophysical_Research__Solid_Earth.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019JB017997 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/525747/1/Pappa_et_al-2019-Journal_of_Geophysical_Research__Solid_Earth.pdf Pappa, F.; Ebbing, J.; Ferraccioli, F. orcid:0000-0002-9347-4736 van der Wal, W. 2019 Modeling satellite gravity gradient data to derive density, temperature, and viscosity structure of the Antarctic lithosphere. Journal of Geophysical Research: Solid Earth, 124 (11). 12053-12076. https://doi.org/10.1029/2019JB017997 <https://doi.org/10.1029/2019JB017997> cc_by_nc_nd_4 CC-BY-NC-ND Publication - Article PeerReviewed 2019 ftnerc https://doi.org/10.1029/2019JB017997 2023-02-04T19:49:35Z In this study we combine seismological and petrological models with satellite gravity gradient data to obtain the thermal and compositional structure of the Antarctic lithosphere. Our results indicate that Antarctica is largely in isostatic equilibrium, although notable anomalies exist. A new Antarctic Moho depth map is derived that fits the satellite gravity gradient anomaly field and is in good agreement with independent seismic estimates. It exhibits detailed crustal thickness variations also in areas of East Antarctica that are poorly explored due to sparse seismic station coverage. The thickness of the lithosphere in our model is in general agreement with seismological estimates, confirming the marked contrast between West Antarctica (<100 km) and East Antarctica (up to 260 km). Finally, we assess the implications of the temperature distribution in our model for mantle viscosities and glacial isostatic adjustment. The upper mantle temperatures we model are lower than obtained from previous seismic velocity studies. This results in higher estimated viscosities underneath West Antarctica. When combined with present‐day uplift rates from GPS, a bulk dry upper mantle rheology appears permissible. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica West Antarctica Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic East Antarctica West Antarctica Journal of Geophysical Research: Solid Earth 124 11 12053 12076 |
institution |
Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
language |
English |
description |
In this study we combine seismological and petrological models with satellite gravity gradient data to obtain the thermal and compositional structure of the Antarctic lithosphere. Our results indicate that Antarctica is largely in isostatic equilibrium, although notable anomalies exist. A new Antarctic Moho depth map is derived that fits the satellite gravity gradient anomaly field and is in good agreement with independent seismic estimates. It exhibits detailed crustal thickness variations also in areas of East Antarctica that are poorly explored due to sparse seismic station coverage. The thickness of the lithosphere in our model is in general agreement with seismological estimates, confirming the marked contrast between West Antarctica (<100 km) and East Antarctica (up to 260 km). Finally, we assess the implications of the temperature distribution in our model for mantle viscosities and glacial isostatic adjustment. The upper mantle temperatures we model are lower than obtained from previous seismic velocity studies. This results in higher estimated viscosities underneath West Antarctica. When combined with present‐day uplift rates from GPS, a bulk dry upper mantle rheology appears permissible. |
format |
Article in Journal/Newspaper |
author |
Pappa, F. Ebbing, J. Ferraccioli, F. van der Wal, W. |
spellingShingle |
Pappa, F. Ebbing, J. Ferraccioli, F. van der Wal, W. Modeling satellite gravity gradient data to derive density, temperature, and viscosity structure of the Antarctic lithosphere |
author_facet |
Pappa, F. Ebbing, J. Ferraccioli, F. van der Wal, W. |
author_sort |
Pappa, F. |
title |
Modeling satellite gravity gradient data to derive density, temperature, and viscosity structure of the Antarctic lithosphere |
title_short |
Modeling satellite gravity gradient data to derive density, temperature, and viscosity structure of the Antarctic lithosphere |
title_full |
Modeling satellite gravity gradient data to derive density, temperature, and viscosity structure of the Antarctic lithosphere |
title_fullStr |
Modeling satellite gravity gradient data to derive density, temperature, and viscosity structure of the Antarctic lithosphere |
title_full_unstemmed |
Modeling satellite gravity gradient data to derive density, temperature, and viscosity structure of the Antarctic lithosphere |
title_sort |
modeling satellite gravity gradient data to derive density, temperature, and viscosity structure of the antarctic lithosphere |
publisher |
American Geophysical Union |
publishDate |
2019 |
url |
http://nora.nerc.ac.uk/id/eprint/525747/ https://nora.nerc.ac.uk/id/eprint/525747/1/Pappa_et_al-2019-Journal_of_Geophysical_Research__Solid_Earth.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2019JB017997 |
geographic |
Antarctic The Antarctic East Antarctica West Antarctica |
geographic_facet |
Antarctic The Antarctic East Antarctica West Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica West Antarctica |
op_relation |
https://nora.nerc.ac.uk/id/eprint/525747/1/Pappa_et_al-2019-Journal_of_Geophysical_Research__Solid_Earth.pdf Pappa, F.; Ebbing, J.; Ferraccioli, F. orcid:0000-0002-9347-4736 van der Wal, W. 2019 Modeling satellite gravity gradient data to derive density, temperature, and viscosity structure of the Antarctic lithosphere. Journal of Geophysical Research: Solid Earth, 124 (11). 12053-12076. https://doi.org/10.1029/2019JB017997 <https://doi.org/10.1029/2019JB017997> |
op_rights |
cc_by_nc_nd_4 |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.1029/2019JB017997 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
124 |
container_issue |
11 |
container_start_page |
12053 |
op_container_end_page |
12076 |
_version_ |
1766156175126036480 |