Rapid bedrock uplift in the Antarctic Peninsula explained by viscoelastic response to recent ice unloading
Since 1995 several ice shelves in the Northern Antarctic Peninsula have collapsed and triggered ice-mass unloading, invoking a solid Earth response that has been recorded at continuous GPS (cGPS) stations. A previous attempt to model the observation of rapid uplift following the 2002 breakup of Lars...
Published in: | Earth and Planetary Science Letters |
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Format: | Article in Journal/Newspaper |
Language: | English |
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2014
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Online Access: | https://orbit.dtu.dk/en/publications/7af27fd5-8392-4567-b915-34d5fb9771d0 https://doi.org/10.1016/j.epsl.2014.04.019 https://backend.orbit.dtu.dk/ws/files/92681366/Rapid_bedrock_uplift.pdf |
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ftdtupubl:oai:pure.atira.dk:publications/7af27fd5-8392-4567-b915-34d5fb9771d0 2024-09-09T19:06:45+00:00 Rapid bedrock uplift in the Antarctic Peninsula explained by viscoelastic response to recent ice unloading Nield, Grace A. Barletta, Valentina Roberta Bordoni, Andrea King, Matt A. Whitehouse, Pippa L. Clarke, Peter J. Domack, Eugene Scambos, Ted A. Berthier, Etienne 2014 application/pdf https://orbit.dtu.dk/en/publications/7af27fd5-8392-4567-b915-34d5fb9771d0 https://doi.org/10.1016/j.epsl.2014.04.019 https://backend.orbit.dtu.dk/ws/files/92681366/Rapid_bedrock_uplift.pdf eng eng https://orbit.dtu.dk/en/publications/7af27fd5-8392-4567-b915-34d5fb9771d0 info:eu-repo/semantics/openAccess Nield , G A , Barletta , V R , Bordoni , A , King , M A , Whitehouse , P L , Clarke , P J , Domack , E , Scambos , T A & Berthier , E 2014 , ' Rapid bedrock uplift in the Antarctic Peninsula explained by viscoelastic response to recent ice unloading ' , Earth and Planetary Science Letters , vol. 397 , pp. 32-41 . https://doi.org/10.1016/j.epsl.2014.04.019 Antarctic Peninsula Larsen B ice-mass loss viscoelastic uplift GPS upper mantle viscosity article 2014 ftdtupubl https://doi.org/10.1016/j.epsl.2014.04.019 2024-07-29T23:50:17Z Since 1995 several ice shelves in the Northern Antarctic Peninsula have collapsed and triggered ice-mass unloading, invoking a solid Earth response that has been recorded at continuous GPS (cGPS) stations. A previous attempt to model the observation of rapid uplift following the 2002 breakup of Larsen B Ice Shelf was limited by incomplete knowledge of the pattern of ice unloading and possibly the assumption of an elastic-only mechanism. We make use of a new high resolution dataset of ice elevation change that captures ice-mass loss north of 66°S to first show that non-linear uplift of the Palmer cGPS station since 2002 cannot be explained by elastic deformation alone. We apply a viscoelastic model with linear Maxwell rheology to predict uplift since 1995 and test the fit to the Palmer cGPS time series, finding a well constrained upper mantle viscosity but less sensitivity to lithospheric thickness. We further constrain the best fitting Earth model by including six cGPS stations deployed after 2009 (the LARISSA network), with vertical velocities in the range 1.7 to 14.9 mm/yr. This results in a best fitting Earth model with lithospheric thickness of 100–140 km and upper mantle viscosity of 6×1017–2×1018 Pas – much lower than previously suggested for this region. Combining the LARISSA time series with the Palmer cGPS time series offers a rare opportunity to study the time-evolution of the low-viscosity solid Earth response to a well-captured ice unloading event. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Ice Shelf Ice Shelves Technical University of Denmark: DTU Orbit Antarctic Antarctic Peninsula The Antarctic Earth and Planetary Science Letters 397 32 41 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Antarctic Peninsula Larsen B ice-mass loss viscoelastic uplift GPS upper mantle viscosity |
spellingShingle |
Antarctic Peninsula Larsen B ice-mass loss viscoelastic uplift GPS upper mantle viscosity Nield, Grace A. Barletta, Valentina Roberta Bordoni, Andrea King, Matt A. Whitehouse, Pippa L. Clarke, Peter J. Domack, Eugene Scambos, Ted A. Berthier, Etienne Rapid bedrock uplift in the Antarctic Peninsula explained by viscoelastic response to recent ice unloading |
topic_facet |
Antarctic Peninsula Larsen B ice-mass loss viscoelastic uplift GPS upper mantle viscosity |
description |
Since 1995 several ice shelves in the Northern Antarctic Peninsula have collapsed and triggered ice-mass unloading, invoking a solid Earth response that has been recorded at continuous GPS (cGPS) stations. A previous attempt to model the observation of rapid uplift following the 2002 breakup of Larsen B Ice Shelf was limited by incomplete knowledge of the pattern of ice unloading and possibly the assumption of an elastic-only mechanism. We make use of a new high resolution dataset of ice elevation change that captures ice-mass loss north of 66°S to first show that non-linear uplift of the Palmer cGPS station since 2002 cannot be explained by elastic deformation alone. We apply a viscoelastic model with linear Maxwell rheology to predict uplift since 1995 and test the fit to the Palmer cGPS time series, finding a well constrained upper mantle viscosity but less sensitivity to lithospheric thickness. We further constrain the best fitting Earth model by including six cGPS stations deployed after 2009 (the LARISSA network), with vertical velocities in the range 1.7 to 14.9 mm/yr. This results in a best fitting Earth model with lithospheric thickness of 100–140 km and upper mantle viscosity of 6×1017–2×1018 Pas – much lower than previously suggested for this region. Combining the LARISSA time series with the Palmer cGPS time series offers a rare opportunity to study the time-evolution of the low-viscosity solid Earth response to a well-captured ice unloading event. |
format |
Article in Journal/Newspaper |
author |
Nield, Grace A. Barletta, Valentina Roberta Bordoni, Andrea King, Matt A. Whitehouse, Pippa L. Clarke, Peter J. Domack, Eugene Scambos, Ted A. Berthier, Etienne |
author_facet |
Nield, Grace A. Barletta, Valentina Roberta Bordoni, Andrea King, Matt A. Whitehouse, Pippa L. Clarke, Peter J. Domack, Eugene Scambos, Ted A. Berthier, Etienne |
author_sort |
Nield, Grace A. |
title |
Rapid bedrock uplift in the Antarctic Peninsula explained by viscoelastic response to recent ice unloading |
title_short |
Rapid bedrock uplift in the Antarctic Peninsula explained by viscoelastic response to recent ice unloading |
title_full |
Rapid bedrock uplift in the Antarctic Peninsula explained by viscoelastic response to recent ice unloading |
title_fullStr |
Rapid bedrock uplift in the Antarctic Peninsula explained by viscoelastic response to recent ice unloading |
title_full_unstemmed |
Rapid bedrock uplift in the Antarctic Peninsula explained by viscoelastic response to recent ice unloading |
title_sort |
rapid bedrock uplift in the antarctic peninsula explained by viscoelastic response to recent ice unloading |
publishDate |
2014 |
url |
https://orbit.dtu.dk/en/publications/7af27fd5-8392-4567-b915-34d5fb9771d0 https://doi.org/10.1016/j.epsl.2014.04.019 https://backend.orbit.dtu.dk/ws/files/92681366/Rapid_bedrock_uplift.pdf |
geographic |
Antarctic Antarctic Peninsula The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Ice Shelf Ice Shelves |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ice Shelf Ice Shelves |
op_source |
Nield , G A , Barletta , V R , Bordoni , A , King , M A , Whitehouse , P L , Clarke , P J , Domack , E , Scambos , T A & Berthier , E 2014 , ' Rapid bedrock uplift in the Antarctic Peninsula explained by viscoelastic response to recent ice unloading ' , Earth and Planetary Science Letters , vol. 397 , pp. 32-41 . https://doi.org/10.1016/j.epsl.2014.04.019 |
op_relation |
https://orbit.dtu.dk/en/publications/7af27fd5-8392-4567-b915-34d5fb9771d0 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.epsl.2014.04.019 |
container_title |
Earth and Planetary Science Letters |
container_volume |
397 |
container_start_page |
32 |
op_container_end_page |
41 |
_version_ |
1809820786279579648 |