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...
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ftunivtasecite:oai:ecite.utas.edu.au:93179 2023-05-15T13:37:24+02:00 Rapid bedrock uplift in the Antarctic Peninsula explained by viscoelastic response to recent ice unloading Nield, GA Barletta, VR Bordoni, A King, MA Whitehouse, PL Clarke, PJ Domack, E Scambos, TA Berthier, E 2014 application/pdf https://doi.org/10.1016/j.epsl.2014.04.019 http://ecite.utas.edu.au/93179 en eng Elsevier Science Bv http://ecite.utas.edu.au/93179/1/1-s2.0-S0012821X14002519-main.pdf http://dx.doi.org/10.1016/j.epsl.2014.04.019 http://purl.org/au-research/grants/arc/FT110100207 Nield, GA and Barletta, VR and Bordoni, A and King, MA and Whitehouse, PL and Clarke, PJ and Domack, E and Scambos, TA and Berthier, E, Rapid bedrock uplift in the Antarctic Peninsula explained by viscoelastic response to recent ice unloading, Earth and Planetary Science Letters, 397 pp. 32-41. ISSN 0012-821X (2014) [Refereed Article] http://ecite.utas.edu.au/93179 Engineering Geomatic Engineering Geodesy Refereed Article PeerReviewed 2014 ftunivtasecite https://doi.org/10.1016/j.epsl.2014.04.019 2019-12-13T21:56:04Z 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 66S 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 100140 km and upper mantle viscosity of 6 x 10 17 - 2 x 10 18 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 eCite UTAS (University of Tasmania) Antarctic Antarctic Peninsula The Antarctic Earth and Planetary Science Letters 397 32 41 |
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Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Engineering Geomatic Engineering Geodesy |
spellingShingle |
Engineering Geomatic Engineering Geodesy Nield, GA Barletta, VR Bordoni, A King, MA Whitehouse, PL Clarke, PJ Domack, E Scambos, TA Berthier, E Rapid bedrock uplift in the Antarctic Peninsula explained by viscoelastic response to recent ice unloading |
topic_facet |
Engineering Geomatic Engineering Geodesy |
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 66S 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 100140 km and upper mantle viscosity of 6 x 10 17 - 2 x 10 18 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, GA Barletta, VR Bordoni, A King, MA Whitehouse, PL Clarke, PJ Domack, E Scambos, TA Berthier, E |
author_facet |
Nield, GA Barletta, VR Bordoni, A King, MA Whitehouse, PL Clarke, PJ Domack, E Scambos, TA Berthier, E |
author_sort |
Nield, GA |
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 |
publisher |
Elsevier Science Bv |
publishDate |
2014 |
url |
https://doi.org/10.1016/j.epsl.2014.04.019 http://ecite.utas.edu.au/93179 |
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_relation |
http://ecite.utas.edu.au/93179/1/1-s2.0-S0012821X14002519-main.pdf http://dx.doi.org/10.1016/j.epsl.2014.04.019 http://purl.org/au-research/grants/arc/FT110100207 Nield, GA and Barletta, VR and Bordoni, A and King, MA and Whitehouse, PL and Clarke, PJ and Domack, E and Scambos, TA and Berthier, E, Rapid bedrock uplift in the Antarctic Peninsula explained by viscoelastic response to recent ice unloading, Earth and Planetary Science Letters, 397 pp. 32-41. ISSN 0012-821X (2014) [Refereed Article] http://ecite.utas.edu.au/93179 |
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_ |
1766091296869449728 |