Reduced ice mass loss and three-dimensional viscoelastic deformation in northern Antarctic Peninsula inferred from GPS
We consider the viscoelastic rheology of the solid Earth under the Antarctic Peninsula due to ice mass loss that commenced after the breakup of the Larsen-B ice shelf. We extend the previous analysis of nearby continuous GPS time-series to include five additional years and the additional considerati...
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2020
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Online Access: | https://doi.org/10.1093/gji/ggaa229 http://ecite.utas.edu.au/139276 |
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ftunivtasecite:oai:ecite.utas.edu.au:139276 2023-05-15T13:42:40+02:00 Reduced ice mass loss and three-dimensional viscoelastic deformation in northern Antarctic Peninsula inferred from GPS Samrat, NH King, MA Watson, C Hooper, A Chen, X Barletta, VR Bordoni, A 2020 application/pdf https://doi.org/10.1093/gji/ggaa229 http://ecite.utas.edu.au/139276 en eng Blackwell Publishing Ltd http://ecite.utas.edu.au/139276/1/139276 - Reduced ice mass loss and three-dimensional viscoelastic deformation in northern Antarctic Peninsula inferred from GPS.pdf http://dx.doi.org/10.1093/gji/ggaa229 Samrat, NH and King, MA and Watson, C and Hooper, A and Chen, X and Barletta, VR and Bordoni, A, Reduced ice mass loss and three-dimensional viscoelastic deformation in northern Antarctic Peninsula inferred from GPS, Geophysical Journal International, 222, (2) pp. 1013-1023. ISSN 0956-540X (2020) [Refereed Article] http://ecite.utas.edu.au/139276 Earth Sciences Geophysics Geodesy Refereed Article PeerReviewed 2020 ftunivtasecite https://doi.org/10.1093/gji/ggaa229 2022-08-29T22:17:57Z We consider the viscoelastic rheology of the solid Earth under the Antarctic Peninsula due to ice mass loss that commenced after the breakup of the Larsen-B ice shelf. We extend the previous analysis of nearby continuous GPS time-series to include five additional years and the additional consideration of the horizontal components of deformation. They show strong uplift from ∼2002 to 2011 followed by reduced uplift rates to 2018. Modelling the GPS-derived uplift as a viscoelastic response to ongoing regional ice unloading from a new ice model confirms earlier estimates of low upper-mantle viscosities of ∼0.33 10 18 Pa s in this region but allows a wide range of elastic lithosphere thickness. The observed and modelled north coordinate component shows little nonlinear variation due to the location of ice mass change to the east of the GPS sites. However, comparison of the observed and modelled east coordinate component constrains the upper-mantle viscosity to be less than ∼9 10 18 Pa s, consistent with the viscosity range suggested by the uplift rates alone and providing important, largely independent, confirmation of that result. Our horizontal analysis showed only marginal sensitivity to modelled lithospheric thickness. The results for the horizontal components are sensitive to the adopted plate rotation model, with the estimate based on ITRF2014 suggesting that the sum of residual plate motion and pre-2002 glacial isostatic adjustment is likely less than ∼0.5mm yr −1 in the east component. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Ice Shelf eCite UTAS (University of Tasmania) Antarctic Antarctic Peninsula The Antarctic Geophysical Journal International 222 2 1013 1022 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Geophysics Geodesy |
spellingShingle |
Earth Sciences Geophysics Geodesy Samrat, NH King, MA Watson, C Hooper, A Chen, X Barletta, VR Bordoni, A Reduced ice mass loss and three-dimensional viscoelastic deformation in northern Antarctic Peninsula inferred from GPS |
topic_facet |
Earth Sciences Geophysics Geodesy |
description |
We consider the viscoelastic rheology of the solid Earth under the Antarctic Peninsula due to ice mass loss that commenced after the breakup of the Larsen-B ice shelf. We extend the previous analysis of nearby continuous GPS time-series to include five additional years and the additional consideration of the horizontal components of deformation. They show strong uplift from ∼2002 to 2011 followed by reduced uplift rates to 2018. Modelling the GPS-derived uplift as a viscoelastic response to ongoing regional ice unloading from a new ice model confirms earlier estimates of low upper-mantle viscosities of ∼0.33 10 18 Pa s in this region but allows a wide range of elastic lithosphere thickness. The observed and modelled north coordinate component shows little nonlinear variation due to the location of ice mass change to the east of the GPS sites. However, comparison of the observed and modelled east coordinate component constrains the upper-mantle viscosity to be less than ∼9 10 18 Pa s, consistent with the viscosity range suggested by the uplift rates alone and providing important, largely independent, confirmation of that result. Our horizontal analysis showed only marginal sensitivity to modelled lithospheric thickness. The results for the horizontal components are sensitive to the adopted plate rotation model, with the estimate based on ITRF2014 suggesting that the sum of residual plate motion and pre-2002 glacial isostatic adjustment is likely less than ∼0.5mm yr −1 in the east component. |
format |
Article in Journal/Newspaper |
author |
Samrat, NH King, MA Watson, C Hooper, A Chen, X Barletta, VR Bordoni, A |
author_facet |
Samrat, NH King, MA Watson, C Hooper, A Chen, X Barletta, VR Bordoni, A |
author_sort |
Samrat, NH |
title |
Reduced ice mass loss and three-dimensional viscoelastic deformation in northern Antarctic Peninsula inferred from GPS |
title_short |
Reduced ice mass loss and three-dimensional viscoelastic deformation in northern Antarctic Peninsula inferred from GPS |
title_full |
Reduced ice mass loss and three-dimensional viscoelastic deformation in northern Antarctic Peninsula inferred from GPS |
title_fullStr |
Reduced ice mass loss and three-dimensional viscoelastic deformation in northern Antarctic Peninsula inferred from GPS |
title_full_unstemmed |
Reduced ice mass loss and three-dimensional viscoelastic deformation in northern Antarctic Peninsula inferred from GPS |
title_sort |
reduced ice mass loss and three-dimensional viscoelastic deformation in northern antarctic peninsula inferred from gps |
publisher |
Blackwell Publishing Ltd |
publishDate |
2020 |
url |
https://doi.org/10.1093/gji/ggaa229 http://ecite.utas.edu.au/139276 |
geographic |
Antarctic Antarctic Peninsula The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Ice Shelf |
op_relation |
http://ecite.utas.edu.au/139276/1/139276 - Reduced ice mass loss and three-dimensional viscoelastic deformation in northern Antarctic Peninsula inferred from GPS.pdf http://dx.doi.org/10.1093/gji/ggaa229 Samrat, NH and King, MA and Watson, C and Hooper, A and Chen, X and Barletta, VR and Bordoni, A, Reduced ice mass loss and three-dimensional viscoelastic deformation in northern Antarctic Peninsula inferred from GPS, Geophysical Journal International, 222, (2) pp. 1013-1023. ISSN 0956-540X (2020) [Refereed Article] http://ecite.utas.edu.au/139276 |
op_doi |
https://doi.org/10.1093/gji/ggaa229 |
container_title |
Geophysical Journal International |
container_volume |
222 |
container_issue |
2 |
container_start_page |
1013 |
op_container_end_page |
1022 |
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1766171136399245312 |