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 5 additional years and the additional consideration...
Published in: | Geophysical Journal International |
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2020
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Online Access: | https://orbit.dtu.dk/en/publications/98c049d6-f184-44cb-b3c7-40634e59a761 https://doi.org/10.1093/gji/ggaa229 https://backend.orbit.dtu.dk/ws/files/222643520/ggaa229.pdf |
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ftdtupubl:oai:pure.atira.dk:publications/98c049d6-f184-44cb-b3c7-40634e59a761 2024-09-09T19:02:02+00:00 Reduced ice mass loss and three-dimensional viscoelastic deformation in northern Antarctic Peninsula inferred from GPS Samrat, Nahidul Hoque King, Matt A Watson, Christopher Hooper, Andrew Chen, Xianyao Barletta, Valentina R. Bordoni, Andrea 2020 application/pdf https://orbit.dtu.dk/en/publications/98c049d6-f184-44cb-b3c7-40634e59a761 https://doi.org/10.1093/gji/ggaa229 https://backend.orbit.dtu.dk/ws/files/222643520/ggaa229.pdf eng eng https://orbit.dtu.dk/en/publications/98c049d6-f184-44cb-b3c7-40634e59a761 info:eu-repo/semantics/openAccess Samrat , N H , King , M A , Watson , C , Hooper , A , Chen , X , Barletta , V R & Bordoni , A 2020 , ' Reduced ice mass loss and three-dimensional viscoelastic deformation in northern Antarctic Peninsula inferred from GPS ' , Geophysical Journal International , vol. 222 , no. 2 , pp. 1013-1022 . https://doi.org/10.1093/gji/ggaa229 Space geodetic surveys Satellite geodesy Dynamics of lithosphere and mantle Rheology: crust and lithosphere Rheology Mantle Antarctica article 2020 ftdtupubl https://doi.org/10.1093/gji/ggaa229 2024-06-18T14:52:18Z 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 5 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. Modeling 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 ∼0.3–3 × 10 18 Pa s in this region but allows a wide range of elastic lithosphere thickness. The observed and modeled north coordinate component shows little non-linear variation due to the location of ice mass change to the east of the GPS sites. However, comparison of the observed and modeled 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 modeled 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 GIA is likely less than ∼±0.5 mm/year in the east component. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Ice Shelf Technical University of Denmark: DTU Orbit Antarctic Antarctic Peninsula The Antarctic Geophysical Journal International 222 2 1013 1022 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
topic |
Space geodetic surveys Satellite geodesy Dynamics of lithosphere and mantle Rheology: crust and lithosphere Rheology Mantle Antarctica |
spellingShingle |
Space geodetic surveys Satellite geodesy Dynamics of lithosphere and mantle Rheology: crust and lithosphere Rheology Mantle Antarctica Samrat, Nahidul Hoque King, Matt A Watson, Christopher Hooper, Andrew Chen, Xianyao Barletta, Valentina R. Bordoni, Andrea Reduced ice mass loss and three-dimensional viscoelastic deformation in northern Antarctic Peninsula inferred from GPS |
topic_facet |
Space geodetic surveys Satellite geodesy Dynamics of lithosphere and mantle Rheology: crust and lithosphere Rheology Mantle Antarctica |
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 5 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. Modeling 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 ∼0.3–3 × 10 18 Pa s in this region but allows a wide range of elastic lithosphere thickness. The observed and modeled north coordinate component shows little non-linear variation due to the location of ice mass change to the east of the GPS sites. However, comparison of the observed and modeled 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 modeled 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 GIA is likely less than ∼±0.5 mm/year in the east component. |
format |
Article in Journal/Newspaper |
author |
Samrat, Nahidul Hoque King, Matt A Watson, Christopher Hooper, Andrew Chen, Xianyao Barletta, Valentina R. Bordoni, Andrea |
author_facet |
Samrat, Nahidul Hoque King, Matt A Watson, Christopher Hooper, Andrew Chen, Xianyao Barletta, Valentina R. Bordoni, Andrea |
author_sort |
Samrat, Nahidul Hoque |
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 |
publishDate |
2020 |
url |
https://orbit.dtu.dk/en/publications/98c049d6-f184-44cb-b3c7-40634e59a761 https://doi.org/10.1093/gji/ggaa229 https://backend.orbit.dtu.dk/ws/files/222643520/ggaa229.pdf |
geographic |
Antarctic Antarctic Peninsula The Antarctic |
geographic_facet |
Antarctic Antarctic Peninsula The Antarctic |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Shelf |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Ice Shelf |
op_source |
Samrat , N H , King , M A , Watson , C , Hooper , A , Chen , X , Barletta , V R & Bordoni , A 2020 , ' Reduced ice mass loss and three-dimensional viscoelastic deformation in northern Antarctic Peninsula inferred from GPS ' , Geophysical Journal International , vol. 222 , no. 2 , pp. 1013-1022 . https://doi.org/10.1093/gji/ggaa229 |
op_relation |
https://orbit.dtu.dk/en/publications/98c049d6-f184-44cb-b3c7-40634e59a761 |
op_rights |
info:eu-repo/semantics/openAccess |
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 |
_version_ |
1809816307314458624 |