Modeled and observed bedrock displacements in north‐east Greenland using refined estimates of present‐day ice‐mass changes and densified GNSS measurements
Models of the glacial‐isostatic adjustment (GIA) to past ice‐mass changes exhibit large differences in north‐east Greenland owing to insufficient knowledge about glacial history and Earth rheology. The GIA uncertainties feed back to uncertainties in present‐day mass‐balance estimates from satellite...
Published in: | Journal of Geophysical Research: Earth Surface |
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2021
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ftdtupubl:oai:pure.atira.dk:publications/848143c9-6bef-4b40-af85-de5248da90b6 2024-09-15T18:04:13+00:00 Modeled and observed bedrock displacements in north‐east Greenland using refined estimates of present‐day ice‐mass changes and densified GNSS measurements Kappelsberger, M. T. Strößenreuther, U. Scheinert, M. Horwath, M. Groh, A. Knöfel, C. Lunz, S. Khan, S. A. 2021 application/pdf https://orbit.dtu.dk/en/publications/848143c9-6bef-4b40-af85-de5248da90b6 https://doi.org/10.1029/2020JF005860 https://backend.orbit.dtu.dk/ws/files/247151424/2020JF005860.pdf eng eng https://orbit.dtu.dk/en/publications/848143c9-6bef-4b40-af85-de5248da90b6 info:eu-repo/semantics/openAccess Kappelsberger , M T , Strößenreuther , U , Scheinert , M , Horwath , M , Groh , A , Knöfel , C , Lunz , S & Khan , S A 2021 , ' Modeled and observed bedrock displacements in north‐east Greenland using refined estimates of present‐day ice‐mass changes and densified GNSS measurements ' , Journal of Geophysical Research: Earth Surface , vol. 126 , no. 4 , e2020JF005860 . https://doi.org/10.1029/2020JF005860 article 2021 ftdtupubl https://doi.org/10.1029/2020JF005860 2024-08-13T00:03:06Z Models of the glacial‐isostatic adjustment (GIA) to past ice‐mass changes exhibit large differences in north‐east Greenland owing to insufficient knowledge about glacial history and Earth rheology. The GIA uncertainties feed back to uncertainties in present‐day mass‐balance estimates from satellite gravimetry. Geodetic Global Navigation Satellite System (GNSS) measurements allow to directly observe displacement of bedrock. We present results from repeated and continuous GNSS measurements conducted within five measurement campaigns between 2008 and 2017. We used the observed uplift rates to validate different GIA models in conjunction with estimates of the elastic response of the solid Earth to present‐day ice‐mass changes. To determine present‐day ice‐mass changes and the associated elastic deformations, we combined satellite altimetry data from CryoSat‐2 with satellite gravimetry data from the Gravity Recovery and Climate Experiment (GRACE) for the entire Greenland Ice Sheet (GrIS) and included peripheral glaciers and ice caps. The different GIA models were consistently used in all processing steps. The GNSS measurements in north‐east Greenland revealed uplift rates in the range of 2.8 mm yr −1 to 8.9 mm yr −1 . The comparison of the total displacement predicted by GIA and elastic modeling with the GNSS‐based displacement clearly favors GIA models that show low rates (0.7 mm yr −1 to 4.4 mm yr −1 at the GNSS sites) against GIA models with higher rates of up to 8.3 mm yr −1 . The correction due to the favored GIA model in north‐east Greenland results in an ice‐mass loss of 233 ± 43 Gt yr −1 for the GrIS including peripheral glaciers over the period July 2010 to June 2017. Article in Journal/Newspaper East Greenland Greenland Ice Sheet Technical University of Denmark: DTU Orbit Journal of Geophysical Research: Earth Surface 126 4 |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
description |
Models of the glacial‐isostatic adjustment (GIA) to past ice‐mass changes exhibit large differences in north‐east Greenland owing to insufficient knowledge about glacial history and Earth rheology. The GIA uncertainties feed back to uncertainties in present‐day mass‐balance estimates from satellite gravimetry. Geodetic Global Navigation Satellite System (GNSS) measurements allow to directly observe displacement of bedrock. We present results from repeated and continuous GNSS measurements conducted within five measurement campaigns between 2008 and 2017. We used the observed uplift rates to validate different GIA models in conjunction with estimates of the elastic response of the solid Earth to present‐day ice‐mass changes. To determine present‐day ice‐mass changes and the associated elastic deformations, we combined satellite altimetry data from CryoSat‐2 with satellite gravimetry data from the Gravity Recovery and Climate Experiment (GRACE) for the entire Greenland Ice Sheet (GrIS) and included peripheral glaciers and ice caps. The different GIA models were consistently used in all processing steps. The GNSS measurements in north‐east Greenland revealed uplift rates in the range of 2.8 mm yr −1 to 8.9 mm yr −1 . The comparison of the total displacement predicted by GIA and elastic modeling with the GNSS‐based displacement clearly favors GIA models that show low rates (0.7 mm yr −1 to 4.4 mm yr −1 at the GNSS sites) against GIA models with higher rates of up to 8.3 mm yr −1 . The correction due to the favored GIA model in north‐east Greenland results in an ice‐mass loss of 233 ± 43 Gt yr −1 for the GrIS including peripheral glaciers over the period July 2010 to June 2017. |
format |
Article in Journal/Newspaper |
author |
Kappelsberger, M. T. Strößenreuther, U. Scheinert, M. Horwath, M. Groh, A. Knöfel, C. Lunz, S. Khan, S. A. |
spellingShingle |
Kappelsberger, M. T. Strößenreuther, U. Scheinert, M. Horwath, M. Groh, A. Knöfel, C. Lunz, S. Khan, S. A. Modeled and observed bedrock displacements in north‐east Greenland using refined estimates of present‐day ice‐mass changes and densified GNSS measurements |
author_facet |
Kappelsberger, M. T. Strößenreuther, U. Scheinert, M. Horwath, M. Groh, A. Knöfel, C. Lunz, S. Khan, S. A. |
author_sort |
Kappelsberger, M. T. |
title |
Modeled and observed bedrock displacements in north‐east Greenland using refined estimates of present‐day ice‐mass changes and densified GNSS measurements |
title_short |
Modeled and observed bedrock displacements in north‐east Greenland using refined estimates of present‐day ice‐mass changes and densified GNSS measurements |
title_full |
Modeled and observed bedrock displacements in north‐east Greenland using refined estimates of present‐day ice‐mass changes and densified GNSS measurements |
title_fullStr |
Modeled and observed bedrock displacements in north‐east Greenland using refined estimates of present‐day ice‐mass changes and densified GNSS measurements |
title_full_unstemmed |
Modeled and observed bedrock displacements in north‐east Greenland using refined estimates of present‐day ice‐mass changes and densified GNSS measurements |
title_sort |
modeled and observed bedrock displacements in north‐east greenland using refined estimates of present‐day ice‐mass changes and densified gnss measurements |
publishDate |
2021 |
url |
https://orbit.dtu.dk/en/publications/848143c9-6bef-4b40-af85-de5248da90b6 https://doi.org/10.1029/2020JF005860 https://backend.orbit.dtu.dk/ws/files/247151424/2020JF005860.pdf |
genre |
East Greenland Greenland Ice Sheet |
genre_facet |
East Greenland Greenland Ice Sheet |
op_source |
Kappelsberger , M T , Strößenreuther , U , Scheinert , M , Horwath , M , Groh , A , Knöfel , C , Lunz , S & Khan , S A 2021 , ' Modeled and observed bedrock displacements in north‐east Greenland using refined estimates of present‐day ice‐mass changes and densified GNSS measurements ' , Journal of Geophysical Research: Earth Surface , vol. 126 , no. 4 , e2020JF005860 . https://doi.org/10.1029/2020JF005860 |
op_relation |
https://orbit.dtu.dk/en/publications/848143c9-6bef-4b40-af85-de5248da90b6 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2020JF005860 |
container_title |
Journal of Geophysical Research: Earth Surface |
container_volume |
126 |
container_issue |
4 |
_version_ |
1810441710671495168 |