Ocean tidal loading affecting precise geodetic observations on Greenland: Error account of surface deformations by tidal gravity measurements
Air-borne and satellite based altimetry are used to monitor the Greenland ice-cap. Since these measurements are related to fiducial sites at the coast, the robustness of the height differences depends on the stability of these reference points. To benefit from the accuracy of these methods on the ce...
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ftdtupubl:oai:pure.atira.dk:publications/bed2ec3d-6cff-4e40-8da8-037ddce24ba8 2023-07-23T04:19:29+02:00 Ocean tidal loading affecting precise geodetic observations on Greenland: Error account of surface deformations by tidal gravity measurements Jentzsch, G. Knudsen, Per Ramatschi, M. 2000 https://orbit.dtu.dk/en/publications/bed2ec3d-6cff-4e40-8da8-037ddce24ba8 eng eng info:eu-repo/semantics/restrictedAccess Jentzsch , G , Knudsen , P & Ramatschi , M 2000 , ' Ocean tidal loading affecting precise geodetic observations on Greenland: Error account of surface deformations by tidal gravity measurements ' , Physics and Chemistry of the Earth - Part A - Solid Earth and Geodesy , vol. 25 , no. 4 , pp. 401-407 . article 2000 ftdtupubl 2023-07-05T22:55:48Z Air-borne and satellite based altimetry are used to monitor the Greenland ice-cap. Since these measurements are related to fiducial sites at the coast, the robustness of the height differences depends on the stability of these reference points. To benefit from the accuracy of these methods on the centimeter level, station corrections regarding the Earth tides and the ocean tidal loading have to be applied. Models for global corrections esp. for the body tides are available and sufficient, but local corrections regarding the effect of the adjacent shelf area still have to be inferred from additional observations. Near the coast ocean tidal loading causes additional vertical deformations in the order of 1 to 10 cm Therefore, tidal gravity measurements were carried out at four fiducial sites around Greenland in order to provide corrections for the kinematic part of the coordinates of these sites. Starting in 1993 four stations were occupied on Greenland for a one year record each. The results show the expected strong tidal anomalies due to ocean tidal loading. The loading computations confirmed these observations, but it turned out that with global models only about 50 % of the observed effect can be explained. This means that at these stations st vertical deformation of up to +/-3.5 cm is not corrected applying these global models. Article in Journal/Newspaper Greenland Ice cap Technical University of Denmark: DTU Orbit Greenland |
institution |
Open Polar |
collection |
Technical University of Denmark: DTU Orbit |
op_collection_id |
ftdtupubl |
language |
English |
description |
Air-borne and satellite based altimetry are used to monitor the Greenland ice-cap. Since these measurements are related to fiducial sites at the coast, the robustness of the height differences depends on the stability of these reference points. To benefit from the accuracy of these methods on the centimeter level, station corrections regarding the Earth tides and the ocean tidal loading have to be applied. Models for global corrections esp. for the body tides are available and sufficient, but local corrections regarding the effect of the adjacent shelf area still have to be inferred from additional observations. Near the coast ocean tidal loading causes additional vertical deformations in the order of 1 to 10 cm Therefore, tidal gravity measurements were carried out at four fiducial sites around Greenland in order to provide corrections for the kinematic part of the coordinates of these sites. Starting in 1993 four stations were occupied on Greenland for a one year record each. The results show the expected strong tidal anomalies due to ocean tidal loading. The loading computations confirmed these observations, but it turned out that with global models only about 50 % of the observed effect can be explained. This means that at these stations st vertical deformation of up to +/-3.5 cm is not corrected applying these global models. |
format |
Article in Journal/Newspaper |
author |
Jentzsch, G. Knudsen, Per Ramatschi, M. |
spellingShingle |
Jentzsch, G. Knudsen, Per Ramatschi, M. Ocean tidal loading affecting precise geodetic observations on Greenland: Error account of surface deformations by tidal gravity measurements |
author_facet |
Jentzsch, G. Knudsen, Per Ramatschi, M. |
author_sort |
Jentzsch, G. |
title |
Ocean tidal loading affecting precise geodetic observations on Greenland: Error account of surface deformations by tidal gravity measurements |
title_short |
Ocean tidal loading affecting precise geodetic observations on Greenland: Error account of surface deformations by tidal gravity measurements |
title_full |
Ocean tidal loading affecting precise geodetic observations on Greenland: Error account of surface deformations by tidal gravity measurements |
title_fullStr |
Ocean tidal loading affecting precise geodetic observations on Greenland: Error account of surface deformations by tidal gravity measurements |
title_full_unstemmed |
Ocean tidal loading affecting precise geodetic observations on Greenland: Error account of surface deformations by tidal gravity measurements |
title_sort |
ocean tidal loading affecting precise geodetic observations on greenland: error account of surface deformations by tidal gravity measurements |
publishDate |
2000 |
url |
https://orbit.dtu.dk/en/publications/bed2ec3d-6cff-4e40-8da8-037ddce24ba8 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice cap |
genre_facet |
Greenland Ice cap |
op_source |
Jentzsch , G , Knudsen , P & Ramatschi , M 2000 , ' Ocean tidal loading affecting precise geodetic observations on Greenland: Error account of surface deformations by tidal gravity measurements ' , Physics and Chemistry of the Earth - Part A - Solid Earth and Geodesy , vol. 25 , no. 4 , pp. 401-407 . |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1772182625813790720 |