Glacial isostatic adjustment and sea level change near Berkner Island, Antarctica
The glacial-isostatic adjustment in Iceland resulting from the recent melting of the Vatnajökull ice cap is controlled by the viscosity distribution in the earth's interior and by the details of the melting history. Interpretations of the results of GPS and gravity measuring campaigns in the ti...
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ftdatacite:10.23689/fidgeo-557 2023-05-15T13:44:15+02:00 Glacial isostatic adjustment and sea level change near Berkner Island, Antarctica Sasgen, Ingo 2007 https://dx.doi.org/10.23689/fidgeo-557 https://e-docs.geo-leo.de/handle/11858/00-1735-0000-0001-32BD-1 en eng GFZ, Helmholtz-Zentrum Text Article article-journal ScholarlyArticle 2007 ftdatacite https://doi.org/10.23689/fidgeo-557 2021-11-05T12:55:41Z The glacial-isostatic adjustment in Iceland resulting from the recent melting of the Vatnajökull ice cap is controlled by the viscosity distribution in the earth's interior and by the details of the melting history. Interpretations of the results of GPS and gravity measuring campaigns in the time interval 1991-2000 and 1992-1999, respectively, by means of laterally homogeneous earth models for the determination of the lithosphere thickness, the asthenosphere thickness and the asthenosphere viscosity have so far been not fully satisfactory. In particular near the ice margin, the fitting of the computed land uplift and gravity change to the observational data was inadequate, which may be related to the neglegt of the Iceland plume in the laterally homogeneous earth models. In the present study, a program package is used for the modelling of the land uplift and gravity change that allows the computation of load-induced perturbations of a Maxwell-viscoelastic, incompressible, self-gravitating, spherical earth model. To simulate the presence of the plume below the Vatnajökull, an axisymmetric viscosity distribution is used, where the plume radius and the plume viscosity are free parameters. Based on seismic results, a 6-km-thick lithosphere is assumed above the plume, which thickens to 35 km in the peripheral region of the plume. The melting history of the Vatnajökull is founded on interpretations of geomorphological and climatological investigations and is simulated by a load co-axial with the plume with parabolic profile and time-dependent radius. The results of the modelling favour a plume radius of ~80 km and a plume viscosity of (0.3-1.0) x 10^{18} Pa s. : report Text Antarc* Antarctica Berkner Island Ice cap Iceland Vatnajökull DataCite Metadata Store (German National Library of Science and Technology) Berkner Island ENVELOPE(-48.117,-48.117,-79.333,-79.333) Vatnajökull ENVELOPE(-16.823,-16.823,64.420,64.420) |
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DataCite Metadata Store (German National Library of Science and Technology) |
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ftdatacite |
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English |
description |
The glacial-isostatic adjustment in Iceland resulting from the recent melting of the Vatnajökull ice cap is controlled by the viscosity distribution in the earth's interior and by the details of the melting history. Interpretations of the results of GPS and gravity measuring campaigns in the time interval 1991-2000 and 1992-1999, respectively, by means of laterally homogeneous earth models for the determination of the lithosphere thickness, the asthenosphere thickness and the asthenosphere viscosity have so far been not fully satisfactory. In particular near the ice margin, the fitting of the computed land uplift and gravity change to the observational data was inadequate, which may be related to the neglegt of the Iceland plume in the laterally homogeneous earth models. In the present study, a program package is used for the modelling of the land uplift and gravity change that allows the computation of load-induced perturbations of a Maxwell-viscoelastic, incompressible, self-gravitating, spherical earth model. To simulate the presence of the plume below the Vatnajökull, an axisymmetric viscosity distribution is used, where the plume radius and the plume viscosity are free parameters. Based on seismic results, a 6-km-thick lithosphere is assumed above the plume, which thickens to 35 km in the peripheral region of the plume. The melting history of the Vatnajökull is founded on interpretations of geomorphological and climatological investigations and is simulated by a load co-axial with the plume with parabolic profile and time-dependent radius. The results of the modelling favour a plume radius of ~80 km and a plume viscosity of (0.3-1.0) x 10^{18} Pa s. : report |
format |
Text |
author |
Sasgen, Ingo |
spellingShingle |
Sasgen, Ingo Glacial isostatic adjustment and sea level change near Berkner Island, Antarctica |
author_facet |
Sasgen, Ingo |
author_sort |
Sasgen, Ingo |
title |
Glacial isostatic adjustment and sea level change near Berkner Island, Antarctica |
title_short |
Glacial isostatic adjustment and sea level change near Berkner Island, Antarctica |
title_full |
Glacial isostatic adjustment and sea level change near Berkner Island, Antarctica |
title_fullStr |
Glacial isostatic adjustment and sea level change near Berkner Island, Antarctica |
title_full_unstemmed |
Glacial isostatic adjustment and sea level change near Berkner Island, Antarctica |
title_sort |
glacial isostatic adjustment and sea level change near berkner island, antarctica |
publisher |
GFZ, Helmholtz-Zentrum |
publishDate |
2007 |
url |
https://dx.doi.org/10.23689/fidgeo-557 https://e-docs.geo-leo.de/handle/11858/00-1735-0000-0001-32BD-1 |
long_lat |
ENVELOPE(-48.117,-48.117,-79.333,-79.333) ENVELOPE(-16.823,-16.823,64.420,64.420) |
geographic |
Berkner Island Vatnajökull |
geographic_facet |
Berkner Island Vatnajökull |
genre |
Antarc* Antarctica Berkner Island Ice cap Iceland Vatnajökull |
genre_facet |
Antarc* Antarctica Berkner Island Ice cap Iceland Vatnajökull |
op_doi |
https://doi.org/10.23689/fidgeo-557 |
_version_ |
1766199463947272192 |