Glacial rebound of the British Isles--II. A high-resolution, high-precision model
Observations of ice movements across the British Isles and of sea-level changes around the shorelines during Late Devensian time (after about 25 000 yr BP) have been used to establish a high spatial and temporal resolution model for the rebound of Great Britain and associated sea-level change. The s...
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1993
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fthighwire:oai:open-archive.highwire.org:gji:115/3/960 2023-05-15T16:40:43+02:00 Glacial rebound of the British Isles--II. A high-resolution, high-precision model Lambeck, Kurt 1993-12-01 00:00:00.0 text/html http://gji.oxfordjournals.org/cgi/content/short/115/3/960 https://doi.org/10.1111/j.1365-246X.1993.tb01504.x en eng Oxford University Press http://gji.oxfordjournals.org/cgi/content/short/115/3/960 http://dx.doi.org/10.1111/j.1365-246X.1993.tb01504.x Copyright (C) 1993, Oxford University Press Articles TEXT 1993 fthighwire https://doi.org/10.1111/j.1365-246X.1993.tb01504.x 2016-11-16T17:05:51Z Observations of ice movements across the British Isles and of sea-level changes around the shorelines during Late Devensian time (after about 25 000 yr BP) have been used to establish a high spatial and temporal resolution model for the rebound of Great Britain and associated sea-level change. The sea-level observations include sites within the margins of the former ice sheet as well as observations outside the glaciated regions such that it has been possible to separate unknown earth model parameters from some ice-sheet model parameters in the inversion of the glacio-hydro-isostatic equations. The mantle viscosity profile is approximated by a number of radially symmetric layers representing the lithosphere, the upper mantle as two layers from the base of the lithosphere to the phase transition boundary at 400 km, the transition zone down to 670 km depth, and the lower mantle. No evidence is found to support a strong layering in viscosity above 670 km other than the high-viscosity lithospheric layer. Models with a low-viscosity zone in the upper mantle or models with a marked higher viscosity in the transition zone are less satisfactory than models in which the viscosity is constant from the base of the lithosphere to the 670 km boundary. In contrast, a marked increase in viscosity is required across this latter boundary. The optimum effective parameters for the mantle beneath Great Britain are: a lithospheric thickness of about 65 km, a mantle viscosity above 670 km of about (4–5) 1020 Pa s, and a viscosity below 670 km greater than 4 × 1021 Pa s. Text Ice Sheet HighWire Press (Stanford University) Geophysical Journal International 115 3 960 990 |
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Articles Lambeck, Kurt Glacial rebound of the British Isles--II. A high-resolution, high-precision model |
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description |
Observations of ice movements across the British Isles and of sea-level changes around the shorelines during Late Devensian time (after about 25 000 yr BP) have been used to establish a high spatial and temporal resolution model for the rebound of Great Britain and associated sea-level change. The sea-level observations include sites within the margins of the former ice sheet as well as observations outside the glaciated regions such that it has been possible to separate unknown earth model parameters from some ice-sheet model parameters in the inversion of the glacio-hydro-isostatic equations. The mantle viscosity profile is approximated by a number of radially symmetric layers representing the lithosphere, the upper mantle as two layers from the base of the lithosphere to the phase transition boundary at 400 km, the transition zone down to 670 km depth, and the lower mantle. No evidence is found to support a strong layering in viscosity above 670 km other than the high-viscosity lithospheric layer. Models with a low-viscosity zone in the upper mantle or models with a marked higher viscosity in the transition zone are less satisfactory than models in which the viscosity is constant from the base of the lithosphere to the 670 km boundary. In contrast, a marked increase in viscosity is required across this latter boundary. The optimum effective parameters for the mantle beneath Great Britain are: a lithospheric thickness of about 65 km, a mantle viscosity above 670 km of about (4–5) 1020 Pa s, and a viscosity below 670 km greater than 4 × 1021 Pa s. |
format |
Text |
author |
Lambeck, Kurt |
author_facet |
Lambeck, Kurt |
author_sort |
Lambeck, Kurt |
title |
Glacial rebound of the British Isles--II. A high-resolution, high-precision model |
title_short |
Glacial rebound of the British Isles--II. A high-resolution, high-precision model |
title_full |
Glacial rebound of the British Isles--II. A high-resolution, high-precision model |
title_fullStr |
Glacial rebound of the British Isles--II. A high-resolution, high-precision model |
title_full_unstemmed |
Glacial rebound of the British Isles--II. A high-resolution, high-precision model |
title_sort |
glacial rebound of the british isles--ii. a high-resolution, high-precision model |
publisher |
Oxford University Press |
publishDate |
1993 |
url |
http://gji.oxfordjournals.org/cgi/content/short/115/3/960 https://doi.org/10.1111/j.1365-246X.1993.tb01504.x |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
http://gji.oxfordjournals.org/cgi/content/short/115/3/960 http://dx.doi.org/10.1111/j.1365-246X.1993.tb01504.x |
op_rights |
Copyright (C) 1993, Oxford University Press |
op_doi |
https://doi.org/10.1111/j.1365-246X.1993.tb01504.x |
container_title |
Geophysical Journal International |
container_volume |
115 |
container_issue |
3 |
container_start_page |
960 |
op_container_end_page |
990 |
_version_ |
1766031123413991424 |