Large-scale ice-sheet modelling as a means of dating deep ice cores in Greenland
Abstract The three-dimensional ice-sheet model SICOPOLIS is used to simulate the dynamic/thermody namic behaviour of the entire Greenland ice sheet from 250 000 a BP until today. External forcing consists of a surface-temperature history constructed from δ 18 O data of the GRIP core, a snowfall hist...
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Cambridge University Press (CUP)
1997
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Online Access: | http://dx.doi.org/10.1017/s0022143000003257 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003257 |
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crcambridgeupr:10.1017/s0022143000003257 2024-03-03T08:44:56+00:00 Large-scale ice-sheet modelling as a means of dating deep ice cores in Greenland Greve, Ralf 1997 http://dx.doi.org/10.1017/s0022143000003257 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003257 en eng Cambridge University Press (CUP) Journal of Glaciology volume 43, issue 144, page 307-310 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1997 crcambridgeupr https://doi.org/10.1017/s0022143000003257 2024-02-08T08:47:47Z Abstract The three-dimensional ice-sheet model SICOPOLIS is used to simulate the dynamic/thermody namic behaviour of the entire Greenland ice sheet from 250 000 a BP until today. External forcing consists of a surface-temperature history constructed from δ 18 O data of the GRIP core, a snowfall history coupled linearly to that of the surface temperature, a piecewise linear sea-level scenario and a constant geothermal heat flux. The simulated Greenland ice sheet is investigated in the vicinity of Summit, the position where the maximum elevation is taken, and where the two drill sites GRIP and GISP2 are situated 28km apart from each other. In this region, the agreement between modelled and observed topography and ice temperature turns out to be very good. Computed age-depth profiles for GRIP and GISP2 are presented, which can he used to complete the dating of these cores in the deeper regions where annual-layer counting is not possible. However, artificial diffusion influences the computed ages in a near-basal boundary layer of approximately 15% of the ice thickness, so that the age at the bottom of the cores cannot be predicted yet. Article in Journal/Newspaper Greenland GRIP Ice Sheet Journal of Glaciology Cambridge University Press Greenland Journal of Glaciology 43 144 307 310 |
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Open Polar |
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Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Earth-Surface Processes |
spellingShingle |
Earth-Surface Processes Greve, Ralf Large-scale ice-sheet modelling as a means of dating deep ice cores in Greenland |
topic_facet |
Earth-Surface Processes |
description |
Abstract The three-dimensional ice-sheet model SICOPOLIS is used to simulate the dynamic/thermody namic behaviour of the entire Greenland ice sheet from 250 000 a BP until today. External forcing consists of a surface-temperature history constructed from δ 18 O data of the GRIP core, a snowfall history coupled linearly to that of the surface temperature, a piecewise linear sea-level scenario and a constant geothermal heat flux. The simulated Greenland ice sheet is investigated in the vicinity of Summit, the position where the maximum elevation is taken, and where the two drill sites GRIP and GISP2 are situated 28km apart from each other. In this region, the agreement between modelled and observed topography and ice temperature turns out to be very good. Computed age-depth profiles for GRIP and GISP2 are presented, which can he used to complete the dating of these cores in the deeper regions where annual-layer counting is not possible. However, artificial diffusion influences the computed ages in a near-basal boundary layer of approximately 15% of the ice thickness, so that the age at the bottom of the cores cannot be predicted yet. |
format |
Article in Journal/Newspaper |
author |
Greve, Ralf |
author_facet |
Greve, Ralf |
author_sort |
Greve, Ralf |
title |
Large-scale ice-sheet modelling as a means of dating deep ice cores in Greenland |
title_short |
Large-scale ice-sheet modelling as a means of dating deep ice cores in Greenland |
title_full |
Large-scale ice-sheet modelling as a means of dating deep ice cores in Greenland |
title_fullStr |
Large-scale ice-sheet modelling as a means of dating deep ice cores in Greenland |
title_full_unstemmed |
Large-scale ice-sheet modelling as a means of dating deep ice cores in Greenland |
title_sort |
large-scale ice-sheet modelling as a means of dating deep ice cores in greenland |
publisher |
Cambridge University Press (CUP) |
publishDate |
1997 |
url |
http://dx.doi.org/10.1017/s0022143000003257 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000003257 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland GRIP Ice Sheet Journal of Glaciology |
genre_facet |
Greenland GRIP Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology volume 43, issue 144, page 307-310 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000003257 |
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Journal of Glaciology |
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43 |
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144 |
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307 |
op_container_end_page |
310 |
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1792500459594842112 |