Large-scale ice-sheet modelling as a means of dating deep ice cores in Greenland
The three-dimensional ice-sheet model SIC OPOLIS is used to simulate the dynamic/thermodynamic behaviour of the entire Greenland ice sheet from 250000 a BP until today. External forcing consists of a surface-temperature history constructed from δ18O data of the GRIP core, a snowfall history coupled...
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fthokunivhus:oai:eprints.lib.hokudai.ac.jp:2115/47796 2023-05-15T16:26:02+02:00 Large-scale ice-sheet modelling as a means of dating deep ice cores in Greenland Greve, Ralf http://hdl.handle.net/2115/47796 eng eng International Glaciological Society http://www.igsoc.org/ http://hdl.handle.net/2115/47796 Journal of Glaciology, 43(144): 307-310 © 1997 International Glaciological Society Greenland Ice sheet Ice core Dating Modelling 452 article fthokunivhus 2022-11-18T01:02:18Z The three-dimensional ice-sheet model SIC OPOLIS is used to simulate the dynamic/thermodynamic behaviour of the entire Greenland ice sheet from 250000 a BP until today. External forcing consists of a surface-temperature history constructed from δ18O 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. T he 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 28 km 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 be 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 core Ice Sheet Journal of Glaciology Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) Greenland |
institution |
Open Polar |
collection |
Hokkaido University Collection of Scholarly and Academic Papers (HUSCAP) |
op_collection_id |
fthokunivhus |
language |
English |
topic |
Greenland Ice sheet Ice core Dating Modelling 452 |
spellingShingle |
Greenland Ice sheet Ice core Dating Modelling 452 Greve, Ralf Large-scale ice-sheet modelling as a means of dating deep ice cores in Greenland |
topic_facet |
Greenland Ice sheet Ice core Dating Modelling 452 |
description |
The three-dimensional ice-sheet model SIC OPOLIS is used to simulate the dynamic/thermodynamic behaviour of the entire Greenland ice sheet from 250000 a BP until today. External forcing consists of a surface-temperature history constructed from δ18O 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. T he 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 28 km 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 be 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 |
International Glaciological Society |
url |
http://hdl.handle.net/2115/47796 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland GRIP ice core Ice Sheet Journal of Glaciology |
genre_facet |
Greenland GRIP ice core Ice Sheet Journal of Glaciology |
op_relation |
http://www.igsoc.org/ http://hdl.handle.net/2115/47796 Journal of Glaciology, 43(144): 307-310 |
op_rights |
© 1997 International Glaciological Society |
_version_ |
1766014891557126144 |