Dating of Greenland Ice Cores by Flow Models, Isotopes, Volcanic Debris, and Continental Dust
Abstract The available methods for dating of ice cores are based on radioactive decay, ice-flow calculations, or stratigraphic observations. The two former categories are broadly outlined, and special emphasis is given to stratigraphic methods. Reference horizons are established back to A.D. 1783, i...
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Cambridge University Press (CUP)
1978
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Online Access: | http://dx.doi.org/10.1017/s0022143000021183 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000021183 |
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crcambridgeupr:10.1017/s0022143000021183 2024-03-03T08:44:32+00:00 Dating of Greenland Ice Cores by Flow Models, Isotopes, Volcanic Debris, and Continental Dust Hammer, C.U. Clausen, H. B. Dansgaard, W. Gundestrup, N. Johnsen, S. J. Reeh, N. 1978 http://dx.doi.org/10.1017/s0022143000021183 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000021183 en eng Cambridge University Press (CUP) Journal of Glaciology volume 20, issue 82, page 3-26 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1978 crcambridgeupr https://doi.org/10.1017/s0022143000021183 2024-02-08T08:34:04Z Abstract The available methods for dating of ice cores are based on radioactive decay, ice-flow calculations, or stratigraphic observations. The two former categories are broadly outlined, and special emphasis is given to stratigraphic methods. Reference horizons are established back to A.D. 1783, in the form of elevated electrical conductivities due to fallout of soluble volcanic debris. Seasonal variations in the concentrations of insoluble microparticles and/or stable isotopes are measured over the entire 400 m lengths of three ice cores, recovered by Greenland Ice Sheet Program (GISP). The resulting absolute time scales are probably accurate within a few years per thousand. Techniques are outlined for re-establishing the approximate, original shape of heavy-isotope profiles that have been more or less smoothed by diffusion in firn and ice. Annual-layer thickness measurements on 24 increments down to 1130 m depth in the Camp Century ice core determine a flow pattern, consistent with that suggested by Dansgaard and Johnsen (1969), and a Camp Century time scale with an estimated uncertainty better than 3% back to 10000 years B.P. Article in Journal/Newspaper GISP Greenland Greenland ice cores ice core Ice Sheet Journal of Glaciology Cambridge University Press Greenland Journal of Glaciology 20 82 3 26 |
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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 Hammer, C.U. Clausen, H. B. Dansgaard, W. Gundestrup, N. Johnsen, S. J. Reeh, N. Dating of Greenland Ice Cores by Flow Models, Isotopes, Volcanic Debris, and Continental Dust |
topic_facet |
Earth-Surface Processes |
description |
Abstract The available methods for dating of ice cores are based on radioactive decay, ice-flow calculations, or stratigraphic observations. The two former categories are broadly outlined, and special emphasis is given to stratigraphic methods. Reference horizons are established back to A.D. 1783, in the form of elevated electrical conductivities due to fallout of soluble volcanic debris. Seasonal variations in the concentrations of insoluble microparticles and/or stable isotopes are measured over the entire 400 m lengths of three ice cores, recovered by Greenland Ice Sheet Program (GISP). The resulting absolute time scales are probably accurate within a few years per thousand. Techniques are outlined for re-establishing the approximate, original shape of heavy-isotope profiles that have been more or less smoothed by diffusion in firn and ice. Annual-layer thickness measurements on 24 increments down to 1130 m depth in the Camp Century ice core determine a flow pattern, consistent with that suggested by Dansgaard and Johnsen (1969), and a Camp Century time scale with an estimated uncertainty better than 3% back to 10000 years B.P. |
format |
Article in Journal/Newspaper |
author |
Hammer, C.U. Clausen, H. B. Dansgaard, W. Gundestrup, N. Johnsen, S. J. Reeh, N. |
author_facet |
Hammer, C.U. Clausen, H. B. Dansgaard, W. Gundestrup, N. Johnsen, S. J. Reeh, N. |
author_sort |
Hammer, C.U. |
title |
Dating of Greenland Ice Cores by Flow Models, Isotopes, Volcanic Debris, and Continental Dust |
title_short |
Dating of Greenland Ice Cores by Flow Models, Isotopes, Volcanic Debris, and Continental Dust |
title_full |
Dating of Greenland Ice Cores by Flow Models, Isotopes, Volcanic Debris, and Continental Dust |
title_fullStr |
Dating of Greenland Ice Cores by Flow Models, Isotopes, Volcanic Debris, and Continental Dust |
title_full_unstemmed |
Dating of Greenland Ice Cores by Flow Models, Isotopes, Volcanic Debris, and Continental Dust |
title_sort |
dating of greenland ice cores by flow models, isotopes, volcanic debris, and continental dust |
publisher |
Cambridge University Press (CUP) |
publishDate |
1978 |
url |
http://dx.doi.org/10.1017/s0022143000021183 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000021183 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
GISP Greenland Greenland ice cores ice core Ice Sheet Journal of Glaciology |
genre_facet |
GISP Greenland Greenland ice cores ice core Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology volume 20, issue 82, page 3-26 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000021183 |
container_title |
Journal of Glaciology |
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20 |
container_issue |
82 |
container_start_page |
3 |
op_container_end_page |
26 |
_version_ |
1792500036908613632 |