Reconstruction and Disintegration of Ice Sheets for the Climap 18000 And 125000 Years b.p. Experiments: Results
Abstract Late-Wisconsin ice sheets were reconstructed for the CLIMAP 18000 years b.p. experiment. This experiment modeled the ice-age steady-state climate using boundary conditions that differed from present ones mainly in Earth-surface albedos, sea-surface areas, and land-surface topography. These...
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Online Access: | http://dx.doi.org/10.1017/s0022143000015069 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000015069 |
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crcambridgeupr:10.1017/s0022143000015069 2024-03-03T08:37:57+00:00 Reconstruction and Disintegration of Ice Sheets for the Climap 18000 And 125000 Years b.p. Experiments: Results Denton, G. H. Hughes, T. J. Fastook, J. L. Schilling, D. H. Lingle, C. S. 1979 http://dx.doi.org/10.1017/s0022143000015069 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000015069 en eng Cambridge University Press (CUP) Journal of Glaciology volume 24, issue 90, page 495-496 ISSN 0022-1430 1727-5652 Earth-Surface Processes journal-article 1979 crcambridgeupr https://doi.org/10.1017/s0022143000015069 2024-02-08T08:39:08Z Abstract Late-Wisconsin ice sheets were reconstructed for the CLIMAP 18000 years b.p. experiment. This experiment modeled the ice-age steady-state climate using boundary conditions that differed from present ones mainly in Earth-surface albedos, sea-surface areas, and land-surface topography. These required determinations of the area, volume, and elevation of Late Wisconsin ice sheets. An initial-value finite-difference numerical model for ice-sheet reconstruction was developed from a recursive formula which gave ice thickness for known variations of bed topography and theoretical variations of basal shear stress. Ice thicknesses were calculated in 50 km to 100 km steps along flow lines from margins to domes of late-Wisconsin ice sheets. We assumed that terrestrial margins were along the furthermost moraines, marine margins were along the present 500 m bathymetric contour, domes were centers of maximum post-glacial isostatic rebound, and flow lines were along glacial lineations (eskers, striations, drumlins, etc.) connecting margins to domes. At various locations ice-sheet margins were verified by dated moraines for terrestrial margins and Egga-type moraines for marine margins. Ice-sheet elevations and thicknesses were contoured from profiles reconstructed for 40 Antarctic flow lines and 137 Northern Hemisphere flow lines for a maximum ice-sheet extent, and 86 Northern Hemisphere flow lines for a minimum ice-sheet extent. Article in Journal/Newspaper Antarc* Antarctic Ice Sheet Journal of Glaciology Cambridge University Press Antarctic Egga ENVELOPE(14.802,14.802,68.830,68.830) Journal of Glaciology 24 90 495 496 |
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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 Denton, G. H. Hughes, T. J. Fastook, J. L. Schilling, D. H. Lingle, C. S. Reconstruction and Disintegration of Ice Sheets for the Climap 18000 And 125000 Years b.p. Experiments: Results |
topic_facet |
Earth-Surface Processes |
description |
Abstract Late-Wisconsin ice sheets were reconstructed for the CLIMAP 18000 years b.p. experiment. This experiment modeled the ice-age steady-state climate using boundary conditions that differed from present ones mainly in Earth-surface albedos, sea-surface areas, and land-surface topography. These required determinations of the area, volume, and elevation of Late Wisconsin ice sheets. An initial-value finite-difference numerical model for ice-sheet reconstruction was developed from a recursive formula which gave ice thickness for known variations of bed topography and theoretical variations of basal shear stress. Ice thicknesses were calculated in 50 km to 100 km steps along flow lines from margins to domes of late-Wisconsin ice sheets. We assumed that terrestrial margins were along the furthermost moraines, marine margins were along the present 500 m bathymetric contour, domes were centers of maximum post-glacial isostatic rebound, and flow lines were along glacial lineations (eskers, striations, drumlins, etc.) connecting margins to domes. At various locations ice-sheet margins were verified by dated moraines for terrestrial margins and Egga-type moraines for marine margins. Ice-sheet elevations and thicknesses were contoured from profiles reconstructed for 40 Antarctic flow lines and 137 Northern Hemisphere flow lines for a maximum ice-sheet extent, and 86 Northern Hemisphere flow lines for a minimum ice-sheet extent. |
format |
Article in Journal/Newspaper |
author |
Denton, G. H. Hughes, T. J. Fastook, J. L. Schilling, D. H. Lingle, C. S. |
author_facet |
Denton, G. H. Hughes, T. J. Fastook, J. L. Schilling, D. H. Lingle, C. S. |
author_sort |
Denton, G. H. |
title |
Reconstruction and Disintegration of Ice Sheets for the Climap 18000 And 125000 Years b.p. Experiments: Results |
title_short |
Reconstruction and Disintegration of Ice Sheets for the Climap 18000 And 125000 Years b.p. Experiments: Results |
title_full |
Reconstruction and Disintegration of Ice Sheets for the Climap 18000 And 125000 Years b.p. Experiments: Results |
title_fullStr |
Reconstruction and Disintegration of Ice Sheets for the Climap 18000 And 125000 Years b.p. Experiments: Results |
title_full_unstemmed |
Reconstruction and Disintegration of Ice Sheets for the Climap 18000 And 125000 Years b.p. Experiments: Results |
title_sort |
reconstruction and disintegration of ice sheets for the climap 18000 and 125000 years b.p. experiments: results |
publisher |
Cambridge University Press (CUP) |
publishDate |
1979 |
url |
http://dx.doi.org/10.1017/s0022143000015069 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0022143000015069 |
long_lat |
ENVELOPE(14.802,14.802,68.830,68.830) |
geographic |
Antarctic Egga |
geographic_facet |
Antarctic Egga |
genre |
Antarc* Antarctic Ice Sheet Journal of Glaciology |
genre_facet |
Antarc* Antarctic Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology volume 24, issue 90, page 495-496 ISSN 0022-1430 1727-5652 |
op_doi |
https://doi.org/10.1017/s0022143000015069 |
container_title |
Journal of Glaciology |
container_volume |
24 |
container_issue |
90 |
container_start_page |
495 |
op_container_end_page |
496 |
_version_ |
1792502993438900224 |