Revisiting the absolute calibration of the Greenland ice-core age-scales*
Recently, an absolute "calibration" was proposed for the GRIP and GISP2 Greenland ice-core time scales (Shackleton et al., 2004). This calibration attempted to reconcile the stratigraphic integration of ice-core, marine and speleothem archives with the absolute age constraints that marine...
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Copernicus Publications
2008
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00030887 2023-05-15T16:27:33+02:00 Revisiting the absolute calibration of the Greenland ice-core age-scales* Skinner, L. C. 2008-11 electronic https://doi.org/10.5194/cp-4-295-2008 https://noa.gwlb.de/receive/cop_mods_00030887 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00030841/cp-4-295-2008.pdf https://cp.copernicus.org/articles/4/295/2008/cp-4-295-2008.pdf eng eng Copernicus Publications Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-4-295-2008 https://noa.gwlb.de/receive/cop_mods_00030887 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00030841/cp-4-295-2008.pdf https://cp.copernicus.org/articles/4/295/2008/cp-4-295-2008.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2008 ftnonlinearchiv https://doi.org/10.5194/cp-4-295-2008 2022-02-08T22:47:01Z Recently, an absolute "calibration" was proposed for the GRIP and GISP2 Greenland ice-core time scales (Shackleton et al., 2004). This calibration attempted to reconcile the stratigraphic integration of ice-core, marine and speleothem archives with the absolute age constraints that marine and speleothem records incorporate. Here we revisit this calibration in light of the new layer-counted chronology of the NGRIP ice-core (GICC05). The GICC05 age-scale differs from the proposed absolute calibration by up to 1200 years late in the last glaciation, with implications both for radiocarbon cycling and the inferred timing of North Atlantic climate events relative to radiometrically dated archives (e.g. relative sea-level). By aligning the stratigraphy of Iberian Margin marine cores with that of the Greenland ice-cores, it can be shown that either: 1) the radiocarbon content of mid-latitude Atlantic surface-waters was extremely depleted (resulting in average surface reservoir ages up to 1700 years prior to ~22 ka BP); or 2) the GICC05 age-scale includes too few years (is up to 1200 years too young). It is shown here that both of these possibilities are probably correct to some degree. Based on the assumed accuracy of coral and speleothem U-Th ages, Northeast Atlantic surface reservoir ages should be revised upward by ~350 years, while the NGRIP age-scale appears to be "missing" time. These findings illustrate the utility of integrated stratigraphy as a test for our chronologies, which are rarely truly "absolute". This is an important point, since probably the worst error that we can make is to entrench and generalise a precise stratigraphical relationship on the basis of erroneous absolute age assignations. Article in Journal/Newspaper Greenland Greenland ice core Greenland ice cores GRIP ice core NGRIP North Atlantic Northeast Atlantic Niedersächsisches Online-Archiv NOA Shackleton Greenland Climate of the Past 4 4 295 302 |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Skinner, L. C. Revisiting the absolute calibration of the Greenland ice-core age-scales* |
topic_facet |
article Verlagsveröffentlichung |
description |
Recently, an absolute "calibration" was proposed for the GRIP and GISP2 Greenland ice-core time scales (Shackleton et al., 2004). This calibration attempted to reconcile the stratigraphic integration of ice-core, marine and speleothem archives with the absolute age constraints that marine and speleothem records incorporate. Here we revisit this calibration in light of the new layer-counted chronology of the NGRIP ice-core (GICC05). The GICC05 age-scale differs from the proposed absolute calibration by up to 1200 years late in the last glaciation, with implications both for radiocarbon cycling and the inferred timing of North Atlantic climate events relative to radiometrically dated archives (e.g. relative sea-level). By aligning the stratigraphy of Iberian Margin marine cores with that of the Greenland ice-cores, it can be shown that either: 1) the radiocarbon content of mid-latitude Atlantic surface-waters was extremely depleted (resulting in average surface reservoir ages up to 1700 years prior to ~22 ka BP); or 2) the GICC05 age-scale includes too few years (is up to 1200 years too young). It is shown here that both of these possibilities are probably correct to some degree. Based on the assumed accuracy of coral and speleothem U-Th ages, Northeast Atlantic surface reservoir ages should be revised upward by ~350 years, while the NGRIP age-scale appears to be "missing" time. These findings illustrate the utility of integrated stratigraphy as a test for our chronologies, which are rarely truly "absolute". This is an important point, since probably the worst error that we can make is to entrench and generalise a precise stratigraphical relationship on the basis of erroneous absolute age assignations. |
format |
Article in Journal/Newspaper |
author |
Skinner, L. C. |
author_facet |
Skinner, L. C. |
author_sort |
Skinner, L. C. |
title |
Revisiting the absolute calibration of the Greenland ice-core age-scales* |
title_short |
Revisiting the absolute calibration of the Greenland ice-core age-scales* |
title_full |
Revisiting the absolute calibration of the Greenland ice-core age-scales* |
title_fullStr |
Revisiting the absolute calibration of the Greenland ice-core age-scales* |
title_full_unstemmed |
Revisiting the absolute calibration of the Greenland ice-core age-scales* |
title_sort |
revisiting the absolute calibration of the greenland ice-core age-scales* |
publisher |
Copernicus Publications |
publishDate |
2008 |
url |
https://doi.org/10.5194/cp-4-295-2008 https://noa.gwlb.de/receive/cop_mods_00030887 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00030841/cp-4-295-2008.pdf https://cp.copernicus.org/articles/4/295/2008/cp-4-295-2008.pdf |
geographic |
Shackleton Greenland |
geographic_facet |
Shackleton Greenland |
genre |
Greenland Greenland ice core Greenland ice cores GRIP ice core NGRIP North Atlantic Northeast Atlantic |
genre_facet |
Greenland Greenland ice core Greenland ice cores GRIP ice core NGRIP North Atlantic Northeast Atlantic |
op_relation |
Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-4-295-2008 https://noa.gwlb.de/receive/cop_mods_00030887 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00030841/cp-4-295-2008.pdf https://cp.copernicus.org/articles/4/295/2008/cp-4-295-2008.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-4-295-2008 |
container_title |
Climate of the Past |
container_volume |
4 |
container_issue |
4 |
container_start_page |
295 |
op_container_end_page |
302 |
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1766016957325246464 |