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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fttriple:oai:gotriple.eu:t2AEGD4NIZCCoKL7CRKug 2023-05-15T16:27:33+02:00 Revisiting the absolute calibration of the Greenland ice-core age-scales Skinner, L. C. 2008-01-01 https://doi.org/10.5194/cp-4-295-2008 https://archimer.ifremer.fr/doc/00238/34894/33134.pdf https://archimer.ifremer.fr/doc/00238/34894/ en eng Copernicus Publications doi:10.5194/cp-4-295-2008 10670/1.4n1vub 10670/1.oqbvwm https://archimer.ifremer.fr/doc/00238/34894/33134.pdf https://archimer.ifremer.fr/doc/00238/34894/ lic_creative-commons other undefined Archimer, archive institutionnelle de l'Ifremer Geographica Helvetica - geography Climate Of The Past (1814-9324) (Copernicus Publications), 2008 , Vol. 4 , N. 4 , P. 295-302 envir geo Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2008 fttriple https://doi.org/10.5194/cp-4-295-2008 2023-01-22T17:52:21Z 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 similar 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 similar to 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. Text Greenland Greenland ice core Greenland ice cores GRIP ice core NGRIP North Atlantic Northeast Atlantic Unknown Greenland Shackleton Climate of the Past 4 4 295 302 |
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English |
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envir geo Skinner, L. C. Revisiting the absolute calibration of the Greenland ice-core age-scales |
topic_facet |
envir geo |
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 similar 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 similar to 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 |
Text |
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://archimer.ifremer.fr/doc/00238/34894/33134.pdf https://archimer.ifremer.fr/doc/00238/34894/ |
geographic |
Greenland Shackleton |
geographic_facet |
Greenland Shackleton |
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_source |
Archimer, archive institutionnelle de l'Ifremer Geographica Helvetica - geography Climate Of The Past (1814-9324) (Copernicus Publications), 2008 , Vol. 4 , N. 4 , P. 295-302 |
op_relation |
doi:10.5194/cp-4-295-2008 10670/1.4n1vub 10670/1.oqbvwm https://archimer.ifremer.fr/doc/00238/34894/33134.pdf https://archimer.ifremer.fr/doc/00238/34894/ |
op_rights |
lic_creative-commons other undefined |
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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1766016955521695744 |