Implementation of counted layers for coherent ice core chronology
A recent coherent chronology has been built for four Antarctic ice cores and the NorthGRIP (NGRIP) Greenland ice core (Antarctic Ice Core Chronology 2012, AICC2012) using a Bayesian approach for ice core dating (Datice). When building the AICC2012 chronology, and in order to prevent any confusion wi...
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fttriple:oai:gotriple.eu:oai:doaj.org/article:c6d2b6a821f6415ab3844d99b403b38c 2023-05-15T13:55:56+02:00 Implementation of counted layers for coherent ice core chronology B. Lemieux-Dudon L. Bazin A. Landais H. Toyé Mahamadou Kele M. Guillevic P. Kindler F. Parrenin P. Martinerie 2015-06-01 https://doi.org/10.5194/cp-11-959-2015 http://www.clim-past.net/11/959/2015/cp-11-959-2015.pdf https://doaj.org/article/c6d2b6a821f6415ab3844d99b403b38c en eng Copernicus Publications 1814-9324 1814-9332 doi:10.5194/cp-11-959-2015 http://www.clim-past.net/11/959/2015/cp-11-959-2015.pdf https://doaj.org/article/c6d2b6a821f6415ab3844d99b403b38c undefined Climate of the Past, Vol 11, Iss 6, Pp 959-978 (2015) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2015 fttriple https://doi.org/10.5194/cp-11-959-2015 2023-01-22T19:12:23Z A recent coherent chronology has been built for four Antarctic ice cores and the NorthGRIP (NGRIP) Greenland ice core (Antarctic Ice Core Chronology 2012, AICC2012) using a Bayesian approach for ice core dating (Datice). When building the AICC2012 chronology, and in order to prevent any confusion with official ice core chronology, the AICC2012 chronology for NGRIP was forced to fit exactly the GICC05 chronology based on layer counting. However, such a strong tuning did not satisfy the hypothesis of independence of background parameters and observations for the NGRIP core, as required by Datice. We present here the implementation in Datice of a new type of markers that is better suited for constraints deduced from layer counting: the duration constraints. Estimating the global error on chronology due to such markers is not straightforward and implies some assumption on the correlation between individual counting errors for each interval of duration. We validate this new methodological implementation by conducting twin experiments and a posteriori diagnostics on the NGRIP ice core. Several sensitivity tests on marker sampling and correlation between counting errors were performed to provide some guidelines when using such a method for future dating experiments. Finally, using these markers for NGRIP in a five-core dating exercise with Datice leads to new chronologies that do not differ by more than 410 years from AICC2012 for Antarctic ice cores and 150 years from GICC05 for NGRIP over the last 60 000 years. Article in Journal/Newspaper Antarc* Antarctic Greenland Greenland ice core ice core NGRIP Unknown Antarctic Greenland Climate of the Past 11 6 959 978 |
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geo envir B. Lemieux-Dudon L. Bazin A. Landais H. Toyé Mahamadou Kele M. Guillevic P. Kindler F. Parrenin P. Martinerie Implementation of counted layers for coherent ice core chronology |
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geo envir |
description |
A recent coherent chronology has been built for four Antarctic ice cores and the NorthGRIP (NGRIP) Greenland ice core (Antarctic Ice Core Chronology 2012, AICC2012) using a Bayesian approach for ice core dating (Datice). When building the AICC2012 chronology, and in order to prevent any confusion with official ice core chronology, the AICC2012 chronology for NGRIP was forced to fit exactly the GICC05 chronology based on layer counting. However, such a strong tuning did not satisfy the hypothesis of independence of background parameters and observations for the NGRIP core, as required by Datice. We present here the implementation in Datice of a new type of markers that is better suited for constraints deduced from layer counting: the duration constraints. Estimating the global error on chronology due to such markers is not straightforward and implies some assumption on the correlation between individual counting errors for each interval of duration. We validate this new methodological implementation by conducting twin experiments and a posteriori diagnostics on the NGRIP ice core. Several sensitivity tests on marker sampling and correlation between counting errors were performed to provide some guidelines when using such a method for future dating experiments. Finally, using these markers for NGRIP in a five-core dating exercise with Datice leads to new chronologies that do not differ by more than 410 years from AICC2012 for Antarctic ice cores and 150 years from GICC05 for NGRIP over the last 60 000 years. |
format |
Article in Journal/Newspaper |
author |
B. Lemieux-Dudon L. Bazin A. Landais H. Toyé Mahamadou Kele M. Guillevic P. Kindler F. Parrenin P. Martinerie |
author_facet |
B. Lemieux-Dudon L. Bazin A. Landais H. Toyé Mahamadou Kele M. Guillevic P. Kindler F. Parrenin P. Martinerie |
author_sort |
B. Lemieux-Dudon |
title |
Implementation of counted layers for coherent ice core chronology |
title_short |
Implementation of counted layers for coherent ice core chronology |
title_full |
Implementation of counted layers for coherent ice core chronology |
title_fullStr |
Implementation of counted layers for coherent ice core chronology |
title_full_unstemmed |
Implementation of counted layers for coherent ice core chronology |
title_sort |
implementation of counted layers for coherent ice core chronology |
publisher |
Copernicus Publications |
publishDate |
2015 |
url |
https://doi.org/10.5194/cp-11-959-2015 http://www.clim-past.net/11/959/2015/cp-11-959-2015.pdf https://doaj.org/article/c6d2b6a821f6415ab3844d99b403b38c |
geographic |
Antarctic Greenland |
geographic_facet |
Antarctic Greenland |
genre |
Antarc* Antarctic Greenland Greenland ice core ice core NGRIP |
genre_facet |
Antarc* Antarctic Greenland Greenland ice core ice core NGRIP |
op_source |
Climate of the Past, Vol 11, Iss 6, Pp 959-978 (2015) |
op_relation |
1814-9324 1814-9332 doi:10.5194/cp-11-959-2015 http://www.clim-past.net/11/959/2015/cp-11-959-2015.pdf https://doaj.org/article/c6d2b6a821f6415ab3844d99b403b38c |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-11-959-2015 |
container_title |
Climate of the Past |
container_volume |
11 |
container_issue |
6 |
container_start_page |
959 |
op_container_end_page |
978 |
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1766262917457510400 |