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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Published in:Climate of the Past
Main Authors: B. Lemieux-Dudon, L. Bazin, A. Landais, H. Toyé Mahamadou Kele, M. Guillevic, P. Kindler, F. Parrenin, P. Martinerie
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2015
Subjects:
Online Access:https://doi.org/10.5194/cp-11-959-2015
https://doaj.org/article/c6d2b6a821f6415ab3844d99b403b38c
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spelling ftdoajarticles:oai:doaj.org/article:c6d2b6a821f6415ab3844d99b403b38c 2023-05-15T13:32:37+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 2015-06-01T00:00:00Z https://doi.org/10.5194/cp-11-959-2015 https://doaj.org/article/c6d2b6a821f6415ab3844d99b403b38c EN eng Copernicus Publications http://www.clim-past.net/11/959/2015/cp-11-959-2015.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-11-959-2015 https://doaj.org/article/c6d2b6a821f6415ab3844d99b403b38c Climate of the Past, Vol 11, Iss 6, Pp 959-978 (2015) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2015 ftdoajarticles https://doi.org/10.5194/cp-11-959-2015 2022-12-30T21:11:39Z 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 Directory of Open Access Journals: DOAJ Articles Antarctic Greenland Climate of the Past 11 6 959 978
institution Open Polar
collection Directory of Open Access Journals: DOAJ Articles
op_collection_id ftdoajarticles
language English
topic Environmental pollution
TD172-193.5
Environmental protection
TD169-171.8
Environmental sciences
GE1-350
spellingShingle Environmental pollution
TD172-193.5
Environmental protection
TD169-171.8
Environmental sciences
GE1-350
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
topic_facet Environmental pollution
TD172-193.5
Environmental protection
TD169-171.8
Environmental sciences
GE1-350
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
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 http://www.clim-past.net/11/959/2015/cp-11-959-2015.pdf
https://doaj.org/toc/1814-9324
https://doaj.org/toc/1814-9332
1814-9324
1814-9332
doi:10.5194/cp-11-959-2015
https://doaj.org/article/c6d2b6a821f6415ab3844d99b403b38c
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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