Phase relationships between orbital forcing and the composition of air trapped in Antarctic ice cores
Orbital tuning is central for ice core chronologies beyond annual layer counting, available back to 60 ka (i.e. thousands of years before 1950) for Greenland ice cores. While several complementary orbital tuning tools have recently been developed using δ18Oatm, δO2⁄N2 and air content with different...
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Copernicus Publications
2016
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Online Access: | https://doi.org/10.5194/cp-12-729-2016 http://www.clim-past.net/12/729/2016/cp-12-729-2016.pdf https://doaj.org/article/ab1adfce666b45e9b9d39b0b0efc90bb |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:ab1adfce666b45e9b9d39b0b0efc90bb 2023-05-15T14:00:46+02:00 Phase relationships between orbital forcing and the composition of air trapped in Antarctic ice cores L. Bazin A. Landais E. Capron V. Masson-Delmotte C. Ritz G. Picard J. Jouzel M. Dumont M. Leuenberger F. Prié 2016-03-01 https://doi.org/10.5194/cp-12-729-2016 http://www.clim-past.net/12/729/2016/cp-12-729-2016.pdf https://doaj.org/article/ab1adfce666b45e9b9d39b0b0efc90bb en eng Copernicus Publications 1814-9324 1814-9332 doi:10.5194/cp-12-729-2016 http://www.clim-past.net/12/729/2016/cp-12-729-2016.pdf https://doaj.org/article/ab1adfce666b45e9b9d39b0b0efc90bb undefined Climate of the Past, Vol 12, Iss 3, Pp 729-748 (2016) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2016 fttriple https://doi.org/10.5194/cp-12-729-2016 2023-01-22T17:49:42Z Orbital tuning is central for ice core chronologies beyond annual layer counting, available back to 60 ka (i.e. thousands of years before 1950) for Greenland ice cores. While several complementary orbital tuning tools have recently been developed using δ18Oatm, δO2⁄N2 and air content with different orbital targets, quantifying their uncertainties remains a challenge. Indeed, the exact processes linking variations of these parameters, measured in the air trapped in ice, to their orbital targets are not yet fully understood. Here, we provide new series of δO2∕N2 and δ18Oatm data encompassing Marine Isotopic Stage (MIS) 5 (between 100 and 160 ka) and the oldest part (340–800 ka) of the East Antarctic EPICA Dome C (EDC) ice core. For the first time, the measurements over MIS 5 allow an inter-comparison of δO2∕N2 and δ18Oatm records from three East Antarctic ice core sites (EDC, Vostok and Dome F). This comparison highlights some site-specific δO2∕N2 variations. Such an observation, the evidence of a 100 ka periodicity in the δO2∕N2 signal and the difficulty to identify extrema and mid-slopes in δO2∕N2 increase the uncertainty associated with the use of δO2∕N2 as an orbital tuning tool, now calculated to be 3–4 ka. When combining records of δ18Oatm and δO2∕N2 from Vostok and EDC, we find a loss of orbital signature for these two parameters during periods of minimum eccentricity (∼ 400 ka, ∼ 720–800 ka). Our data set reveals a time-varying offset between δO2∕N2 and δ18Oatm records over the last 800 ka that we interpret as variations in the lagged response of δ18Oatm to precession. The largest offsets are identified during Terminations II, MIS 8 and MIS 16, corresponding to periods of destabilization of the Northern polar ice sheets. We therefore suggest that the occurrence of Heinrich–like events influences the response of δ18Oatm to precession. Article in Journal/Newspaper Antarc* Antarctic EPICA Greenland Greenland ice cores ice core Unknown Antarctic Dome F ENVELOPE(39.700,39.700,-77.317,-77.317) Greenland Climate of the Past 12 3 729 748 |
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Open Polar |
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fttriple |
language |
English |
topic |
geo envir |
spellingShingle |
geo envir L. Bazin A. Landais E. Capron V. Masson-Delmotte C. Ritz G. Picard J. Jouzel M. Dumont M. Leuenberger F. Prié Phase relationships between orbital forcing and the composition of air trapped in Antarctic ice cores |
topic_facet |
geo envir |
description |
Orbital tuning is central for ice core chronologies beyond annual layer counting, available back to 60 ka (i.e. thousands of years before 1950) for Greenland ice cores. While several complementary orbital tuning tools have recently been developed using δ18Oatm, δO2⁄N2 and air content with different orbital targets, quantifying their uncertainties remains a challenge. Indeed, the exact processes linking variations of these parameters, measured in the air trapped in ice, to their orbital targets are not yet fully understood. Here, we provide new series of δO2∕N2 and δ18Oatm data encompassing Marine Isotopic Stage (MIS) 5 (between 100 and 160 ka) and the oldest part (340–800 ka) of the East Antarctic EPICA Dome C (EDC) ice core. For the first time, the measurements over MIS 5 allow an inter-comparison of δO2∕N2 and δ18Oatm records from three East Antarctic ice core sites (EDC, Vostok and Dome F). This comparison highlights some site-specific δO2∕N2 variations. Such an observation, the evidence of a 100 ka periodicity in the δO2∕N2 signal and the difficulty to identify extrema and mid-slopes in δO2∕N2 increase the uncertainty associated with the use of δO2∕N2 as an orbital tuning tool, now calculated to be 3–4 ka. When combining records of δ18Oatm and δO2∕N2 from Vostok and EDC, we find a loss of orbital signature for these two parameters during periods of minimum eccentricity (∼ 400 ka, ∼ 720–800 ka). Our data set reveals a time-varying offset between δO2∕N2 and δ18Oatm records over the last 800 ka that we interpret as variations in the lagged response of δ18Oatm to precession. The largest offsets are identified during Terminations II, MIS 8 and MIS 16, corresponding to periods of destabilization of the Northern polar ice sheets. We therefore suggest that the occurrence of Heinrich–like events influences the response of δ18Oatm to precession. |
format |
Article in Journal/Newspaper |
author |
L. Bazin A. Landais E. Capron V. Masson-Delmotte C. Ritz G. Picard J. Jouzel M. Dumont M. Leuenberger F. Prié |
author_facet |
L. Bazin A. Landais E. Capron V. Masson-Delmotte C. Ritz G. Picard J. Jouzel M. Dumont M. Leuenberger F. Prié |
author_sort |
L. Bazin |
title |
Phase relationships between orbital forcing and the composition of air trapped in Antarctic ice cores |
title_short |
Phase relationships between orbital forcing and the composition of air trapped in Antarctic ice cores |
title_full |
Phase relationships between orbital forcing and the composition of air trapped in Antarctic ice cores |
title_fullStr |
Phase relationships between orbital forcing and the composition of air trapped in Antarctic ice cores |
title_full_unstemmed |
Phase relationships between orbital forcing and the composition of air trapped in Antarctic ice cores |
title_sort |
phase relationships between orbital forcing and the composition of air trapped in antarctic ice cores |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/cp-12-729-2016 http://www.clim-past.net/12/729/2016/cp-12-729-2016.pdf https://doaj.org/article/ab1adfce666b45e9b9d39b0b0efc90bb |
long_lat |
ENVELOPE(39.700,39.700,-77.317,-77.317) |
geographic |
Antarctic Dome F Greenland |
geographic_facet |
Antarctic Dome F Greenland |
genre |
Antarc* Antarctic EPICA Greenland Greenland ice cores ice core |
genre_facet |
Antarc* Antarctic EPICA Greenland Greenland ice cores ice core |
op_source |
Climate of the Past, Vol 12, Iss 3, Pp 729-748 (2016) |
op_relation |
1814-9324 1814-9332 doi:10.5194/cp-12-729-2016 http://www.clim-past.net/12/729/2016/cp-12-729-2016.pdf https://doaj.org/article/ab1adfce666b45e9b9d39b0b0efc90bb |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-12-729-2016 |
container_title |
Climate of the Past |
container_volume |
12 |
container_issue |
3 |
container_start_page |
729 |
op_container_end_page |
748 |
_version_ |
1766270105493176320 |