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 δ 18 O atm , δ O 2 ⁄N 2 and air content with di...
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ftdoajarticles:oai:doaj.org/article:ab1adfce666b45e9b9d39b0b0efc90bb 2023-05-15T13:47:34+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 2016-03-01T00:00:00Z https://doi.org/10.5194/cp-12-729-2016 https://doaj.org/article/ab1adfce666b45e9b9d39b0b0efc90bb EN eng Copernicus Publications http://www.clim-past.net/12/729/2016/cp-12-729-2016.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-12-729-2016 https://doaj.org/article/ab1adfce666b45e9b9d39b0b0efc90bb Climate of the Past, Vol 12, Iss 3, Pp 729-748 (2016) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2016 ftdoajarticles https://doi.org/10.5194/cp-12-729-2016 2022-12-31T04:32:04Z 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 δ 18 O atm , δ O 2 ⁄N 2 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 δ O 2 ∕N 2 and δ 18 O atm 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 δ O 2 ∕N 2 and δ 18 O atm records from three East Antarctic ice core sites (EDC, Vostok and Dome F). This comparison highlights some site-specific δ O 2 ∕N 2 variations. Such an observation, the evidence of a 100 ka periodicity in the δ O 2 ∕N 2 signal and the difficulty to identify extrema and mid-slopes in δ O 2 ∕N 2 increase the uncertainty associated with the use of δ O 2 ∕N 2 as an orbital tuning tool, now calculated to be 3–4 ka. When combining records of δ 18 O atm and δ O 2 ∕N 2 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 δ O 2 ∕N 2 and δ 18 O atm records over the last 800 ka that we interpret as variations in the lagged response of δ 18 O atm 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 δ 18 O atm to precession. Article in Journal/Newspaper Antarc* Antarctic EPICA Greenland Greenland ice cores ice core Directory of Open Access Journals: DOAJ Articles Antarctic Greenland Dome F ENVELOPE(39.700,39.700,-77.317,-77.317) Climate of the Past 12 3 729 748 |
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 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 |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
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 δ 18 O atm , δ O 2 ⁄N 2 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 δ O 2 ∕N 2 and δ 18 O atm 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 δ O 2 ∕N 2 and δ 18 O atm records from three East Antarctic ice core sites (EDC, Vostok and Dome F). This comparison highlights some site-specific δ O 2 ∕N 2 variations. Such an observation, the evidence of a 100 ka periodicity in the δ O 2 ∕N 2 signal and the difficulty to identify extrema and mid-slopes in δ O 2 ∕N 2 increase the uncertainty associated with the use of δ O 2 ∕N 2 as an orbital tuning tool, now calculated to be 3–4 ka. When combining records of δ 18 O atm and δ O 2 ∕N 2 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 δ O 2 ∕N 2 and δ 18 O atm records over the last 800 ka that we interpret as variations in the lagged response of δ 18 O atm 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 δ 18 O atm 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 https://doaj.org/article/ab1adfce666b45e9b9d39b0b0efc90bb |
long_lat |
ENVELOPE(39.700,39.700,-77.317,-77.317) |
geographic |
Antarctic Greenland Dome F |
geographic_facet |
Antarctic Greenland Dome F |
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 |
http://www.clim-past.net/12/729/2016/cp-12-729-2016.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 1814-9324 1814-9332 doi:10.5194/cp-12-729-2016 https://doaj.org/article/ab1adfce666b45e9b9d39b0b0efc90bb |
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_ |
1766247310850785280 |