Anomalous flow below 2700 m in the EPICA Dome C ice core detected using δ18O of atmospheric oxygen measurements
While there are no indications of mixing back to 800 000 years in the EPICA Dome C ice core record, comparison with marine sediment records shows significant differences in the timing and duration of events prior to stage 11 (~430 ka, thousands of years before 1950). A relationship between the isoto...
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00032331 2023-05-15T16:06:16+02:00 Anomalous flow below 2700 m in the EPICA Dome C ice core detected using δ18O of atmospheric oxygen measurements Dreyfus, G. B. Parrenin, F. Lemieux-Dudon, B. Durand, G. Masson-Delmotte, V. Jouzel, J. Barnola, J.-M. Panno, L. Spahni, R. Tisserand, A. Siegenthaler, U. Leuenberger, M. 2007-06 electronic https://doi.org/10.5194/cp-3-341-2007 https://noa.gwlb.de/receive/cop_mods_00032331 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00032285/cp-3-341-2007.pdf https://cp.copernicus.org/articles/3/341/2007/cp-3-341-2007.pdf eng eng Copernicus Publications Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-3-341-2007 https://noa.gwlb.de/receive/cop_mods_00032331 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00032285/cp-3-341-2007.pdf https://cp.copernicus.org/articles/3/341/2007/cp-3-341-2007.pdf https://open-access.net/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2007 ftnonlinearchiv https://doi.org/10.5194/cp-3-341-2007 2022-02-08T22:46:17Z While there are no indications of mixing back to 800 000 years in the EPICA Dome C ice core record, comparison with marine sediment records shows significant differences in the timing and duration of events prior to stage 11 (~430 ka, thousands of years before 1950). A relationship between the isotopic composition of atmospheric oxygen (δ18O of O2, noted δ18Oatm) and daily northern hemisphere summer insolation has been observed for the youngest four climate cycles. Here we use this relationship with new δ18O of O2 measurements to show that anomalous flow in the bottom 500 m of the core distorts the duration of events by up to a factor of 2. By tuning δ18Oatm to orbital precession we derive a corrected thinning function and present a revised age scale for the interval corresponding to Marine Isotope Stages 11–20 in the EPICA Dome C ice core. Uncertainty in the phasing of δ18Oatm with respect to insolation variations in the precession band limits the accuracy of this new agescale to ±6 kyr (thousand of years). The previously reported ~30 kyr duration of interglacial stage 11 is unchanged. In contrast, the duration of stage 15.1 is reduced by a factor of 2, from 31 to 16 kyr. Article in Journal/Newspaper EPICA ice core Niedersächsisches Online-Archiv NOA Climate of the Past 3 2 341 353 |
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article Verlagsveröffentlichung Dreyfus, G. B. Parrenin, F. Lemieux-Dudon, B. Durand, G. Masson-Delmotte, V. Jouzel, J. Barnola, J.-M. Panno, L. Spahni, R. Tisserand, A. Siegenthaler, U. Leuenberger, M. Anomalous flow below 2700 m in the EPICA Dome C ice core detected using δ18O of atmospheric oxygen measurements |
topic_facet |
article Verlagsveröffentlichung |
description |
While there are no indications of mixing back to 800 000 years in the EPICA Dome C ice core record, comparison with marine sediment records shows significant differences in the timing and duration of events prior to stage 11 (~430 ka, thousands of years before 1950). A relationship between the isotopic composition of atmospheric oxygen (δ18O of O2, noted δ18Oatm) and daily northern hemisphere summer insolation has been observed for the youngest four climate cycles. Here we use this relationship with new δ18O of O2 measurements to show that anomalous flow in the bottom 500 m of the core distorts the duration of events by up to a factor of 2. By tuning δ18Oatm to orbital precession we derive a corrected thinning function and present a revised age scale for the interval corresponding to Marine Isotope Stages 11–20 in the EPICA Dome C ice core. Uncertainty in the phasing of δ18Oatm with respect to insolation variations in the precession band limits the accuracy of this new agescale to ±6 kyr (thousand of years). The previously reported ~30 kyr duration of interglacial stage 11 is unchanged. In contrast, the duration of stage 15.1 is reduced by a factor of 2, from 31 to 16 kyr. |
format |
Article in Journal/Newspaper |
author |
Dreyfus, G. B. Parrenin, F. Lemieux-Dudon, B. Durand, G. Masson-Delmotte, V. Jouzel, J. Barnola, J.-M. Panno, L. Spahni, R. Tisserand, A. Siegenthaler, U. Leuenberger, M. |
author_facet |
Dreyfus, G. B. Parrenin, F. Lemieux-Dudon, B. Durand, G. Masson-Delmotte, V. Jouzel, J. Barnola, J.-M. Panno, L. Spahni, R. Tisserand, A. Siegenthaler, U. Leuenberger, M. |
author_sort |
Dreyfus, G. B. |
title |
Anomalous flow below 2700 m in the EPICA Dome C ice core detected using δ18O of atmospheric oxygen measurements |
title_short |
Anomalous flow below 2700 m in the EPICA Dome C ice core detected using δ18O of atmospheric oxygen measurements |
title_full |
Anomalous flow below 2700 m in the EPICA Dome C ice core detected using δ18O of atmospheric oxygen measurements |
title_fullStr |
Anomalous flow below 2700 m in the EPICA Dome C ice core detected using δ18O of atmospheric oxygen measurements |
title_full_unstemmed |
Anomalous flow below 2700 m in the EPICA Dome C ice core detected using δ18O of atmospheric oxygen measurements |
title_sort |
anomalous flow below 2700 m in the epica dome c ice core detected using δ18o of atmospheric oxygen measurements |
publisher |
Copernicus Publications |
publishDate |
2007 |
url |
https://doi.org/10.5194/cp-3-341-2007 https://noa.gwlb.de/receive/cop_mods_00032331 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00032285/cp-3-341-2007.pdf https://cp.copernicus.org/articles/3/341/2007/cp-3-341-2007.pdf |
genre |
EPICA ice core |
genre_facet |
EPICA ice core |
op_relation |
Climate of the Past -- http://www.copernicus.org/EGU/cp/cp/published_papers.html -- http://www.bibliothek.uni-regensburg.de/ezeit/?2217985 -- 1814-9332 https://doi.org/10.5194/cp-3-341-2007 https://noa.gwlb.de/receive/cop_mods_00032331 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00032285/cp-3-341-2007.pdf https://cp.copernicus.org/articles/3/341/2007/cp-3-341-2007.pdf |
op_rights |
https://open-access.net/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-3-341-2007 |
container_title |
Climate of the Past |
container_volume |
3 |
container_issue |
2 |
container_start_page |
341 |
op_container_end_page |
353 |
_version_ |
1766402168095506432 |