Direct north-south synchronization of abrupt climate change record in ice cores using Beryllium 10
Gas is trapped in polar ice sheets at 50–120m below the surface and is therefore younger than the surrounding ice. Firn densification models are used to evaluate this ice age-gas age difference (1age) in the past. However, such models need to be validated by data, in particular for periods colder th...
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ftccsdartic:oai:HAL:in2p3-00182754v1 2023-05-15T14:03:40+02:00 Direct north-south synchronization of abrupt climate change record in ice cores using Beryllium 10 Raisbeck, G. Yiou, F. Jouzel, Jean Stocker, T.F. Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM) Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) 2007 http://hal.in2p3.fr/in2p3-00182754 http://hal.in2p3.fr/in2p3-00182754/document http://hal.in2p3.fr/in2p3-00182754/file/cp-3-541-2007.pdf en eng HAL CCSD European Geosciences Union (EGU) in2p3-00182754 http://hal.in2p3.fr/in2p3-00182754 http://hal.in2p3.fr/in2p3-00182754/document http://hal.in2p3.fr/in2p3-00182754/file/cp-3-541-2007.pdf info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past http://hal.in2p3.fr/in2p3-00182754 Climate of the Past, European Geosciences Union (EGU), 2007, 3, pp.541-547 [SDE.MCG.CPE]Environmental Sciences/Global Changes/domain_sde.mcg.cpe [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2007 ftccsdartic 2020-12-26T16:55:41Z Gas is trapped in polar ice sheets at 50–120m below the surface and is therefore younger than the surrounding ice. Firn densification models are used to evaluate this ice age-gas age difference (1age) in the past. However, such models need to be validated by data, in particular for periods colder than present day on the East Antarctic plateau. Here we bring new constraints to test a firn densification model applied to the EPICA Dome C (EDC) site for the last 50 kyr, by linking the EDC ice core to the EPICA Dronning Maud Land (EDML) ice core, both in the ice phase (using volcanic horizons) and in the gas phase (using rapid methane variations). We also use the structured 10Be peak, occurring 41 kyr before present (BP) and due to the low geomagnetic field associated with the Laschamp event, to experimentally estimate the 1age during this event. Our results seem to reveal an overestimate of the 1age by the firn densification model during the last glacial period at EDC. Tests with different accumulation rates and temperature scenarios do not entirely resolve this discrepancy. Although the exact reasons for the 1age overestimate at the two EPICA sites remain unknown at this stage, we conclude that current densification model simulations have deficits under glacial climatic conditions. Whatever the cause of the 1age overestimate, our finding suggests that the phase relationship between CO2 and EDC temperature previously inferred for the start of the last deglaciation (lag of CO2 by 800±600 yr) seems to be overestimated. Article in Journal/Newspaper Antarc* Antarctic Dronning Maud Land EPICA ice core Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Dronning Maud Land |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDE.MCG.CPE]Environmental Sciences/Global Changes/domain_sde.mcg.cpe [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
[SDE.MCG.CPE]Environmental Sciences/Global Changes/domain_sde.mcg.cpe [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Raisbeck, G. Yiou, F. Jouzel, Jean Stocker, T.F. Direct north-south synchronization of abrupt climate change record in ice cores using Beryllium 10 |
topic_facet |
[SDE.MCG.CPE]Environmental Sciences/Global Changes/domain_sde.mcg.cpe [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
Gas is trapped in polar ice sheets at 50–120m below the surface and is therefore younger than the surrounding ice. Firn densification models are used to evaluate this ice age-gas age difference (1age) in the past. However, such models need to be validated by data, in particular for periods colder than present day on the East Antarctic plateau. Here we bring new constraints to test a firn densification model applied to the EPICA Dome C (EDC) site for the last 50 kyr, by linking the EDC ice core to the EPICA Dronning Maud Land (EDML) ice core, both in the ice phase (using volcanic horizons) and in the gas phase (using rapid methane variations). We also use the structured 10Be peak, occurring 41 kyr before present (BP) and due to the low geomagnetic field associated with the Laschamp event, to experimentally estimate the 1age during this event. Our results seem to reveal an overestimate of the 1age by the firn densification model during the last glacial period at EDC. Tests with different accumulation rates and temperature scenarios do not entirely resolve this discrepancy. Although the exact reasons for the 1age overestimate at the two EPICA sites remain unknown at this stage, we conclude that current densification model simulations have deficits under glacial climatic conditions. Whatever the cause of the 1age overestimate, our finding suggests that the phase relationship between CO2 and EDC temperature previously inferred for the start of the last deglaciation (lag of CO2 by 800±600 yr) seems to be overestimated. |
author2 |
Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM) Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Raisbeck, G. Yiou, F. Jouzel, Jean Stocker, T.F. |
author_facet |
Raisbeck, G. Yiou, F. Jouzel, Jean Stocker, T.F. |
author_sort |
Raisbeck, G. |
title |
Direct north-south synchronization of abrupt climate change record in ice cores using Beryllium 10 |
title_short |
Direct north-south synchronization of abrupt climate change record in ice cores using Beryllium 10 |
title_full |
Direct north-south synchronization of abrupt climate change record in ice cores using Beryllium 10 |
title_fullStr |
Direct north-south synchronization of abrupt climate change record in ice cores using Beryllium 10 |
title_full_unstemmed |
Direct north-south synchronization of abrupt climate change record in ice cores using Beryllium 10 |
title_sort |
direct north-south synchronization of abrupt climate change record in ice cores using beryllium 10 |
publisher |
HAL CCSD |
publishDate |
2007 |
url |
http://hal.in2p3.fr/in2p3-00182754 http://hal.in2p3.fr/in2p3-00182754/document http://hal.in2p3.fr/in2p3-00182754/file/cp-3-541-2007.pdf |
geographic |
Antarctic Dronning Maud Land |
geographic_facet |
Antarctic Dronning Maud Land |
genre |
Antarc* Antarctic Dronning Maud Land EPICA ice core |
genre_facet |
Antarc* Antarctic Dronning Maud Land EPICA ice core |
op_source |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past http://hal.in2p3.fr/in2p3-00182754 Climate of the Past, European Geosciences Union (EGU), 2007, 3, pp.541-547 |
op_relation |
in2p3-00182754 http://hal.in2p3.fr/in2p3-00182754 http://hal.in2p3.fr/in2p3-00182754/document http://hal.in2p3.fr/in2p3-00182754/file/cp-3-541-2007.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766274446879883264 |