10Be flux in Antarctica during the last 800 000 years and interpretation
The polar ice cores, in addition to improving our understanding of the climate, give access to beryllium-10 (10Be) fallout, an isotope of cosmogenic origin created by the interaction of Galactic Cosmic Rays with the upper atmosphere. Its production rate depends on the intensity of the primary cosmic...
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ftceafr:oai:HAL:tel-00954293v1 2024-06-09T07:41:06+00:00 10Be flux in Antarctica during the last 800 000 years and interpretation Flux de 10Be en Antarctique durant les 800 000 dernières années et interprétation Cauquoin, Alexandre Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Université Paris Sud - Paris XI Jean Jouzel 2013-10-07 https://theses.hal.science/tel-00954293 https://theses.hal.science/tel-00954293/document https://theses.hal.science/tel-00954293/file/VA2_ALEXANDRE_CAUQUOIN_07102013.pdf fr fre HAL CCSD NNT: 2013PA112199 tel-00954293 https://theses.hal.science/tel-00954293 https://theses.hal.science/tel-00954293/document https://theses.hal.science/tel-00954293/file/VA2_ALEXANDRE_CAUQUOIN_07102013.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-00954293 Sciences de la Terre. Université Paris Sud - Paris XI, 2013. Français. ⟨NNT : 2013PA112199⟩ Béryllium-10 Antarctica Solar activity Earth magnetic field Climate Ice core Antarctique Activité solaire Champ magnétique terrestre Climat Carotte de glace [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/doctoralThesis Theses 2013 ftceafr 2024-05-16T12:32:17Z The polar ice cores, in addition to improving our understanding of the climate, give access to beryllium-10 (10Be) fallout, an isotope of cosmogenic origin created by the interaction of Galactic Cosmic Rays with the upper atmosphere. Its production rate depends on the intensity of the primary cosmic rays, which are modulated by solar activity and the Earth's magnetic field. 10Be therefore provides information on these two parameters. It has allowed, among others, the improvement of ice cores chronologies thanks to absolute stratigraphic markers linked to remarkable events of the geomagnetic field as the Laschamp excursion or the Brunhes-Matuyama reversal.EPICA Dome C (75° 06' S, 123° 21' E) is a 3270~m ice core drilled in East Antarctica. It offers a complete climate record over the last 800 000 years (kyr BP). In the framework of the PhD, 2200 10Be samples were measured between 2384 m (269 kyr BP) and 2627 m (355 kyr BP) deep. This continuous sequence provides, on the one hand, the opportunity to study the solar activity during the interglacial period of the Marine Isotope Stage (MIS) 9.3, where the resolution reaches ~20 years. Our results contrast with those during the Holocene, with the noted absence of the de Vries cycle (210 years) in our 10Be profile. On the other hand, this sequence allowed us to verify that the classical estimate of snow accumulation obtained by the dating models of ice cores is correct to within 20% during the succession of glacial – interglacial cycles.These measurements were combined with those previously performed under the responsibility of Grant Raisbeck (publication in preparation). This allows to dispose of a continuous and detailed profile (resolution: 20 to 250 years) between 200 and 800 kyr BP on the EPICA Dome C ice core. The observed 10Be flux variations compare well with changes in the intensity of the geomagnetic field recorded in marine sediments. From this observation, it is possible to propose a synchronization of these profiles in order to place them on a common age ... Doctoral or Postdoctoral Thesis Antarc* Antarctica Antarctique* East Antarctica EPICA ice core HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) East Antarctica |
institution |
Open Polar |
collection |
HAL-CEA (Commissariat à l'énergie atomique et aux énergies alternatives) |
op_collection_id |
ftceafr |
language |
French |
topic |
Béryllium-10 Antarctica Solar activity Earth magnetic field Climate Ice core Antarctique Activité solaire Champ magnétique terrestre Climat Carotte de glace [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Béryllium-10 Antarctica Solar activity Earth magnetic field Climate Ice core Antarctique Activité solaire Champ magnétique terrestre Climat Carotte de glace [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Cauquoin, Alexandre 10Be flux in Antarctica during the last 800 000 years and interpretation |
topic_facet |
Béryllium-10 Antarctica Solar activity Earth magnetic field Climate Ice core Antarctique Activité solaire Champ magnétique terrestre Climat Carotte de glace [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
The polar ice cores, in addition to improving our understanding of the climate, give access to beryllium-10 (10Be) fallout, an isotope of cosmogenic origin created by the interaction of Galactic Cosmic Rays with the upper atmosphere. Its production rate depends on the intensity of the primary cosmic rays, which are modulated by solar activity and the Earth's magnetic field. 10Be therefore provides information on these two parameters. It has allowed, among others, the improvement of ice cores chronologies thanks to absolute stratigraphic markers linked to remarkable events of the geomagnetic field as the Laschamp excursion or the Brunhes-Matuyama reversal.EPICA Dome C (75° 06' S, 123° 21' E) is a 3270~m ice core drilled in East Antarctica. It offers a complete climate record over the last 800 000 years (kyr BP). In the framework of the PhD, 2200 10Be samples were measured between 2384 m (269 kyr BP) and 2627 m (355 kyr BP) deep. This continuous sequence provides, on the one hand, the opportunity to study the solar activity during the interglacial period of the Marine Isotope Stage (MIS) 9.3, where the resolution reaches ~20 years. Our results contrast with those during the Holocene, with the noted absence of the de Vries cycle (210 years) in our 10Be profile. On the other hand, this sequence allowed us to verify that the classical estimate of snow accumulation obtained by the dating models of ice cores is correct to within 20% during the succession of glacial – interglacial cycles.These measurements were combined with those previously performed under the responsibility of Grant Raisbeck (publication in preparation). This allows to dispose of a continuous and detailed profile (resolution: 20 to 250 years) between 200 and 800 kyr BP on the EPICA Dome C ice core. The observed 10Be flux variations compare well with changes in the intensity of the geomagnetic field recorded in marine sediments. From this observation, it is possible to propose a synchronization of these profiles in order to place them on a common age ... |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Université Paris Sud - Paris XI Jean Jouzel |
format |
Doctoral or Postdoctoral Thesis |
author |
Cauquoin, Alexandre |
author_facet |
Cauquoin, Alexandre |
author_sort |
Cauquoin, Alexandre |
title |
10Be flux in Antarctica during the last 800 000 years and interpretation |
title_short |
10Be flux in Antarctica during the last 800 000 years and interpretation |
title_full |
10Be flux in Antarctica during the last 800 000 years and interpretation |
title_fullStr |
10Be flux in Antarctica during the last 800 000 years and interpretation |
title_full_unstemmed |
10Be flux in Antarctica during the last 800 000 years and interpretation |
title_sort |
10be flux in antarctica during the last 800 000 years and interpretation |
publisher |
HAL CCSD |
publishDate |
2013 |
url |
https://theses.hal.science/tel-00954293 https://theses.hal.science/tel-00954293/document https://theses.hal.science/tel-00954293/file/VA2_ALEXANDRE_CAUQUOIN_07102013.pdf |
geographic |
East Antarctica |
geographic_facet |
East Antarctica |
genre |
Antarc* Antarctica Antarctique* East Antarctica EPICA ice core |
genre_facet |
Antarc* Antarctica Antarctique* East Antarctica EPICA ice core |
op_source |
https://theses.hal.science/tel-00954293 Sciences de la Terre. Université Paris Sud - Paris XI, 2013. Français. ⟨NNT : 2013PA112199⟩ |
op_relation |
NNT: 2013PA112199 tel-00954293 https://theses.hal.science/tel-00954293 https://theses.hal.science/tel-00954293/document https://theses.hal.science/tel-00954293/file/VA2_ALEXANDRE_CAUQUOIN_07102013.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1801369516415909888 |