Isotopic imprint and history of stratospheric volcanism recorded in Dome C, Antarctica, over the last 2600 years
Polar ice has proved to be a very valuable way to access Earth's volcanism history, and a large number of volcanic reconstructions are based on ice-core analysis. Reconstructions are fed into climate forcing models in order to estimate volcanic cooling effect, resulting from the interactions be...
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Other Authors: | , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | French |
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HAL CCSD
2015
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Online Access: | https://theses.hal.science/tel-01560974 https://theses.hal.science/tel-01560974/document https://theses.hal.science/tel-01560974/file/GAUTIER_2015_archivage.pdf |
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ftunivsavoie:oai:HAL:tel-01560974v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université Savoie Mont Blanc: HAL |
op_collection_id |
ftunivsavoie |
language |
French |
topic |
Volcanism Sulfur Isotope Mass spectrometry Climate Ice Volcanisme Soufre Spectrométrie de masse Climat Glace [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
Volcanism Sulfur Isotope Mass spectrometry Climate Ice Volcanisme Soufre Spectrométrie de masse Climat Glace [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Gautier, Elsa Isotopic imprint and history of stratospheric volcanism recorded in Dome C, Antarctica, over the last 2600 years |
topic_facet |
Volcanism Sulfur Isotope Mass spectrometry Climate Ice Volcanisme Soufre Spectrométrie de masse Climat Glace [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
Polar ice has proved to be a very valuable way to access Earth's volcanism history, and a large number of volcanic reconstructions are based on ice-core analysis. Reconstructions are fed into climate forcing models in order to estimate volcanic cooling effect, resulting from the interactions between volcanic sulfuric acid aerosols and incident solar radiations. In this type of reconstruction, determining the potential impact of an eruption is a key step. It usually relies on the identification of its signal in both polar caps (bipolar signal). This wide spatial distribution indeed reflects a significant residence time in the stratosphere, and thus a sizable impact on climate. However, ice cores offer an interesting alternative to this method: the analysis of volcanic sulfates reveals a mass independent fractionation of sulfur (S-MIF) in the aerosols formed in the stratosphere, allowing us to discriminate between low climatic impact (tropospheric) and high climatic impact eruptions (stratospheric). Studying the unusual isotopic signature of stratospheric aerosols simultaneously allows for constraining photochemical mechanisms responsible for this anomaly (Δ33S≠ 0), which are currently only partially identified. In 2010-2011, 5 100m-cores were drilled at Dome C, Antarctica in order to reconstruct a history of stratospheric volcanic over the past 2500 years, by the isotopic method. Drilling 5 replicate cores, 1 m apart, allowed us to study various aspects of the reconstruction.Firstly, we were able to assess the sulfate deposition variability on a local scale, and therefore the statistical representativeness of a single core in a volcanic reconstruction. Sulfate concentration analysis of the 5 cores reveals that local scale variability, essentially attributed to snow drift and surface roughness at Dome C, can lead to a non-exhaustive record of volcanic events if a single core is used; on average 30% of the volcanic events are missing per core, and the uncertainty on the volcanic flux (up to 60%) is ... |
author2 |
Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Université Grenoble Alpes Joël Savarino |
format |
Doctoral or Postdoctoral Thesis |
author |
Gautier, Elsa |
author_facet |
Gautier, Elsa |
author_sort |
Gautier, Elsa |
title |
Isotopic imprint and history of stratospheric volcanism recorded in Dome C, Antarctica, over the last 2600 years |
title_short |
Isotopic imprint and history of stratospheric volcanism recorded in Dome C, Antarctica, over the last 2600 years |
title_full |
Isotopic imprint and history of stratospheric volcanism recorded in Dome C, Antarctica, over the last 2600 years |
title_fullStr |
Isotopic imprint and history of stratospheric volcanism recorded in Dome C, Antarctica, over the last 2600 years |
title_full_unstemmed |
Isotopic imprint and history of stratospheric volcanism recorded in Dome C, Antarctica, over the last 2600 years |
title_sort |
isotopic imprint and history of stratospheric volcanism recorded in dome c, antarctica, over the last 2600 years |
publisher |
HAL CCSD |
publishDate |
2015 |
url |
https://theses.hal.science/tel-01560974 https://theses.hal.science/tel-01560974/document https://theses.hal.science/tel-01560974/file/GAUTIER_2015_archivage.pdf |
genre |
Antarc* Antarctica Antarctique* ice core |
genre_facet |
Antarc* Antarctica Antarctique* ice core |
op_source |
https://theses.hal.science/tel-01560974 Sciences de la Terre. Université Grenoble Alpes, 2015. Français. ⟨NNT : 2015GREAU028⟩ |
op_relation |
NNT: 2015GREAU028 tel-01560974 https://theses.hal.science/tel-01560974 https://theses.hal.science/tel-01560974/document https://theses.hal.science/tel-01560974/file/GAUTIER_2015_archivage.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1797588733868900352 |
spelling |
ftunivsavoie:oai:HAL:tel-01560974v1 2024-04-28T07:57:27+00:00 Isotopic imprint and history of stratospheric volcanism recorded in Dome C, Antarctica, over the last 2600 years Empreinte isotopique et histoire du volcanisme stratosphérique des 2600 dernières années enregistrées à Dôme C, Antarctique Gautier, Elsa Laboratoire de glaciologie et géophysique de l'environnement (LGGE) Observatoire des Sciences de l'Univers de Grenoble (OSUG) Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Université Grenoble Alpes Joël Savarino 2015-11-06 https://theses.hal.science/tel-01560974 https://theses.hal.science/tel-01560974/document https://theses.hal.science/tel-01560974/file/GAUTIER_2015_archivage.pdf fr fre HAL CCSD NNT: 2015GREAU028 tel-01560974 https://theses.hal.science/tel-01560974 https://theses.hal.science/tel-01560974/document https://theses.hal.science/tel-01560974/file/GAUTIER_2015_archivage.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-01560974 Sciences de la Terre. Université Grenoble Alpes, 2015. Français. ⟨NNT : 2015GREAU028⟩ Volcanism Sulfur Isotope Mass spectrometry Climate Ice Volcanisme Soufre Spectrométrie de masse Climat Glace [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/doctoralThesis Theses 2015 ftunivsavoie 2024-04-11T00:57:53Z Polar ice has proved to be a very valuable way to access Earth's volcanism history, and a large number of volcanic reconstructions are based on ice-core analysis. Reconstructions are fed into climate forcing models in order to estimate volcanic cooling effect, resulting from the interactions between volcanic sulfuric acid aerosols and incident solar radiations. In this type of reconstruction, determining the potential impact of an eruption is a key step. It usually relies on the identification of its signal in both polar caps (bipolar signal). This wide spatial distribution indeed reflects a significant residence time in the stratosphere, and thus a sizable impact on climate. However, ice cores offer an interesting alternative to this method: the analysis of volcanic sulfates reveals a mass independent fractionation of sulfur (S-MIF) in the aerosols formed in the stratosphere, allowing us to discriminate between low climatic impact (tropospheric) and high climatic impact eruptions (stratospheric). Studying the unusual isotopic signature of stratospheric aerosols simultaneously allows for constraining photochemical mechanisms responsible for this anomaly (Δ33S≠ 0), which are currently only partially identified. In 2010-2011, 5 100m-cores were drilled at Dome C, Antarctica in order to reconstruct a history of stratospheric volcanic over the past 2500 years, by the isotopic method. Drilling 5 replicate cores, 1 m apart, allowed us to study various aspects of the reconstruction.Firstly, we were able to assess the sulfate deposition variability on a local scale, and therefore the statistical representativeness of a single core in a volcanic reconstruction. Sulfate concentration analysis of the 5 cores reveals that local scale variability, essentially attributed to snow drift and surface roughness at Dome C, can lead to a non-exhaustive record of volcanic events if a single core is used; on average 30% of the volcanic events are missing per core, and the uncertainty on the volcanic flux (up to 60%) is ... Doctoral or Postdoctoral Thesis Antarc* Antarctica Antarctique* ice core Université Savoie Mont Blanc: HAL |