Multi-tracer study of gas trapping in an East Antarctic ice core
International audience We study a firn and ice core drilled at the new "Lock-In" site in East Antarctica, located 136 km away from Concordia station towards Durmont d'Urville. High resolution chemical and physical measurements were performed on the core, with a particular focus on the...
Main Authors: | , , , , , , , , , , , , |
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Other Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2019
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Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-02389077 https://hal.archives-ouvertes.fr/hal-02389077v2/document https://hal.archives-ouvertes.fr/hal-02389077v2/file/Fourteau%20et%20al.%20-%202019%20-%20The%20Cryosphere.pdf https://doi.org/10.5194/tc-2019-89 |
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ftccsdartic:oai:HAL:hal-02389077v2 |
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record_format |
openpolar |
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 |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
spellingShingle |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology Fourteau, Kévin Martinerie, Patricia Fain, Xavier Schaller, Christoph, Tuckwell, Rebecca, Löwe, Henning Arnaud, Laurent Magand, Olivier Thomas, Elizabeth, Freitag, Johannes, Mulvaney, Robert Schneebeli, Martin Lipenkov, Vladimir Multi-tracer study of gas trapping in an East Antarctic ice core |
topic_facet |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology |
description |
International audience We study a firn and ice core drilled at the new "Lock-In" site in East Antarctica, located 136 km away from Concordia station towards Durmont d'Urville. High resolution chemical and physical measurements were performed on the core, with a particular focus on the trapping zone of the firn where air bubbles are formed. We measured the air content in the ice, closed and open porous volumes in the firn, firn density, firn liquid conductivity and major ion concentrations, as well as methane concentrations in the ice. The closed and open porosity volumes of firn samples were obtained by the two independent methods of pycnometry and tomography, that yield similar results. The measured increase of the closed porosity with density is used to estimate the air content trapped in the ice with the aid of a simple gas trapping model. Results show a discrepancy, with the model trapping too much air. Experimental errors have been considered but do not explain the discrepancy between the model and the observations. The model and data can be reconciled with the introduction of a reduced compression of the closed porosity compared to the open porosity. Yet, it is not clear if this limited compression of closed pores is the actual mechanism responsible for the low amount of air in the ice. High resolution density measurements reveal the presence of a strong layering, manifesting itself as centimeter scale variations. Despite this heterogeneous stratification, all layers, including the ones that are especially dense or less dense compared to their surroundings, display similar pore morphology and closed porosity as function of density. This implies that all layers close in a similar way, even though some close in advance or later compared to the bulk firn. Investigation of the chemistry data suggests that in the trapping zone, the observed stratification is partly related to the presence of chemical impurities. |
author2 |
Institut des Géosciences de l’Environnement (IGE) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Recherche pour le Développement (IRD)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Alfred Wegener Institute Potsdam Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI) British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Institut Fédéral de Recherches sur la Forêt, la Neige et le Paysage (WSL) Institut Fédéral de Recherches Suisse Arctic and Antarctic Research Institute (AARI) Russian Federal Service for Hydrometeorology and Environmental Monitoring (Roshydromet) |
format |
Article in Journal/Newspaper |
author |
Fourteau, Kévin Martinerie, Patricia Fain, Xavier Schaller, Christoph, Tuckwell, Rebecca, Löwe, Henning Arnaud, Laurent Magand, Olivier Thomas, Elizabeth, Freitag, Johannes, Mulvaney, Robert Schneebeli, Martin Lipenkov, Vladimir |
author_facet |
Fourteau, Kévin Martinerie, Patricia Fain, Xavier Schaller, Christoph, Tuckwell, Rebecca, Löwe, Henning Arnaud, Laurent Magand, Olivier Thomas, Elizabeth, Freitag, Johannes, Mulvaney, Robert Schneebeli, Martin Lipenkov, Vladimir |
author_sort |
Fourteau, Kévin |
title |
Multi-tracer study of gas trapping in an East Antarctic ice core |
title_short |
Multi-tracer study of gas trapping in an East Antarctic ice core |
title_full |
Multi-tracer study of gas trapping in an East Antarctic ice core |
title_fullStr |
Multi-tracer study of gas trapping in an East Antarctic ice core |
title_full_unstemmed |
Multi-tracer study of gas trapping in an East Antarctic ice core |
title_sort |
multi-tracer study of gas trapping in an east antarctic ice core |
publisher |
HAL CCSD |
publishDate |
2019 |
url |
https://hal.archives-ouvertes.fr/hal-02389077 https://hal.archives-ouvertes.fr/hal-02389077v2/document https://hal.archives-ouvertes.fr/hal-02389077v2/file/Fourteau%20et%20al.%20-%202019%20-%20The%20Cryosphere.pdf https://doi.org/10.5194/tc-2019-89 |
long_lat |
ENVELOPE(123.333,123.333,-75.100,-75.100) |
geographic |
Antarctic Concordia Station East Antarctica |
geographic_facet |
Antarctic Concordia Station East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica ice core The Cryosphere |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica ice core The Cryosphere |
op_source |
ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.archives-ouvertes.fr/hal-02389077 The Cryosphere, Copernicus In press, 13 (12), pp.3383-3403. ⟨10.5194/tc-2019-89⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-2019-89 hal-02389077 https://hal.archives-ouvertes.fr/hal-02389077 https://hal.archives-ouvertes.fr/hal-02389077v2/document https://hal.archives-ouvertes.fr/hal-02389077v2/file/Fourteau%20et%20al.%20-%202019%20-%20The%20Cryosphere.pdf doi:10.5194/tc-2019-89 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/tc-2019-89 |
_version_ |
1766063545182584832 |
spelling |
ftccsdartic:oai:HAL:hal-02389077v2 2023-05-15T13:35:15+02:00 Multi-tracer study of gas trapping in an East Antarctic ice core Fourteau, Kévin Martinerie, Patricia Fain, Xavier Schaller, Christoph, Tuckwell, Rebecca, Löwe, Henning Arnaud, Laurent Magand, Olivier Thomas, Elizabeth, Freitag, Johannes, Mulvaney, Robert Schneebeli, Martin Lipenkov, Vladimir Institut des Géosciences de l’Environnement (IGE) Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut de Recherche pour le Développement (IRD)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) Alfred Wegener Institute Potsdam Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung (AWI) British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Institut Fédéral de Recherches sur la Forêt, la Neige et le Paysage (WSL) Institut Fédéral de Recherches Suisse Arctic and Antarctic Research Institute (AARI) Russian Federal Service for Hydrometeorology and Environmental Monitoring (Roshydromet) 2019 https://hal.archives-ouvertes.fr/hal-02389077 https://hal.archives-ouvertes.fr/hal-02389077v2/document https://hal.archives-ouvertes.fr/hal-02389077v2/file/Fourteau%20et%20al.%20-%202019%20-%20The%20Cryosphere.pdf https://doi.org/10.5194/tc-2019-89 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-2019-89 hal-02389077 https://hal.archives-ouvertes.fr/hal-02389077 https://hal.archives-ouvertes.fr/hal-02389077v2/document https://hal.archives-ouvertes.fr/hal-02389077v2/file/Fourteau%20et%20al.%20-%202019%20-%20The%20Cryosphere.pdf doi:10.5194/tc-2019-89 info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://hal.archives-ouvertes.fr/hal-02389077 The Cryosphere, Copernicus In press, 13 (12), pp.3383-3403. ⟨10.5194/tc-2019-89⟩ [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.GL]Sciences of the Universe [physics]/Earth Sciences/Glaciology info:eu-repo/semantics/article Journal articles 2019 ftccsdartic https://doi.org/10.5194/tc-2019-89 2021-11-07T00:30:07Z International audience We study a firn and ice core drilled at the new "Lock-In" site in East Antarctica, located 136 km away from Concordia station towards Durmont d'Urville. High resolution chemical and physical measurements were performed on the core, with a particular focus on the trapping zone of the firn where air bubbles are formed. We measured the air content in the ice, closed and open porous volumes in the firn, firn density, firn liquid conductivity and major ion concentrations, as well as methane concentrations in the ice. The closed and open porosity volumes of firn samples were obtained by the two independent methods of pycnometry and tomography, that yield similar results. The measured increase of the closed porosity with density is used to estimate the air content trapped in the ice with the aid of a simple gas trapping model. Results show a discrepancy, with the model trapping too much air. Experimental errors have been considered but do not explain the discrepancy between the model and the observations. The model and data can be reconciled with the introduction of a reduced compression of the closed porosity compared to the open porosity. Yet, it is not clear if this limited compression of closed pores is the actual mechanism responsible for the low amount of air in the ice. High resolution density measurements reveal the presence of a strong layering, manifesting itself as centimeter scale variations. Despite this heterogeneous stratification, all layers, including the ones that are especially dense or less dense compared to their surroundings, display similar pore morphology and closed porosity as function of density. This implies that all layers close in a similar way, even though some close in advance or later compared to the bulk firn. Investigation of the chemistry data suggests that in the trapping zone, the observed stratification is partly related to the presence of chemical impurities. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica ice core The Cryosphere Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic Concordia Station ENVELOPE(123.333,123.333,-75.100,-75.100) East Antarctica |