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 Dumont d'Urville. High-resolution chemical and physical measurements were performed on the core, with a particular focus on the...
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ftinsu:oai:HAL:insu-03706488v1 2024-04-28T07:57:59+00:00 Multi-tracer study of gas trapping in an East Antarctic ice core Fourteau, Kévin Martinerie, Patricia Faïn, Xavier Schaller, Christoph F. Tuckwell, Rebecca J. Löwe, Henning Arnaud, Laurent Magand, Olivier Thomas, Elizabeth R. Freitag, Johannes Mulvaney, Robert Schneebeli, Martin Lipenkov, Vladimir Ya. Institut des Géosciences de l’Environnement (IGE) Institut de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) 2019 https://insu.hal.science/insu-03706488 https://insu.hal.science/insu-03706488/document https://insu.hal.science/insu-03706488/file/tc-13-3383-2019.pdf https://doi.org/10.5194/tc-13-3383-2019 en eng HAL CCSD Copernicus info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-13-3383-2019 insu-03706488 https://insu.hal.science/insu-03706488 https://insu.hal.science/insu-03706488/document https://insu.hal.science/insu-03706488/file/tc-13-3383-2019.pdf BIBCODE: 2019TCry.13.3383F doi:10.5194/tc-13-3383-2019 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 1994-0424 EISSN: 1994-0416 The Cryosphere https://insu.hal.science/insu-03706488 The Cryosphere, 2019, 13, pp.3383-3403. ⟨10.5194/tc-13-3383-2019⟩ [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2019 ftinsu https://doi.org/10.5194/tc-13-3383-2019 2024-04-05T00:32:43Z 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 Dumont 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, major ion concentrations, and methane concentrations in the ice. The closed and open porosity volumes of firn samples were obtained using the two independent methods of pycnometry and tomography, which yield similar results. The measured increase in 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 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 a 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 Institut national des sciences de l'Univers: HAL-INSU The Cryosphere 13 12 3383 3403 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU]Sciences of the Universe [physics] |
spellingShingle |
[SDU]Sciences of the Universe [physics] Fourteau, Kévin Martinerie, Patricia Faïn, Xavier Schaller, Christoph F. Tuckwell, Rebecca J. Löwe, Henning Arnaud, Laurent Magand, Olivier Thomas, Elizabeth R. Freitag, Johannes Mulvaney, Robert Schneebeli, Martin Lipenkov, Vladimir Ya. Multi-tracer study of gas trapping in an East Antarctic ice core |
topic_facet |
[SDU]Sciences of the Universe [physics] |
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 Dumont 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, major ion concentrations, and methane concentrations in the ice. The closed and open porosity volumes of firn samples were obtained using the two independent methods of pycnometry and tomography, which yield similar results. The measured increase in 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 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 a 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 de Recherche pour le Développement (IRD)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes 2016-2019 (UGA 2016-2019 ) |
format |
Article in Journal/Newspaper |
author |
Fourteau, Kévin Martinerie, Patricia Faïn, Xavier Schaller, Christoph F. Tuckwell, Rebecca J. Löwe, Henning Arnaud, Laurent Magand, Olivier Thomas, Elizabeth R. Freitag, Johannes Mulvaney, Robert Schneebeli, Martin Lipenkov, Vladimir Ya. |
author_facet |
Fourteau, Kévin Martinerie, Patricia Faïn, Xavier Schaller, Christoph F. Tuckwell, Rebecca J. Löwe, Henning Arnaud, Laurent Magand, Olivier Thomas, Elizabeth R. Freitag, Johannes Mulvaney, Robert Schneebeli, Martin Lipenkov, Vladimir Ya. |
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://insu.hal.science/insu-03706488 https://insu.hal.science/insu-03706488/document https://insu.hal.science/insu-03706488/file/tc-13-3383-2019.pdf https://doi.org/10.5194/tc-13-3383-2019 |
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://insu.hal.science/insu-03706488 The Cryosphere, 2019, 13, pp.3383-3403. ⟨10.5194/tc-13-3383-2019⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/tc-13-3383-2019 insu-03706488 https://insu.hal.science/insu-03706488 https://insu.hal.science/insu-03706488/document https://insu.hal.science/insu-03706488/file/tc-13-3383-2019.pdf BIBCODE: 2019TCry.13.3383F doi:10.5194/tc-13-3383-2019 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/tc-13-3383-2019 |
container_title |
The Cryosphere |
container_volume |
13 |
container_issue |
12 |
container_start_page |
3383 |
op_container_end_page |
3403 |
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1797591247806791680 |