On the relationship between δO2∕N2 variability and ice sheet surface conditions in Antarctica
While the processes controlling pore closure are broadly understood, the physical mechanisms driving the associated elemental fractionation remains ambiguous. Previous studies have shown that the pore closure process leads to a depletion in small-sized molecules (e.g. H-2, O-2, Ar, Ne, He) in ice co...
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Online Access: | https://hdl.handle.net/10278/5069642 https://doi.org/10.5194/tc-18-3741-2024 |
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ftuniveneziairis:oai:iris.unive.it:10278/5069642 2024-09-15T17:48:53+00:00 On the relationship between δO2∕N2 variability and ice sheet surface conditions in Antarctica Harris Stuart, Romilly Landais, Amaëlle Arnaud, Laurent Buizert, Christo Capron, Emilie Dumont, Marie Libois, Quentin Mulvaney, Robert Orsi, Anaïs Picard, Ghislain Prié, Frédéric Severinghaus, Jeffrey Stenni, Barbara Martinerie, Patricia Harris Stuart, Romilly Landais, Amaëlle Arnaud, Laurent Buizert, Christo Capron, Emilie Dumont, Marie Libois, Quentin Mulvaney, Robert Orsi, Anaï Picard, Ghislain Prié, Frédéric Severinghaus, Jeffrey Stenni, Barbara Martinerie, Patricia 2024 https://hdl.handle.net/10278/5069642 https://doi.org/10.5194/tc-18-3741-2024 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:001295951900001 volume:18 issue:8 firstpage:3741 lastpage:3763 numberofpages:23 journal:THE CRYOSPHERE https://hdl.handle.net/10278/5069642 doi:10.5194/tc-18-3741-2024 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85201771232 info:eu-repo/semantics/openAccess Settore GEO/08 - Geochimica e Vulcanologia info:eu-repo/semantics/article 2024 ftuniveneziairis https://doi.org/10.5194/tc-18-3741-2024 2024-09-02T23:38:03Z While the processes controlling pore closure are broadly understood, the physical mechanisms driving the associated elemental fractionation remains ambiguous. Previous studies have shown that the pore closure process leads to a depletion in small-sized molecules (e.g. H-2, O-2, Ar, Ne, He) in ice core bubbles relative to larger-sized molecules like N-2. This size-dependent fractionation, identified using ice core delta(O-2/N-2) records, exhibits a clear anti-correlation with local summer solstice insolation, making delta(O-2/N-2) a valuable ice core dating tool. Mechanisms controlling this relationship are attributed to the physical properties of deep firn. In this study, we compile delta(O-2/N-2) records from 15 polar ice cores and show a new additional link between delta(O-2/N-2) and local surface temperature and/or accumulation rate. Using the Crocus snowpack model, we perform sensitivity tests to identify the response of near-surface snow properties to changes in insolation intensity, accumulation rate, and air temperature. These tests support a mechanism linked to firn grain size, such that the larger the grain size for a given density, the stronger the pore closure fractionation and, hence, the lower the delta(O-2/N-2) values archived in the ice. Based on both snowpack model outputs and data compilation, our findings suggest that local accumulation rate and temperature should be considered when interpreting delta(O-2/N-2) as a local insolation proxy. Article in Journal/Newspaper Antarc* Antarctica ice core Ice Sheet Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) The Cryosphere 18 8 3741 3763 |
institution |
Open Polar |
collection |
Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) |
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ftuniveneziairis |
language |
English |
topic |
Settore GEO/08 - Geochimica e Vulcanologia |
spellingShingle |
Settore GEO/08 - Geochimica e Vulcanologia Harris Stuart, Romilly Landais, Amaëlle Arnaud, Laurent Buizert, Christo Capron, Emilie Dumont, Marie Libois, Quentin Mulvaney, Robert Orsi, Anaïs Picard, Ghislain Prié, Frédéric Severinghaus, Jeffrey Stenni, Barbara Martinerie, Patricia On the relationship between δO2∕N2 variability and ice sheet surface conditions in Antarctica |
topic_facet |
Settore GEO/08 - Geochimica e Vulcanologia |
description |
While the processes controlling pore closure are broadly understood, the physical mechanisms driving the associated elemental fractionation remains ambiguous. Previous studies have shown that the pore closure process leads to a depletion in small-sized molecules (e.g. H-2, O-2, Ar, Ne, He) in ice core bubbles relative to larger-sized molecules like N-2. This size-dependent fractionation, identified using ice core delta(O-2/N-2) records, exhibits a clear anti-correlation with local summer solstice insolation, making delta(O-2/N-2) a valuable ice core dating tool. Mechanisms controlling this relationship are attributed to the physical properties of deep firn. In this study, we compile delta(O-2/N-2) records from 15 polar ice cores and show a new additional link between delta(O-2/N-2) and local surface temperature and/or accumulation rate. Using the Crocus snowpack model, we perform sensitivity tests to identify the response of near-surface snow properties to changes in insolation intensity, accumulation rate, and air temperature. These tests support a mechanism linked to firn grain size, such that the larger the grain size for a given density, the stronger the pore closure fractionation and, hence, the lower the delta(O-2/N-2) values archived in the ice. Based on both snowpack model outputs and data compilation, our findings suggest that local accumulation rate and temperature should be considered when interpreting delta(O-2/N-2) as a local insolation proxy. |
author2 |
Harris Stuart, Romilly Landais, Amaëlle Arnaud, Laurent Buizert, Christo Capron, Emilie Dumont, Marie Libois, Quentin Mulvaney, Robert Orsi, Anaï Picard, Ghislain Prié, Frédéric Severinghaus, Jeffrey Stenni, Barbara Martinerie, Patricia |
format |
Article in Journal/Newspaper |
author |
Harris Stuart, Romilly Landais, Amaëlle Arnaud, Laurent Buizert, Christo Capron, Emilie Dumont, Marie Libois, Quentin Mulvaney, Robert Orsi, Anaïs Picard, Ghislain Prié, Frédéric Severinghaus, Jeffrey Stenni, Barbara Martinerie, Patricia |
author_facet |
Harris Stuart, Romilly Landais, Amaëlle Arnaud, Laurent Buizert, Christo Capron, Emilie Dumont, Marie Libois, Quentin Mulvaney, Robert Orsi, Anaïs Picard, Ghislain Prié, Frédéric Severinghaus, Jeffrey Stenni, Barbara Martinerie, Patricia |
author_sort |
Harris Stuart, Romilly |
title |
On the relationship between δO2∕N2 variability and ice sheet surface conditions in Antarctica |
title_short |
On the relationship between δO2∕N2 variability and ice sheet surface conditions in Antarctica |
title_full |
On the relationship between δO2∕N2 variability and ice sheet surface conditions in Antarctica |
title_fullStr |
On the relationship between δO2∕N2 variability and ice sheet surface conditions in Antarctica |
title_full_unstemmed |
On the relationship between δO2∕N2 variability and ice sheet surface conditions in Antarctica |
title_sort |
on the relationship between δo2∕n2 variability and ice sheet surface conditions in antarctica |
publishDate |
2024 |
url |
https://hdl.handle.net/10278/5069642 https://doi.org/10.5194/tc-18-3741-2024 |
genre |
Antarc* Antarctica ice core Ice Sheet |
genre_facet |
Antarc* Antarctica ice core Ice Sheet |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:001295951900001 volume:18 issue:8 firstpage:3741 lastpage:3763 numberofpages:23 journal:THE CRYOSPHERE https://hdl.handle.net/10278/5069642 doi:10.5194/tc-18-3741-2024 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85201771232 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-18-3741-2024 |
container_title |
The Cryosphere |
container_volume |
18 |
container_issue |
8 |
container_start_page |
3741 |
op_container_end_page |
3763 |
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1810290447054012416 |