Ranges of moisture-source temperature estimated from Antarctic ice cores stable isotope records over glacial–interglacial cycles
A single isotope ratio (δD or δ18O) of water is widely used as an air-temperature proxy in Antarctic ice cores. These isotope ratios, however, do not solely depend on air-temperature but also on the extent of distillation of heavy isotopes out of atmospheric water vapor from an oceanic moisture sour...
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Online Access: | http://hdl.handle.net/10278/42759 https://doi.org/10.5194/cp-8-1109-2012 |
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ftuniveneziairis:oai:iris.unive.it:10278/42759 2024-04-14T08:02:24+00:00 Ranges of moisture-source temperature estimated from Antarctic ice cores stable isotope records over glacial–interglacial cycles Uemura R. Masson Delmotte V. Jouzel J. Landais A. Motoyama H. STENNI, Barbara Uemura, R. Masson Delmotte, V. Jouzel, J. Landais, A. Motoyama, H. Stenni, Barbara 2012 http://hdl.handle.net/10278/42759 https://doi.org/10.5194/cp-8-1109-2012 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000305830200019 volume:8 firstpage:1109 lastpage:1125 numberofpages:17 journal:CLIMATE OF THE PAST http://hdl.handle.net/10278/42759 doi:10.5194/cp-8-1109-2012 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84863461658 info:eu-repo/semantics/openAccess info:eu-repo/semantics/article 2012 ftuniveneziairis https://doi.org/10.5194/cp-8-1109-2012 2024-03-21T18:03:28Z A single isotope ratio (δD or δ18O) of water is widely used as an air-temperature proxy in Antarctic ice cores. These isotope ratios, however, do not solely depend on air-temperature but also on the extent of distillation of heavy isotopes out of atmospheric water vapor from an oceanic moisture source to a precipitation site. The temperature changes at the oceanic moisture source (ΔTsource) and at the precipitation site (ΔTsite) can be retrieved by using deuterium-excess (d) data. A new d record from Dome Fuji, Antarctica is produced spanning the past 360,000 years and compared with records from Vostok and EPICA Dome C ice cores. To retrieve ΔTsource and ΔTsite information, different linear regression equations have been proposed using theoretical isotope distillation models. A major source of uncertainty lies in the coefficient of regression, βsite which is related to the sensitivity of d to ΔTsite. We show that different ranges of temperature and selections of isotopic model outputs may increase the value of βsite by a factor of two. To explore the impacts of this coefficient on the reconstructed temperatures, we apply for the first time the exact same methodology to the isotope records from the three Antarctica ice cores. We show that uncertainties in the βsite coefficient strongly affect (i) the glacial-interglacial magnitude of ΔTsource; (ii) the imprint of obliquity in ΔTsource and in the site-source temperature gradient. By contrast, we highlight the robustness of ΔTsite reconstruction using water isotopes records. Article in Journal/Newspaper Antarc* Antarctic Antarctica EPICA Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) Antarctic Dome Fuji ENVELOPE(39.700,39.700,-77.317,-77.317) Climate of the Past 8 3 1109 1125 |
institution |
Open Polar |
collection |
Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) |
op_collection_id |
ftuniveneziairis |
language |
English |
description |
A single isotope ratio (δD or δ18O) of water is widely used as an air-temperature proxy in Antarctic ice cores. These isotope ratios, however, do not solely depend on air-temperature but also on the extent of distillation of heavy isotopes out of atmospheric water vapor from an oceanic moisture source to a precipitation site. The temperature changes at the oceanic moisture source (ΔTsource) and at the precipitation site (ΔTsite) can be retrieved by using deuterium-excess (d) data. A new d record from Dome Fuji, Antarctica is produced spanning the past 360,000 years and compared with records from Vostok and EPICA Dome C ice cores. To retrieve ΔTsource and ΔTsite information, different linear regression equations have been proposed using theoretical isotope distillation models. A major source of uncertainty lies in the coefficient of regression, βsite which is related to the sensitivity of d to ΔTsite. We show that different ranges of temperature and selections of isotopic model outputs may increase the value of βsite by a factor of two. To explore the impacts of this coefficient on the reconstructed temperatures, we apply for the first time the exact same methodology to the isotope records from the three Antarctica ice cores. We show that uncertainties in the βsite coefficient strongly affect (i) the glacial-interglacial magnitude of ΔTsource; (ii) the imprint of obliquity in ΔTsource and in the site-source temperature gradient. By contrast, we highlight the robustness of ΔTsite reconstruction using water isotopes records. |
author2 |
Uemura, R. Masson Delmotte, V. Jouzel, J. Landais, A. Motoyama, H. Stenni, Barbara |
format |
Article in Journal/Newspaper |
author |
Uemura R. Masson Delmotte V. Jouzel J. Landais A. Motoyama H. STENNI, Barbara |
spellingShingle |
Uemura R. Masson Delmotte V. Jouzel J. Landais A. Motoyama H. STENNI, Barbara Ranges of moisture-source temperature estimated from Antarctic ice cores stable isotope records over glacial–interglacial cycles |
author_facet |
Uemura R. Masson Delmotte V. Jouzel J. Landais A. Motoyama H. STENNI, Barbara |
author_sort |
Uemura R. |
title |
Ranges of moisture-source temperature estimated from Antarctic ice cores stable isotope records over glacial–interglacial cycles |
title_short |
Ranges of moisture-source temperature estimated from Antarctic ice cores stable isotope records over glacial–interglacial cycles |
title_full |
Ranges of moisture-source temperature estimated from Antarctic ice cores stable isotope records over glacial–interglacial cycles |
title_fullStr |
Ranges of moisture-source temperature estimated from Antarctic ice cores stable isotope records over glacial–interglacial cycles |
title_full_unstemmed |
Ranges of moisture-source temperature estimated from Antarctic ice cores stable isotope records over glacial–interglacial cycles |
title_sort |
ranges of moisture-source temperature estimated from antarctic ice cores stable isotope records over glacial–interglacial cycles |
publishDate |
2012 |
url |
http://hdl.handle.net/10278/42759 https://doi.org/10.5194/cp-8-1109-2012 |
long_lat |
ENVELOPE(39.700,39.700,-77.317,-77.317) |
geographic |
Antarctic Dome Fuji |
geographic_facet |
Antarctic Dome Fuji |
genre |
Antarc* Antarctic Antarctica EPICA |
genre_facet |
Antarc* Antarctic Antarctica EPICA |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000305830200019 volume:8 firstpage:1109 lastpage:1125 numberofpages:17 journal:CLIMATE OF THE PAST http://hdl.handle.net/10278/42759 doi:10.5194/cp-8-1109-2012 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84863461658 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-8-1109-2012 |
container_title |
Climate of the Past |
container_volume |
8 |
container_issue |
3 |
container_start_page |
1109 |
op_container_end_page |
1125 |
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1796314657421524992 |