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 core records. 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 moistu...
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fttriple:oai:gotriple.eu:BN1lUKae8eBRE59Ib3DH0 2023-05-15T13:50:25+02:00 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, B. 2018-09-27 https://doi.org/10.5194/cp-8-1109-2012 https://cp.copernicus.org/articles/8/1109/2012/ en eng Copernicus Publications doi:10.5194/cp-8-1109-2012 10670/1.pk6ktr 1814-9324 1814-9332 https://cp.copernicus.org/articles/8/1109/2012/ undefined Geographica Helvetica - geography eISSN: 1814-9332 geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.5194/cp-8-1109-2012 2023-01-22T17:39:39Z A single isotope ratio (δD or δ18O) of water is widely used as an air-temperature proxy in Antarctic ice core records. 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 (Δ Tsource) and at the precipitation site (Δ Tsite) can be retrieved by using deuterium-excess (d) data. A new d record from Dome Fuji, Antarctica spanning the past 360 000 yr is presented and compared with records from Vostok and EPICA Dome C ice cores. In previous studies, to retrieve Δ Tsource and Δ Tsite information, different linear regression equations were 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 Δ Tsite. We show that different ranges of temperature and selections of isotopic model outputs may increase the value of βsite by more than a factor of two. To explore the impacts of this coefficient on 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 Δ Tsource; (ii) the imprint of obliquity in Δ Tsource and in the site-source temperature gradient. By contrast, we highlight the robustness of Δ Tsite reconstruction using water isotopes records. Article in Journal/Newspaper Antarc* Antarctic Antarctica EPICA ice core Unknown Antarctic Dome Fuji ENVELOPE(39.700,39.700,-77.317,-77.317) Climate of the Past 8 3 1109 1125 |
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English |
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geo envir Uemura, R. Masson-Delmotte, V. Jouzel, J. Landais, A. Motoyama, H. Stenni, B. Ranges of moisture-source temperature estimated from Antarctic ice cores stable isotope records over glacial–interglacial cycles |
topic_facet |
geo envir |
description |
A single isotope ratio (δD or δ18O) of water is widely used as an air-temperature proxy in Antarctic ice core records. 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 (Δ Tsource) and at the precipitation site (Δ Tsite) can be retrieved by using deuterium-excess (d) data. A new d record from Dome Fuji, Antarctica spanning the past 360 000 yr is presented and compared with records from Vostok and EPICA Dome C ice cores. In previous studies, to retrieve Δ Tsource and Δ Tsite information, different linear regression equations were 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 Δ Tsite. We show that different ranges of temperature and selections of isotopic model outputs may increase the value of βsite by more than a factor of two. To explore the impacts of this coefficient on 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 Δ Tsource; (ii) the imprint of obliquity in Δ Tsource and in the site-source temperature gradient. By contrast, we highlight the robustness of Δ Tsite reconstruction using water isotopes records. |
format |
Article in Journal/Newspaper |
author |
Uemura, R. Masson-Delmotte, V. Jouzel, J. Landais, A. Motoyama, H. Stenni, B. |
author_facet |
Uemura, R. Masson-Delmotte, V. Jouzel, J. Landais, A. Motoyama, H. Stenni, B. |
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 |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-8-1109-2012 https://cp.copernicus.org/articles/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 ice core |
genre_facet |
Antarc* Antarctic Antarctica EPICA ice core |
op_source |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-8-1109-2012 10670/1.pk6ktr 1814-9324 1814-9332 https://cp.copernicus.org/articles/8/1109/2012/ |
op_rights |
undefined |
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 |
_version_ |
1766253483117248512 |