Deglaciation records of 17 O-excess in East Antarctica: reliable reconstruction of oceanic normalized relative humidity from coastal sites
International audience We measured δ 17 O and δ 18 O in two Antarctic ice cores at EPICA Dome C (EDC) and TALDICE (TD), respectively, and computed 17 O-excess with respect to VSMOW. The comparison of our 17 O-excess data with the previous record obtained at Vostok (Landais et al., 2008a) revealed di...
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ftccsdartic:oai:HAL:hal-04114025v1 2023-06-18T03:38:09+02:00 Deglaciation records of 17 O-excess in East Antarctica: reliable reconstruction of oceanic normalized relative humidity from coastal sites Winkler, R. Landais, A. Sodemann, H. Dümbgen, L. Prié, F. Masson-Delmotte, V. Stenni, B. Jouzel, J. Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) 2012 https://hal.science/hal-04114025 https://doi.org/10.5194/cp-8-1-201210.5194/cpd-7-1845-2011 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-8-1-201210.5194/cpd-7-1845-2011 hal-04114025 https://hal.science/hal-04114025 BIBCODE: 2012CliPa.8.1W doi:10.5194/cp-8-1-201210.5194/cpd-7-1845-2011 Climate of the Past https://hal.science/hal-04114025 Climate of the Past, 2012, 8, pp.1-16. ⟨10.5194/cp-8-1-201210.5194/cpd-7-1845-2011⟩ Earth Science [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2012 ftccsdartic https://doi.org/10.5194/cp-8-1-201210.5194/cpd-7-1845-2011 2023-06-03T23:50:33Z International audience We measured δ 17 O and δ 18 O in two Antarctic ice cores at EPICA Dome C (EDC) and TALDICE (TD), respectively, and computed 17 O-excess with respect to VSMOW. The comparison of our 17 O-excess data with the previous record obtained at Vostok (Landais et al., 2008a) revealed differences up to 35 ppm in 17 O-excess mean level and evolution for the three sites. Our data show that the large increase depicted at Vostok (20 ppm) during the last deglaciation is a regional and not a general pattern in the temporal distribution of 17 O-excess in East Antarctica. The EDC data display an increase of 12 ppm, whereas the TD data show no significant variation from the Last Glacial Maximum (LGM) to the Early Holocene (EH). A Lagrangian moisture source diagnostic revealed very different source regions for Vostok and EDC compared to TD. These findings combined with the results of a sensitivity analysis, using a Rayleigh-type isotopic model, suggest that normalized relative humidity (RH n ) at the oceanic source region (OSR) is a determining factor for the spatial differences of 17 O-excess in East Antarctica. However, 17 O-excess in remote sites of continental Antarctica (e.g. Vostok) may be highly sensitive to local effects. Hence, we consider 17 O-excess in coastal East Antarctic ice cores (TD) to be more reliable as a proxy for RH n at the OSR. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica EPICA Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Antarctic East Antarctica |
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 |
Earth Science [SDU]Sciences of the Universe [physics] |
spellingShingle |
Earth Science [SDU]Sciences of the Universe [physics] Winkler, R. Landais, A. Sodemann, H. Dümbgen, L. Prié, F. Masson-Delmotte, V. Stenni, B. Jouzel, J. Deglaciation records of 17 O-excess in East Antarctica: reliable reconstruction of oceanic normalized relative humidity from coastal sites |
topic_facet |
Earth Science [SDU]Sciences of the Universe [physics] |
description |
International audience We measured δ 17 O and δ 18 O in two Antarctic ice cores at EPICA Dome C (EDC) and TALDICE (TD), respectively, and computed 17 O-excess with respect to VSMOW. The comparison of our 17 O-excess data with the previous record obtained at Vostok (Landais et al., 2008a) revealed differences up to 35 ppm in 17 O-excess mean level and evolution for the three sites. Our data show that the large increase depicted at Vostok (20 ppm) during the last deglaciation is a regional and not a general pattern in the temporal distribution of 17 O-excess in East Antarctica. The EDC data display an increase of 12 ppm, whereas the TD data show no significant variation from the Last Glacial Maximum (LGM) to the Early Holocene (EH). A Lagrangian moisture source diagnostic revealed very different source regions for Vostok and EDC compared to TD. These findings combined with the results of a sensitivity analysis, using a Rayleigh-type isotopic model, suggest that normalized relative humidity (RH n ) at the oceanic source region (OSR) is a determining factor for the spatial differences of 17 O-excess in East Antarctica. However, 17 O-excess in remote sites of continental Antarctica (e.g. Vostok) may be highly sensitive to local effects. Hence, we consider 17 O-excess in coastal East Antarctic ice cores (TD) to be more reliable as a proxy for RH n at the OSR. |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Winkler, R. Landais, A. Sodemann, H. Dümbgen, L. Prié, F. Masson-Delmotte, V. Stenni, B. Jouzel, J. |
author_facet |
Winkler, R. Landais, A. Sodemann, H. Dümbgen, L. Prié, F. Masson-Delmotte, V. Stenni, B. Jouzel, J. |
author_sort |
Winkler, R. |
title |
Deglaciation records of 17 O-excess in East Antarctica: reliable reconstruction of oceanic normalized relative humidity from coastal sites |
title_short |
Deglaciation records of 17 O-excess in East Antarctica: reliable reconstruction of oceanic normalized relative humidity from coastal sites |
title_full |
Deglaciation records of 17 O-excess in East Antarctica: reliable reconstruction of oceanic normalized relative humidity from coastal sites |
title_fullStr |
Deglaciation records of 17 O-excess in East Antarctica: reliable reconstruction of oceanic normalized relative humidity from coastal sites |
title_full_unstemmed |
Deglaciation records of 17 O-excess in East Antarctica: reliable reconstruction of oceanic normalized relative humidity from coastal sites |
title_sort |
deglaciation records of 17 o-excess in east antarctica: reliable reconstruction of oceanic normalized relative humidity from coastal sites |
publisher |
HAL CCSD |
publishDate |
2012 |
url |
https://hal.science/hal-04114025 https://doi.org/10.5194/cp-8-1-201210.5194/cpd-7-1845-2011 |
geographic |
Antarctic East Antarctica |
geographic_facet |
Antarctic East Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica EPICA |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica EPICA |
op_source |
Climate of the Past https://hal.science/hal-04114025 Climate of the Past, 2012, 8, pp.1-16. ⟨10.5194/cp-8-1-201210.5194/cpd-7-1845-2011⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-8-1-201210.5194/cpd-7-1845-2011 hal-04114025 https://hal.science/hal-04114025 BIBCODE: 2012CliPa.8.1W doi:10.5194/cp-8-1-201210.5194/cpd-7-1845-2011 |
op_doi |
https://doi.org/10.5194/cp-8-1-201210.5194/cpd-7-1845-2011 |
_version_ |
1769003015787773952 |