Deglaciation records of 17 O-excess in East Antarctica: reliable reconstruction of oceanic normalized relative humidity from coastal sites
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...
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ftdoajarticles:oai:doaj.org/article:f6ed6a9533a641699d8d40076e096540 2023-05-15T13:45:53+02:00 Deglaciation records of 17 O-excess in East Antarctica: reliable reconstruction of oceanic normalized relative humidity from coastal sites B. Stenni J. Jouzel V. Masson-Delmotte F. Prié L. Dümbgen H. Sodemann A. Landais R. Winkler 2012-01-01T00:00:00Z https://doi.org/10.5194/cp-8-1-2012 https://doaj.org/article/f6ed6a9533a641699d8d40076e096540 EN eng Copernicus Publications http://www.clim-past.net/8/1/2012/cp-8-1-2012.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-8-1-2012 1814-9324 1814-9332 https://doaj.org/article/f6ed6a9533a641699d8d40076e096540 Climate of the Past, Vol 8, Iss 1, Pp 1-16 (2012) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2012 ftdoajarticles https://doi.org/10.5194/cp-8-1-2012 2022-12-30T20:46:29Z 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 Directory of Open Access Journals: DOAJ Articles Antarctic East Antarctica Climate of the Past 8 1 1 16 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 B. Stenni J. Jouzel V. Masson-Delmotte F. Prié L. Dümbgen H. Sodemann A. Landais R. Winkler Deglaciation records of 17 O-excess in East Antarctica: reliable reconstruction of oceanic normalized relative humidity from coastal sites |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
B. Stenni J. Jouzel V. Masson-Delmotte F. Prié L. Dümbgen H. Sodemann A. Landais R. Winkler |
author_facet |
B. Stenni J. Jouzel V. Masson-Delmotte F. Prié L. Dümbgen H. Sodemann A. Landais R. Winkler |
author_sort |
B. Stenni |
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 |
Copernicus Publications |
publishDate |
2012 |
url |
https://doi.org/10.5194/cp-8-1-2012 https://doaj.org/article/f6ed6a9533a641699d8d40076e096540 |
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, Vol 8, Iss 1, Pp 1-16 (2012) |
op_relation |
http://www.clim-past.net/8/1/2012/cp-8-1-2012.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-8-1-2012 1814-9324 1814-9332 https://doaj.org/article/f6ed6a9533a641699d8d40076e096540 |
op_doi |
https://doi.org/10.5194/cp-8-1-2012 |
container_title |
Climate of the Past |
container_volume |
8 |
container_issue |
1 |
container_start_page |
1 |
op_container_end_page |
16 |
_version_ |
1766231955310903296 |