Deglaciation records of 17O-excess in East Antarctica: reliable reconstruction of oceanic normalized relative humidity from coastal sites
| Autor: | Winkler, R., Landais, A., Sodemann, H., Dümbgen, L., Prié, F., Masson-Delmotte, V., Stenni, B., Jouzel, J. |
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| Přispěvatelé: | Winkler, R., Landais, A., Sodemann, H., Dumbgen, L., Prié, F., Masson Delmotte, V., Stenni, Barbara, Jouzel, J., Laboratoire des Sciences du Climat et de l'Environnement [Gif-sur-Yvette] (LSCE), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Glaces et Continents, Climats et Isotopes Stables (GLACCIOS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ), Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), University of Bern, University of Trieste, 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), 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)-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), Università degli studi di Trieste = University of Trieste |
| Jazyk: | angličtina |
| Rok vydání: | 2012 |
| Předmět: |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere water stable isotope moisture source regions lcsh:GE1-350 EPICA Dome C lcsh:Environmental protection water stable isotopes ice cores TALDICE 17O-excess Antarctica Vostok lcsh:Environmental pollution lcsh:TD172-193.5 17O-exce lcsh:TD169-171.8 moisture source region [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment ice core ComputingMilieux_MISCELLANEOUS lcsh:Environmental sciences |
| Zdroj: | Climate of the Past, 8 (1) Climate of the Past, Vol 8, Iss 1, Pp 1-16 (2012) Winkler, R.; Landais, A.; Sodemann, H.; Dümbgen, L.; Prié, F.; Masson-Delmotte, V.; Stenni, B.; Jouzel, J. (2012). Deglaciation records of 17O-excess in East Antarctica: reliable reconstruction of oceanic normalized relative humidity from coastal sites. Climate of the past, 8(1), pp. 1-16. Göttingen: Copernicus Publications 10.5194/cp-8-1-2012 Climate of the Past Climate of the Past, European Geosciences Union (EGU), 2012, 8 (1), pp.1-16. ⟨10.5194/CP-8-1-2012⟩ Climate of the Past, 2012, 8 (1), pp.1-16. ⟨10.5194/CP-8-1-2012⟩ |
| ISSN: | 1814-9332 1814-9324 |
| DOI: | 10.5194/cp-8-1-2012 |
| Popis: | We measured δ17O and δ18O in two Antarctic ice cores at EPICA Dome C (EDC) and TALDICE (TD), respectively, and computed 17O-excess with respect to VSMOW. The comparison of our 17O-excess data with the previous record obtained at Vostok (Landais et al., 2008a) revealed differences up to 35 ppm in 17O-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 17O-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 (RHn) at the oceanic source region (OSR) is a determining factor for the spatial differences of 17O-excess in East Antarctica. However, 17O-excess in remote sites of continental Antarctica (e.g. Vostok) may be highly sensitive to local effects. Hence, we consider 17O-excess in coastal East Antarctic ice cores (TD) to be more reliable as a proxy for RHn at the OSR. |
| Databáze: | OpenAIRE |
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