Record of δ$^{18}$O and $^{17}$O-excess in ice from Vostok Antarctica during the last 150,000 years

• Published in: Geophysical Research Letters
• Main Authors: Landais, Amaelle, Barkan, Eugeni, Luz, Boaz
• Other Authors: Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE), 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)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Glaces et Continents, Climats et Isotopes Stables (GLACCIOS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-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)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), The Hebrew University of Jerusalem (HUJ), The Israel Science Foundation for grant 188/03-13.0, European Project: 37488,TICOPIC
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2008
• Subjects: [SDU.OCEAN]Sciences of the Universe [physics]/Ocean; Atmosphere; [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces; environment; Antarc*; Antarctic; Antarctica; ice core
• Online Access: https://hal.science/hal-03193005; https://hal.science/hal-03193005/document; https://hal.science/hal-03193005/file/2007GL032096.pdf; https://doi.org/10.1029/2007GL032096

International audience We measured δ$^{17}$O and $^{18}$O in recent Antarctic snow and down the Vostok ice core and calculated the excess of $^{17}$O with respect to VSMOW. The magnitude of the $^{17}$O excess in the Holocene and the last interglacial is ~45 per meg, and it remains constant in a transect from the coast to the continental interior. Analysis of the transect data shows that the $^{17}$O-excess is not sensitive to temperature variations over the continent. There are significant shifts in $^{17}$O-excess from low values in glacial to high values in interglacial times. The observed shifts suggest higher normalized relative humidity and/or wind speeds over the source oceanic regions in glacial times.