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Hokkaido University Collection of Scholarly and Academic Papers >
Institute of Low Temperature Science >
低温科学 = Low Temperature Science >
vol. 68, Supplement Issue >
Combined Analysis of Water Stable Isotopes ($H_{2}^{16}O, H_{2}^{17}O, H_{2}^{18}O, HD^{16}O$) in Ice Cores
| Title: | Combined Analysis of Water Stable Isotopes ($H_{2}^{16}O, H_{2}^{17}O, H_{2}^{18}O, HD^{16}O$) in Ice Cores |
| Authors: | Landais, Amaelle Browse this author | | Barkan, Eugeni Browse this author | | Vimeux, Françoise Browse this author | | Masson-Delmotte, Valérie Browse this author | | Luz, Boaz Browse this author |
| Keywords: | ice core | | water isotopes | | water cycle | | relative humidity | | deglaciation |
| Issue Date: | Dec-2009 |
| Publisher: | Institute of Low Temperature Science, Hokkaido University |
| Citation: | Physics of Ice Core Records II : Papers collected after the 2nd International Workshop on Physics of Ice Core Records, held in Sapporo, Japan, 2-6 February 2007. Edited by Takeo Hondoh |
| Journal Title: | 低温科学 |
| Journal Title(alt): | Low Temperature Science |
| Volume: | 68 |
| Issue: | Supplement |
| Start Page: | 315 |
| End Page: | 327 |
| Abstract: | Water stable isotopes are currently measured in polar ice cores. The long records of $δ_{18}O$ and δD provide unique information on the past polar temperature while the combination of $δ_{18}O$ and δD constrains the evolution of the oceanic evaporative regions. Recently, new analytical developments have made it possible to measure with high precision a new isotopic ratio in water, $δ_{17}O$. As for δD and $δ_{18}0$, the combination of $δ_{17}0$ and $δ_{18}0$ shows a high dependence with the climatic conditions during evaporation. Based on measurements of the different isotopic ratios in Antarctica surface snow, we show that while the combination of $δ_{18}0$ and δD in the so-called d-excess displays variation with local climatic conditions in the polar regions in addition to the influence of the evaporative regions, the combination of $δ_{17}0$ and $δ_{18}0$ in the so-called $^{17}O_{excess}$ is not modified during the air mass transportation above the polar regions. This makes $^{17}O_{excess}$ a simpler parameter than d-excess to constrain the evolution of the oceanic evaporative regions. Finally, records of d-excess and $^{17}O_{excess}$ over the deglaciation in the Vostok ice core suggest significant changes in the evaporative regions. Our interpretation is that the relative humidity over the ocean was higher during the glacial period than today and that reevaporation increased over the deglaciation. |
| Description: | IV. Chemical properties and isotopes |
| Type: | bulletin (article) |
| URI: | http://hdl.handle.net/2115/45457 |
| Appears in Collections: | 低温科学 = Low Temperature Science > vol. 68, Supplement Issue
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Submitter: 低温科学研究所図書室
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