Combined Analysis of Water Stable Isotopes (H_[2]^[16]O, H_[2]^[17]O, H_[2]^[18]O, HD^[16]O) in Ice Cores
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Water stable isotopes are currently measured in polar ice cores. The long records of δ18O and δD provide unique information on the past polar temperature while the combination of δ18O 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, δ170. As for δD and δ180, the combination of δ170 and δ180 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 δ180 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 δ170 and δ180 in the so-called 170excess is not modified during the air mass transportation above the polar regions. This makes 170excess a simpler parameter than d-excess to constrain the evolution of the oceanic evaporative regions. Finally, records of d-excess and 170excess 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.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
- Institute of Low Temperature Science, Hokkaido Universityの論文
Institute of Low Temperature Science, Hokkaido University | 論文
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