EGU2020-5961, updated on 24 May 2023
https://doi.org/10.5194/egusphere-egu2020-5961
EGU General Assembly 2020
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Triple isotopic composition of oxygen in water and dioxygen during deglaciations recorded in the EPICA Dome C ice core to link climate, biosphere productivity and water cycle

Amaelle Landais1, Ji-Woong Yang1, Nicolas Pasquier1, Antoine Grisart1, Margaux Brandon1, Thomas Extier1, Frédéric Prié1, Bénédicte Minster1, Clément Piel2, Joana Sauze2, Alexandru Milcu2, Barbara Stenni3, and Thomas Blunier4
Amaelle Landais et al.
  • 1Laboratoire des Sciences du Climat et de l’Environnement (LSCE/IPSL/CEA/CNRS/UVSQ/UPS), UMR 8212, Gif-sur-Yvette, France
  • 2Ecotron Européen de Montpellier, UPS 3248, Centre National de la Recherche Scientifique (CNRS), Campus Baillarguet, Montferrier-sur-Lez, France
  • 3Department of Environmental Sciences, Informatics and Statistics, Ca’ Foscari University of Venice, Italy
  • 4Copenhagen Univ., Niels Bohr Institute, Centre for Ice and Climate, Juliane Maries Vej 30, DK-2100 Copenhagen, Denmark

High precision measurements of triple isotopic composition of oxygen in water is a useful tool to infer the dynamic of past hydrological cycle when measured in ice core together with δ18O and δD. In particular, the triple isotopic composition of oxygen in water provides information on the climatic conditions of the evaporative sources. In parallel, it has been shown that the triple isotopic composition of oxygen in the atmospheric dioxygen can be a useful tracer of the global biosphere productivity and hence reconstruct the dynamic of the global biosphere productivity in the past from measurements performed in the air bubbles. Measuring triple isotopic composition of oxygen both in the water and in the atmospheric dioxygen trapped in bubbles in ice cores is thus a strong added value to study the past variability of water cycle and biosphere productivity in parallel to climate change.

Here, we first present new laboratory experiments performed in closed biological chambers to show how the triple isotopic composition of oxygen in atmospheric dioxygen can be used for quantification of the biosphere productivity with determination of fractionation coefficients. Then, we present new records of triple isotopic composition of oxygen in water and O2 trapped in bubbles from the EPICA Dome C ice core over the deglaciations of the last 800 ka.

How to cite: Landais, A., Yang, J.-W., Pasquier, N., Grisart, A., Brandon, M., Extier, T., Prié, F., Minster, B., Piel, C., Sauze, J., Milcu, A., Stenni, B., and Blunier, T.: Triple isotopic composition of oxygen in water and dioxygen during deglaciations recorded in the EPICA Dome C ice core to link climate, biosphere productivity and water cycle, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-5961, https://doi.org/10.5194/egusphere-egu2020-5961, 2020.

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