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Palaeotemperature reconstruction from noble gases in ground water taking into account equilibration with entrapped air

Author

Listed:
  • W. Aeschbach-Hertig

    (Swiss Federal Institute of Environmental Science and Technology (EAWAG)
    Environmental Physics)

  • F. Peeters

    (Swiss Federal Institute of Environmental Science and Technology (EAWAG))

  • U. Beyerle

    (Swiss Federal Institute of Environmental Science and Technology (EAWAG))

  • R. Kipfer

    (Swiss Federal Institute of Environmental Science and Technology (EAWAG)
    Isotope Geology, Swiss Federal Institute of Technology (ETH))

Abstract

Noble-gas concentrations in ground water have been used as a proxy for past air temperatures1,2,3,4,5,6,7, but the accuracy of this approach has been limited by the existence of a temperature-independent component of the noble gases in ground water, termed ‘excess air’, whose origin and composition is poorly understood7,8,9. In particular, the evidence from noble gases in a Brazilian aquifer for a cooling of more than 5 °C in tropical America during the Last Glacial Maximum4 has been called into question9. Here we propose a model for dissolved gases in ground water, which describes the formation of excess air by equilibration of ground water with entrapped air in quasi-saturated soils10,11,12. Our model predicts previously unexplained noble-gas data sets, including the concentration of atmospheric helium, and yields consistent results for the non-atmospheric helium isotopes that are used for dating ground water. Using this model of excess air, we re-evaluate the use of noble gases from ground water for reconstructing past temperatures. Our results corroborate the inferred cooling in Brazil during the Last Glacial Maximum4, and indicate that even larger cooling took place at mid-latitudes.

Suggested Citation

  • W. Aeschbach-Hertig & F. Peeters & U. Beyerle & R. Kipfer, 2000. "Palaeotemperature reconstruction from noble gases in ground water taking into account equilibration with entrapped air," Nature, Nature, vol. 405(6790), pages 1040-1044, June.
    • Handle: RePEc:nat:nature:v:405:y:2000:i:6790:d:10.1038_35016542
    DOI: 10.1038/35016542
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