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

Noble-gas concentrations in ground water have been used as a proxy for past air temperatures 1 , 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 an...

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Veröffentlicht in:Nature (London) 2000-06, Vol.405 (6790), p.1040-1044
Hauptverfasser: Aeschbach-Hertig, W., Peeters, F., Beyerle, U., Kipfer, R.
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Peeters, F.
Beyerle, U.
Kipfer, R.
description Noble-gas concentrations in ground water have been used as a proxy for past air temperatures 1 , 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 understood 7 , 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 Maximum 4 has been called into question 9 . 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 soils 10 , 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 Maximum 4 , and indicate that even larger cooling took place at mid-latitudes.
doi_str_mv 10.1038/35016542
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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 Maximum 4 has been called into question 9 . 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 soils 10 , 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. 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subjects Air
Air temperature
Aquifers
Balancing
Brazil
Concentration (composition)
Cooling
Earth sciences
Earth, ocean, space
Environment
Exact sciences and technology
Gases
Geochemistry
Groundwater
Helium
Humanities and Social Sciences
Hydrogeology
Hydrology. Hydrogeology
letter
Mathematical models
Mineralogy
multidisciplinary
Noble gases
Rare gases
Reconstruction
Saturated soils
Science
Science (multidisciplinary)
Silicates
Temperature
Water geochemistry
title Palaeotemperature reconstruction from noble gases in ground water taking into account equilibration with entrapped air
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