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Summary: letters to nature
1040 NATURE |VOL 405 |29 JUNE 2000 |www.nature.com
Palaeotemperature reconstruction
from noble gases in ground water
taking into account equilibration
with entrapped air
W. Aeschbach-Hertig*², F. Peeters*, U. Beyerle* & R. Kipfer*³
* Department of Water Resources and Drinking Water, Swiss Federal Institute of
Environmental Science and Technology (EAWAG), CH-8600 DuÈbendorf,
Switzerland
² Environmental Physics, ³ Isotope Geology, Swiss Federal Institute of Technology
(ETH), CH-8902 Zurich, Switzerland
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Noble-gas concentrations in ground water have been used as a
proxy for past air temperatures1±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±9
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