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Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 12, issue 4
Hydrol. Earth Syst. Sci., 12, 1065–1074, 2008
https://doi.org/10.5194/hess-12-1065-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.
Hydrol. Earth Syst. Sci., 12, 1065–1074, 2008
https://doi.org/10.5194/hess-12-1065-2008
© Author(s) 2008. This work is distributed under
the Creative Commons Attribution 3.0 License.

  05 Aug 2008

05 Aug 2008

Isotope hydrology of dripwaters in a Scottish cave and implications for stalagmite palaeoclimate research

L. Fuller1, A. Baker1, I. J. Fairchild1, C. Spötl2, A. Marca-Bell3, P. Rowe3, and P. F. Dennis3 L. Fuller et al.
  • 1School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, B15 2TT, UK
  • 2Department of Geology and Palaeontology, University of Innsbruck, Innrain 52, Innsbruck, 6020, Austria
  • 3School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, UK

Abstract. Dripwater hydrology and hydrogeochemistry is particularly useful in constraining the meaning of speleothem palaeoclimate archives, for example using δ18O signatures. Here, we calibrate the relationship between δ18O in precipitation, percolation waters and contemporary calcite deposits, at Tartair cave, Sutherland, NW Scotland, an Atlantic site sensitive to regional changes both of temperature and precipitation. Monthly precipitation displayed a 7.1‰ range in δ18O, a negative linear relationship with rainfall amount, and no correlation with temperature. Autogenically-derived cave percolation waters show little variation in δ18O during the same period and their annual weighted mean is the same as that of the local precipitation. This evidence together with hydrological data and electroconductivity values indicates that percolation waters are well mixed and dominated by stored water. Calculated values of δ18O of calcite deposited in this cave environment indicate that the cave deposits are forming close to isotopic equilibrium and kinetic effects are negligible. Comparison of a high-resolution δ18O stalagmite record with the instrumental record of climate indicates that isotopically heavy values are reflective of relatively cold, dry conditions (and vice-versa for warm, wet condition) and hence that stalagmite oxygen isotopes provide an appropriate means of investigating the palaeoclimate in this location.

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