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UP: Fachverband Umweltphysik

UP 2: Bodenphysik und Ozeanographie

UP 2.4: Talk

Tuesday, March 11, 2008, 12:30–12:45, 3B

New Insights in Inverse Modelling of Noble Gases in Groundwater — •Amany von Oehsen and Werner Aeschbach-Hertig — Institut für Umweltphysik, Heidelberg

Inverse Modelling of noble gases in groundwater provides an independent tool for reconstructing past temperatures and has been used as such in a number of studies. The method is based on the temperature dependence of noble gas solubility in water. In many cases concentrations are found to be above the equilibrium for atmospheric conditions, a phenomenon referred to in the literature as excess air. A variety of models have been developed to account for this finding, some of which are very different as to what physical processes play the dominant role. Models are judged according to their performance in a chisquare test. The talk will give an overview over the models and present new insights speaking for and against them.