Chapter 5 : Noble Gas Thermometry in Groundwater Hydrology

by W. Aeschbach-Hertig and D.K. Solomon

Concentrations of dissolved atmospheric noble gases in water constitute a thermometer, whose application to the groundwater archive provides a method of paleoclimate reconstruction. In addition, noble gases have found wide application as tracers in hydrogeology. This chapter reviews the historical development, the theoretical foundations, the sampling and analytical techniques, as well as the spectrum of applications of this important tool of modern tracer hydrology. A detailed account of currently available sampling techniques is given, as this information is of great practical importance but not fully available in the scientific literature. The analytical methods are better documented in the literature, although the many lab-specific details and constant development make it hard to provide an authoritative overview, so that this part is kept comparatively short. The focus of the chapter lies on the methods for data reduction and interpretation, which have undergone rapid and important development in the recent past. Nevertheless, in this respect still substantial research needs exist. Finally, this chapter provides an overview of applications of noble gases in groundwater hydrology, which range from the classical paleothermometry and the determination of other paleoclimate parameters such as humidity to various hydrological investigations, such as groundwater dating or the study of water origin and recharge conditions in hydrothermal, glaciated, alluvial, coastal, and mountainous aquifer systems.

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Chapter 5

14 mai 2012
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