A major limitation of traditional methods of water sampling is that they do not adequately characterise the temporal and spatial variability in precipitation and stream waters. This is caused both by the practicalities of obtaining frequent samples and the cost implications of analysis. New technologies provide opportunities for overcoming such obstacles by using auto-samplers for field collection, and new laboratory equipment for analysis.

We are exploring how successfully such technology can be employed in catchment-scale field experiments. Our laboratory equipment includes a liquid-water laser isotope analyser that can measure δ18O and δD isotopes in water without requiring costly chemical consumables. The field and laboratory studies are also being linked with modelling analyses aimed at demonstrating the value of such data in improving understanding of transport processes.

Our research in this area focuses on:

• Automatic sampling and monitoring of isotopes in precipitation and stream water
• Application of a liquid-water laser isotope analyser
• Model based assessment of the value of high resolution data

Who is working in this area?

• Christian Birkel
• Sarah Dunn
• Helen Watson
• Carol Taylor
• Yvonne Cook

Keywords

• automatic sampling, laser isotope analyser, δ18O, δD