She uses isotopes of hydrogen, oxygen and noble gases to determine theresidence time, circulation paths, mixing and sources of water. Applications of this work apply to groundwater mixing and recharge, salinization of aquifers, the Arctic Ocean freshwater cycle and arid-zone hydrology. Ekwurzel is analyzing isotopes in the groundwater to determine the sources of the water, its age and the sources of salinity. Xenon Isotopes as Tracers for Groundwater Recharge - This project uses xenon to track rapid recharge and groundwater movement. Xenon is ideal for this work because it is a noble gas and poses no health threats.
Current research includes areas in California.
Future research will focus on recharge issues in Tucson. 85Kr - This study compares and contrasts several methods used to date groundwater. This study will help researchers develop better models of vadose zone processes that are used to predict the risks posed by contaminants released into the vadose zone. This study of precipitation, surface water and groundwater found MTBE that would have gone undetected in previous studies. There also have been changes in freshwater circulation in that area.