Groundwater age dating with chlorofluorocarbons

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Karen Polinesia (20)
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About me

Dating groundwater with dissolved silica and CFC concentrations in crystalline aquifers

Groundwater, Age of Groundwater, Age of The age of groundwater is defined as the time that has elapsed since the water first entered the aquifer. For example, some of the rain that falls on an area percolates trickles down through soil and rock until it reaches the water table. Once this water reaches the water table, it moves though the aquifer. The time it takes to travel to a given location, known as the groundwater age, can vary from days to thousands of years. Measuring Groundwater Ages in Years Hydrologists employ a variety of techniques to measure groundwater age. For relatively young groundwater, chlorofluorocarbons CFCs often are used. CFCs are human-made compounds that are stable in the environment. Atmospheric CFC concentrations increased from the time of their development in the s until the s, and hydrologists now know how atmospheric CFC concentrations have changed over time. CFCs can be used to determine groundwater age because water that is in contact with the atmosphere picks up CFCs from the atmosphere. Thus, CFCs are incorporated in the water before it enters an aquifer.

Using Man Made Gases as Groundwater 'Age' Tracers Contributed by Daren Gooddy, British Geological Survey Environmental tracers are natural or man made anthropogenic compounds or isotopes that are widely distributed in the near-surface environment. Variations in their quantities can be used to determine pathways and timescales of environmental processes. They include naturally occurring isotopes such as carbon and anthropogenic tracers such as Chlorofluorcarbons CFCs. Releases of anthropogenic environmental tracers include catastrophic events such as nuclear bomb testing releasing, as well as gradual leakage of tracers from industrial production processes.

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Estimating intermediate water residence times a few years to a century in shallow aquifers is critical to quantifying groundwater vulnerability to nutrient loading and estimating realistic recovery timelines. While intermediate groundwater residence times are currently determined with atmospheric tracers such as chlorofluorocarbons CFCs , these analyses are costly and would benefit from other tracer approaches to compensate for the decreasing resolution of CFC methods in the 5—20 years range. In this context, we developed a framework to assess the capacity of dissolved silica DSi to inform residence times in shallow aquifers. We calibrated silicate weathering rates with CFCs from multiple wells in five crystalline aquifers in Brittany and in the Vosges Mountains France. DSi and CFCs were complementary in determining apparent weathering reactions and residence time distributions RTDs in shallow aquifers. Silicate weathering rates were surprisingly similar among Brittany aquifers, varying from 0.

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Department Water Resources and Drinking Water

Text is taken from: Solomon Recent advances in dating young groundwater: Chlorofluorocarbons CFCs Chlorofluorocarbons CFCs are man-made organic compounds which are produced for a range of industrial and domestic purposes Rowland, Concentrations of these CFCs in ocean basins have been used to study mixing processes, and the movement of deep ocean currents Trumbore et al. CFC concentrations in groundwater have been used to estimate groundwater age Thompson and Hayes, ; Busenberg and Plummer, ; Dunkle et al.

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