Cfc Groundwater Dating
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USGS Groundwater Dating Lab
Groundwater age dating with chlorofluorocarbons - Oster . . .
Coupling 3D groundwater modeling with CFC-based age dating . . .
PDF Using CFCs and SF6 for groundwater dating and tracing: a . . .
Accuracy of CFC groundwater dating in a crystalline . . .
(PDF) Accuracy of CFC groundwater dating in a crystalline . . .
Application of chlorofluorocarbons (CFCs) to estimate the . . .
Dating groundwater with dissolved silica and CFC . . .
Accuracy of CFC groundwater dating in a crystalline . . .
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The Reston Groundwater Dating Laboratory provides analytical services for chlorofluorocarbons ( CFCs ), sulfur hexafluoride (SF 6) and other dissolved gases including N 2, Ar, CO 2, CH 4, O 2 . The data generated by the Groundwater Dating Laboratory are being used throughout the USGS in hydrologic studies .
However, in soil air above the groundwater table the CFC excess variation is low-pass filtered, allowing reconstruction of the site-specific CFC input anomaly in relation to the global background . Thus local CFC soil air measurements can provide a valuable local correction factor for CFC dating and extend the applicability of CFC studies in specific environments .
We used groundwater dating and numerical modeling techniques to assess transit time and flow path in an unconfined aquifer in Brittany, France . The 35 .5 km 2 study catchment has a crystalline basement underneath a ∼60 m thick weathered and fractured layer, and is separated into a distinct upland and lowland area by an 80 m-high butte . We used groundwater discharge and groundwater ages derived from chlorofluorocarbon ( CFC ) concentration to calibrate a free-surface flow model simulating . . .
a readily-available way of dating young (i .e . up to decades old) waters . The atmospheric trace gases CCl 3 F ( CFC -11), CCl 2 F 2 ( CFC -12), C 2 Cl 3 F 3 ( CFC -113) and SF 6 (sulphur hexafluoride) are increasingly being used as tracers of groundwater residence time (IAEA 2006) . Large-scale production of CFC -12 began in the early 1940s, followed by CFC -11 in
The basis for the CFC dating are the assumptions that the CFC concentration in the recharging water in the unsaturated zone in soil or rock is in equilibrium with the present atmosphere and that the CFCs are conserved in the groundwater (Busenberg and Plummer 1992) . The measured CFC concentrations in water are converted to the corresponding atmospheric CFC concentrations, commonly called apparent atmospheric concentrations, using known solubility relationships .
The concentrations of chlorofluorocarbons ( CFC -11, CFC -12, and CFC -113) and tritium were determined in groundwater in fractured crystalline bedrock at Finnsjön, Sweden . The specific goal was to investigate the accuracy of CFC dating in such an
To delineate the groundwater flow system in a basin, the groundwater age was estimated by analyzing chlorofluorocarbons ( CFC -11, CFC -12 and CFC -113) in a typical headwater wetland in Ichikawa, Japan . Feasibility of groundwater dating by CFCs was assessed comprehensively based on the concentrations of NO3−, SO42−, Fe2+ and dissolved CH4 in the groundwater , because the CFCs would be degraded . . .
DSi as a groundwater dating proxy 13 April 2018 . 4 68 . 69 . Figure 1: Atmospheric time series of CFC concentrations [pptv] The lack of variations since since 1940 . 70 . the 2000s limits their resolution in the last 20 years . Adapted from (Cook and Herczeg, 2000) . 71 One promising family of potential groundwater tracers is natural weathering products
The concentrations of chlorofluorocarbons ( CFC -11, CFC -12, and CFC -113) and tritium were determined in groundwater in fractured crystalline bedrock at Finnsjön, Sweden . The specific goal was to investigate the accuracy of CFC dating in such an environment, taking potential degradation and mixing of water into consideration .
The sensitivity of the CFC dating method depends on the rate of change of the atmospheric CFC concentration with time, and thus the ability to date very young water will diminish with time . However, the ability to date groundwater that entered the saturated zone prior to the Year 2000 will not change for several decades .
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Cfc Groundwater Dating
