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Scientific Investigations Report 2010–5229


Estimates of Tracer-Based Piston-Flow Ages of Groundwater from Selected Sites: National Water-Quality Assessment Program, 1992–2005


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Figure 3. Comparison of nitrogen/argon (N2/Ar)-inferred recharge temperatures and climate-based recharge temperatures (mean annual air temperature + 1°C) for groundwater sites that were in aquifers composed of sediments and were interpreted in this report. Study-Unit abbreviations are defined in table A1 (appendix A). N2/Ar-inferred recharge temperatures and climate-based recharge temperatures are listed for individual sites in appendix G.

First posted January 27, 2011

For additional information contact:
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U.S. Geological Survey
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http://or.water.usgs.gov

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