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