Insights into the base of the critical zone from geophysical logging and groundwater flow testing at U.S. Critical Zone Observatories (CZO) and critical zone study sites (CZs)

Bradley Carr, University of Wyoming, Department of Geology & Geophysics, Laramie, WY, United States, Ye Zhang, Univ of Wyoming, Geology and Geophysics, Laramie, WY, United States, Shuangpo Ren, University of Wyoming, Department of Geology and Geophysics, Laramie, WY, United States, Brady Flinchum, University of Newcastle, School of Environmental and Life Sciences, Callaghan, Australia, Andy Parsekian, University of Wyoming, Geology, Laramie, WY, United States, Steve Holbrook, Virginia Tech, Department of Geosciences, Blacksburg, United States, Clifford S Riebe, University of Wyoming, Laramie, United States, Bryan G Moravec, University of Arizona, Environmental Science, Tucson, AZ, United States, Jon Chorover, University of Arizona, Department of Environmental Science, Tucson, United States, Jon D Pelletier, University of Arizona, Geosciences, Tucson, AZ, United States and Daniel deB. Richter Jr, Nicholas School of the Environment, Duke University, Durham, United States