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 A Flinchum, University of Wyoming, Geology and Geophysics, Laramie, WY, United States, Andrew Parsekian, University of Wyoming, Geology, Laramie, WY, United States, W Steven Holbrook, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States, Clifford S Riebe, University of Wyoming, Laramie, WY, United States, Bryan G Moravec, University of Arizona, Soil, Water and Environmental Science, Tucson, AZ, United States, Jon Chorover, University of Arizona, Department of Soil, Water and Environmental Science, Tucson, AZ, United States, Jon D Pelletier, Geosciences, Tucson, AZ, United States and Daniel deB. Richter Jr, Duke University, Nicholas School of the Environment, Durham, NC, United States