The Vertical Flux Method (VFM) for regional estimates of temporally and spatially varying nitrate fluxes in unsaturated zone and groundwater

Christopher T Green1, Lixia Liao2,3, Bernard T Nolan4, Paul F Juckem5, Katherine Ransom3 and Thomas Harter3, (1)USGS, Integrated Modeling Prediction Division, Moffett Field, California, United States, (2)US Geological Survey, Menlo Park, CA, United States, (3)University of California, Davis, CA, United States, (4)US Geological Survey, Reston, VA, United States, (5)US Geological Survey, Madison, United States