Seasonal nutrient sources, yields, stream concentrations, and their twenty-year trends quantified across the conterminous U.S.
Noah M Schmadel, U.S. Geological Survey, Earth System Processes Division, Portland, United States, Olivia Miller, U.S. Geological Survey, Utah Water Science Center, Salt Lake City, United States, Scott Ator, U.S. Geological Survey, MD-DE-DC Water Science Center, Baltimore, United States, Matthew P Miller, U.S. Geological Survey, Integrated Modeling and Prediction Division, Boulder, United States, Gregory E. Schwarz, U.S. Geological Survey, Reston, VA, United States, Dale M Robertson, USGS Upper Midwest Water Science Center, Middleton, WI, United States, Andrew Sekellick, USGS Maryland/Delaware/District of Columbia Water Science Center, Baltimore, MD, United States and David A Saad, USGS Upper Midwest Water Science Center, Middleton, United States