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This project makes use of three new analytical techniques to help understand the ways in which N is lost from rivers in north Florida. In particular, we have coupled the use of isotopes of N and O in nitrate (to measure source and process), high resolution nitrate sensors (to measure the diel patterns of nitrate concentration changes), and membrane-inlet mass spectrometry (to measure N2 gas in water compared with concentrations of Ar from which area rates of denitrification can be inferred). We are also developing the first comprehensive analysis of the hydraulics of karst spring-fed rivers in Florida, which has important implications for surface-groundwater mixing and consequently for the fate of N and other contaminants. We are doing these measurements in 8 major spring fed rivers from throughout the state. |
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Final Report |
Journal Articles |
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Title: | Annual Report Year 1: Mechanisms of Nitrogen Loss in Florida’s Spring Fed Rivers |
Authors: | Cohen MJ, Liebowitz D, Heffernan JB, Korhnak L, Hensley R |
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