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Sources and Transformations of Nitrogen Compounds along the Lower Jordan River

^a Faculty of Civil and Environmental Engineering, Technion, Israel Institute of Technology, Haifa, Israel
^b Department of Geological and Environmental Sciences, Ben Gurion University, Beer Sheva, Israel
^c Geological Survey of Israel, Jerusalem, Israel
^d Departments of Physics & Astronomy and Geology & Geophysics, University of Calgary, Calgary, AB, Canada T2N 1N4

View larger version (34K): [in a new window]   Fig. 1. A map of the study area between the Sea of Galilee and Shifa. Sampling and measurement sites include sites along the river, tributaries, drainages, fishponds, and soil samples. Agricultural drainages are marked as straight lines. Segment N1 is Dalhamiya (Site 6) to Gesher (Site 8), N2 is Gesher (Site 8) to Nave Ur (Site 11), and N3 is Nave Ur (Site 16) to Hamadiya (Site 19). For site information see Table 1.

View larger version (28K): [in a new window]   Fig. 2. Ammonium (a), nitrate (b), and nitrite (c) concentrations in the river water versus aerial distance from Alumot dam (Table 1). River segments are drawn schematically along the flow (N1, N2, and N3). Site numbers are shown at the top.

View larger version (37K): [in a new window]   Fig. 3. Values of 15N (NO3), 15N (NH4), and 18O (NO3) along the river as a function of time and distance from Alumot dam.

View larger version (27K): [in a new window]   Fig. 4. The 15N (NO3) values in the Jordan River, the Yarmouk River, and other inflows versus nitrate concentrations. Data are based on all sampling dates.