Nutrient (N, P) loads and yields at multiple scales and subbasin types in the Yukon River basin, Alaska
Article first published online: 3 NOV 2007
Copyright 2007 by the American Geophysical Union.
Journal of Geophysical Research: Biogeosciences (2005–2012)
Volume 112, Issue G4, December 2007
How to Cite
2007), Nutrient (N, P) loads and yields at multiple scales and subbasin types in the Yukon River basin, Alaska, J. Geophys. Res., 112, G04S57, doi:10.1029/2006JG000366., and (
- Issue published online: 3 NOV 2007
- Article first published online: 3 NOV 2007
- Manuscript Accepted: 11 MAY 2007
- Manuscript Revised: 3 MAY 2007
- Manuscript Received: 9 NOV 2006
 Loads and yields of dissolved and particulate nitrogen (N) and phosphorus (P) were measured and modeled at three locations on the Yukon River (YR) and on the Tanana and Porcupine Rivers in Alaska during 2001–2005. Total export of N and P upstream of Yukon Delta averaged 120 Gg N a−1 and 56 Gg P a−1, respectively, with 43.5% of total N (TN) as dissolved organic N, and 98% of total P (TP) as particulate phosphorus. Approximately half of the annual export of TN and TP occurred during spring. Hydrologic yields of TN (5.6–13.3 mmol N m−2 a−1) and TP (0.8–9.0 mmol P m−2 a−1) were least in the Porcupine basin and greatest in the Tanana basin and were proportional to water yield. Comparison of current and historical dissolved organic matter (DOM) export from the basin indicates decreased DON export with respect to total water discharge during summer and autumn in recent decades. Any possible climate-related change in annual water discharge will result in proportional changes in N and P export.