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JOURNAL OF GEOPHYSICAL RESEARCH,
VOL. 112,
G04S57,
doi:10.1029/2006JG000366,
2007
Nutrient (N, P) loads and yields at multiple scales and subbasin types in the Yukon River basin, Alaska
Mark M. Dornblaser
U.S. Geological Survey, Boulder, Colorado, USA
Robert G. Striegl
U.S. Geological Survey, Denver, Colorado, USA
Abstract
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.
Received 9
November
2006;
accepted 11
May
2007;
published 3
November
2007.
Keywords: Yukon;
nitrogen;
phosphorus;
river.
Index Terms: 0470 Biogeosciences: Nutrients and nutrient cycling (4845, 4850); 0744 Cryosphere: Rivers (0483, 1856); 0414 Biogeosciences: Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912); 1637 Global Change: Regional climate change; 9315 Geographic Location: Arctic region (0718, 4207).
Read Full Article (file size: 493863 bytes) Cited by
Citation: Dornblaser, M. M., and R. G. Striegl
(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.
This paper is not subject to U.S. copyright. Published in 2007 by the
American Geophysical Union.
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