Phosphate oxygen isotope ratios as a tracer for sources and cycling of phosphate in North San Francisco Bay, California

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Read Full Article (file size: 876697 bytes) Cited by JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 111, G03003, doi:10.1029/2005JG000079, 2006 Phosphate oxygen isotope ratios as a tracer for sources and cycling of phosphate in North San Francisco Bay, California Karen McLaughlin Department of Geological and Environmental Sciences, Stanford University, Stanford, California, USA Carol Kendall United States Geological Survey, Menlo Park, California, USA Steven R. Silva United States Geological Survey, Menlo Park, California, USA Megan Young Department of Geological and Environmental Sciences, Stanford University, Stanford, California, USA Adina Paytan Department of Geological and Environmental Sciences, Stanford University, Stanford, California, USA Abstract A seasonal analysis assesing variations in the oxygen isotopic composition of dissolved inorganic phosphate (DIP) was conducted in the San Francisco Bay estuarine system, California. Isotopic fractionation of oxygen in DIP (exchange of oxygen between phosphate and environmental water) at surface water temperatures occurs only as a result of enzyme-mediated, biological reactions. Accordingly, if phospate demand is low relative to input and phosphate is not heavily cycled in the ecosystem, the oxygen isotopic composition of DIP (δ¹⁸O_p) will reflect the isotopic composition of the source of phosphate to the system. Such is the case for the North San Francisco Bay, an anthropogenically impacted estuary with high surface water phosphate concentrations. Variability in the δ¹⁸O_p in the bay is primarily controlled by mixing of water masses with different δ¹⁸O_p signatures. The δ¹⁸O_p values range from 11.4‰ at the Sacramento River to 20.1‰ at the Golden Gate. Deviations from the two-component mixing model for the North Bay reflect additional, local sources of phosphate to the estuary that vary seasonally. Most notably, deviations from the mixing model occur at the confluence of a major river into the bay during periods of high river discharge and near wastewater treatment outlets. These data suggest that δ¹⁸O_p can be an effective tool for identifying P point sources and understanding phosphate dynamics in estuarine systems. Received 28 July 2005; accepted 21 April 2006; published 19 July 2006. Keywords: phosphate oxygen isotopes; nutrient source; nutrient cycling; estuary. Index Terms: 0470 Biogeosciences: Nutrients and nutrient cycling (4845, 4850); 4870 Oceanography: Biological and Chemical: Stable isotopes (0454, 1041); 4235 Oceanography: General: Estuarine processes (0442); 0414 Biogeosciences: Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912); 0438 Biogeosciences: Diel, seasonal, and annual cycles (4227). Read Full Article (file size: 876697 bytes) Cited by Citation: McLaughlin, K., C. Kendall, S. R. Silva, M. Young, and A. Paytan (2006), Phosphate oxygen isotope ratios as a tracer for sources and cycling of phosphate in North San Francisco Bay, California, J. Geophys. Res., 111, G03003, doi:10.1029/2005JG000079. Copyright 2006 by the American Geophysical Union.

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