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

McLaughlin, Karen; Kendall, Carol; Silva, Steven R.; Young, M. B.; Paytan, Adina

doi:10.1029/2005jg000079

Cited by 77 publications

(93 citation statements)

References 35 publications

(78 reference statements)

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“…Magnesium hydroxide floc was allowed to settle for 1 h before supernatant was siphoned off, leaving approximately 1-2 liters of floc in seawater. Post cruise, magnesium hydroxide floc was stored in a cold room (4uC) overnight before being processed to silver phosphate according to the method of McLaughlin et al (2004) (Fig. 3).…”

Section: Methodsmentioning

confidence: 99%

A time series investigation of the oxygen isotopic composition of dissolved inorganic phosphate in Monterey Bay, California

et al. 2006

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We present a 2-yr time series of the oxygen isotopic composition of dissolved inorganic phosphate (d 18 O p ) in Monterey Bay, California. d 18 O p can serve as a proxy for phosphate utilization because its approach toward isotopic equilibrium is a function of the degree of biological phosphate cycling. When phosphate is extensively cycled by the biological community in the euphotic zone, the d 18 O p approaches isotopic equilibrium with surrounding water. Our results indicate that d 18 O p in the upper water column is consistently out of isotopic equilibrium with respect to seawater and fluctuates between the equilibrium value and the isotopic signatures of phosphate sources. This suggests that either phosphate is not extensively utilized or that the input of new phosphate to the bay exceeds the requirements of the biological community. d 18 O p is variable and linked to episodic upwelling events and the biotic response to these events. The greatest percent of phosphate oxygen exchange, and thus the greatest phosphate utilization relative to input, occurs at the locus of upwelling (Sta. M1), followed by the offshore (M2) and nearshore (C1) stations, respectively. During the highly productive upwelling season, phosphate turnover is greater than in the winter. Episodes of higher phosphate turnover, as indicated by peaks in d 18 O p , occur simultaneously throughout the upper 200 m of the water column and at all three stations, indicating that these events affect the bay on a large scale. d 18 O p data also suggest that deep water (.500 m) may be a source of phosphate to the euphotic zone in Monterey Bay.

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Section: Methodsmentioning

confidence: 99%

A time series investigation of the oxygen isotopic composition of dissolved inorganic phosphate in Monterey Bay, California

et al. 2006

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“…Regardless of these results, Paytan and co-authors used d 18 O-P to trace P in lacustrine ), estuarine (McLaughlin et al, 2006a, and coastal systems (McLaughlin et al, 2006b). They were able to distinguish between waters of different origin and to recognize the effect of diagenetic processes.…”

Section: Investigation Of Phosphorus Dynamics In Soil-plant Systemsmentioning

confidence: 99%

Oxygen Isotopes for Unraveling Phosphorus Transformations in the Soil-Plant System: A Review

Tamburini

Pfahler

Sperber

et al. 2014

Soil Science Society of America Journal

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“…This opportunity was used for studies of the P cycle in the ocean. [3,4] However, studies on oxygen stable isotopes in soil phosphate are still extremely rare [5][6][7][8] and deal mostly with the total (or HCl-extractable) inorganic fraction.…”

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A method for analyzing the δ¹⁸O of resin‐extractable soil inorganic phosphate

Weiner

Mazeh

Tamburini

et al. 2011

Rapid Comm Mass Spectrometry

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Improved tools for tracing phosphate transformations in soils are much needed, and can lead to a better understanding of the terrestrial phosphorus cycle. The oxygen stable isotopes in soil phosphate are still not exploited in this regard. Here we present a method for measuring the oxygen stable isotopes in a fraction of the soil phosphate which is rapidly available to plants, the resin‐extractable P. This method is based on extracting available phosphate from the soil with anion‐exchange membranes, soil organic matter removal by a resin, purification by precipitation as cerium phosphate, and finally precipitation as silver phosphate. The purified silver phosphate samples are then measured by a high‐temperature elemental analyzer (HT‐EA) coupled in continuous flow mode to an isotope ratio mass spectrometer. Testing the method with Mediterranean and semi‐arid soils showed no artifacts, as well as good reproducibility in the same order as that of the HT‐EA analytical uncertainty (0.3‰). Copyright © 2011 John Wiley & Sons, Ltd.

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

Cited by 77 publications

References 35 publications

A time series investigation of the oxygen isotopic composition of dissolved inorganic phosphate in Monterey Bay, California

A time series investigation of the oxygen isotopic composition of dissolved inorganic phosphate in Monterey Bay, California

Oxygen Isotopes for Unraveling Phosphorus Transformations in the Soil-Plant System: A Review

A method for analyzing the δ¹⁸O of resin‐extractable soil inorganic phosphate

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

Cited by 77 publications

References 35 publications

A time series investigation of the oxygen isotopic composition of dissolved inorganic phosphate in Monterey Bay, California

A time series investigation of the oxygen isotopic composition of dissolved inorganic phosphate in Monterey Bay, California

Oxygen Isotopes for Unraveling Phosphorus Transformations in the Soil-Plant System: A Review

A method for analyzing the δ18O of resin‐extractable soil inorganic phosphate

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A method for analyzing the δ¹⁸O of resin‐extractable soil inorganic phosphate