A Comparison of methods for the determination of dissolved oxygen in seawater

Culberson, Charles H.; Knapp, George P.; Stalcup, Marvel C.; Williams, Robert T.; Zemlyak, Frank

doi:10.1575/1912/243

Cited by 39 publications

(30 citation statements)

References 3 publications

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“…Oxygen measurements were performed following a standard automated Winkler titration technique with photometric endpoint detection [54] on I06S [39], and amperometric endpoint detection [55] on JC30 and JR239, with a precision less than 0.3 µmol l −1 [40,41].…”

Section: (C) the Antarctic Deep Water Rates Of Export Datasetmentioning

confidence: 99%

Freshwater fluxes in the Weddell Gyre: results from δ ¹⁸ O

Brown

Meredith

Jullion

et al. 2014

Phil. Trans. R. Soc. A.

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Full-depth measurements of δ 18 O from 2008 to 2010 enclosing the Weddell Gyre in the Southern Ocean are used to investigate the regional freshwater budget. Using complementary salinity, nutrients and oxygen data, a four-component mass balance was applied to quantify the relative contributions of meteoric water (precipitation/glacial input), sea-ice melt and saline (oceanic) sources. Combination of freshwater fractions with velocity fields derived from a box inverse analysis enabled the estimation of gyre-scale budgets of both freshwater types, with deep water exports found to dominate the budget. Surface net sea-ice melt and meteoric contributions reach 1.8% and 3.2%, respectively, influenced by the summer sampling period, and −1.7% and +1.7% at depth, indicative of a dominance of sea-ice production over melt and a sizable contribution of shelf waters to deep water mass formation. A net meteoric water export of approximately 37 mSv is determined, commensurate with local estimates of ice sheet outflow and precipitation, and the Weddell Gyre is estimated to be a region of net sea-ice production. These results constitute the first synoptic benchmarking of sea-ice and meteoric exports from the Weddell Gyre, against which future change associated with an accelerating hydrological cycle, ocean climate change and evolving Antarctic glacial mass balance can be determined.

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Section: (C) the Antarctic Deep Water Rates Of Export Datasetmentioning

confidence: 99%

Freshwater fluxes in the Weddell Gyre: results from δ ¹⁸ O

Brown

Meredith

Jullion

et al. 2014

Phil. Trans. R. Soc. A.

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“…Samples were collected for salinity on every bottle and analyzed with an Autosal salinometer using standard techniques [UNESCO, 1981]. Oxygen samples were analyzed with an automated system using a modified Winkler technique [Culberson et al, 1991] [Poisson et al, 1988;. TCO 2 and TA were analyzed on the INDIGO cruises using standard potentiometric titration techniques developed by Edmond [ 1970].…”

Section: Data Qualitymentioning

confidence: 99%

Anthropogenic CO₂ inventory of the Indian Ocean

Sabine¹,

Key²,

Johnson³

et al. 1999

Global Biogeochemical Cycles

216

270

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“…The entire cruise program and sampling strategy is described in Moutin et al (2017). Measurements of the oxygen sensors were calibrated on board using a chemical assay by the Winkler (1888) method modified by Carpenter (1965) and Carritt and Carpenter (1966) and according to the protocol described in Culberson (1991) and Dickson (1996). The determination of the oxygen concentrations was carried out partly according to the photometric method (Williams and 105 Jenkinson, 1982) and partly according to the potentiometric method (Titrino 716 DMS Metrohm®).…”

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confidence: 99%

Excess nitrogen as a marker of intense dinitrogen fixation in the Western Tropical South Pacific Ocean: impact on the thermocline waters of the South Pacific

Fumenia

Moutin

Bonnet

et al. 2018

Preprint

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Abstract. As part of the Oligotrophy to UlTra-oligotrophy PACific Experiment cruise, which took place in the Western 15Tropical South Pacific during the austral summer (March-April 2015), we present data on nitrate, phosphate and on particulate and dissolved organic matter. The stoichiometric nitrogen-to-phosphorus ratios of the inorganic and organic material and the tracer N* are described. N* allows to trace changes in the proportion of fixed nitrogen due to diazotrophy and/or denitrification.Our results showed that the Melanesian archipelago waters between 160° E and 170° W are characterized by a deficit of nitrate and phosphate in the productive layer, significant dinitrogen fixation rates and an excess of particulate organic nitrogen 20 compared to the canonical ratio of Redfield. A positive N* anomaly was observed in the productive layer reflecting the combined effect of phosphate uptake by diazotrophic organisms and remineralization of excess particulate organic nitrogen.The South Pacific Gyre waters between 170° W and 160° W were depleted in nitrate but rich in phosphate. Surface waters exhibited very low dinitrogen fixation rates, an absence of excess particulate organic nitrogen and a N* signal close to zero.The higher iron availability coupled with an absence of nitrate in the suface water of the Melanesian archipelago could 25 stimulate the diazotrophic activity, which in turn will introduce excess nitrogen, deplete the surface waters in phosphate and be the explanation for the positive N* anomaly in the Melanesian archipelago waters. In the thermocline waters, the N* tracer revealed its full complexity, with notably the cumulative effect of the remineralization of particulate organic nitrogen and the

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A Comparison of methods for the determination of dissolved oxygen in seawater

Cited by 39 publications

References 3 publications

Freshwater fluxes in the Weddell Gyre: results from δ ¹⁸ O

Freshwater fluxes in the Weddell Gyre: results from δ ¹⁸ O

Anthropogenic CO₂ inventory of the Indian Ocean

Excess nitrogen as a marker of intense dinitrogen fixation in the Western Tropical South Pacific Ocean: impact on the thermocline waters of the South Pacific

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A Comparison of methods for the determination of dissolved oxygen in seawater

Cited by 39 publications

References 3 publications

Freshwater fluxes in the Weddell Gyre: results from δ 18 O

Freshwater fluxes in the Weddell Gyre: results from δ 18 O

Anthropogenic CO2 inventory of the Indian Ocean

Excess nitrogen as a marker of intense dinitrogen fixation in the Western Tropical South Pacific Ocean: impact on the thermocline waters of the South Pacific

Contact Info

Product

Resources

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Freshwater fluxes in the Weddell Gyre: results from δ ¹⁸ O

Freshwater fluxes in the Weddell Gyre: results from δ ¹⁸ O

Anthropogenic CO₂ inventory of the Indian Ocean