Modulation of the Southern Ocean cadmium isotope signature by ocean circulation and primary productivity

Abouchami, W.; Galer, S. J. G.; Baar, de Henricus; Alderkamp, Anne‐Carlijn; Middag, Rob; Laan, Patrick; Feldmann, Hendrik; Andreae, Meinrat O.

doi:10.1016/j.epsl.2011.02.044

Cited by 133 publications

(134 citation statements)

References 49 publications

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“…Therefore, it is possible that the low Mn concentration at this station is associated with a significant increase in V max and correspondingly higher than calculated Cd uptake rates. Our approach using Cd* also supports the interpretation of a difference in Cd isotope fractionation factors reported by Abouchami et al (2011) towards a change from a lower affinity Mn uptake system in the AAZ where Mn and Cd* are high, to a higher affinity uptake system in the Weddell Gyre where Mn and Cd* are low. Changes in Mn uptake system affinities can therefore also represent a plausible explanation for the correlation between Cd* and Mn along the Zero Meridian.…”

Section: Discussionsupporting

confidence: 65%

“…3). Moreover, the near-surface Cd concentration at B1 has been determined by Abouchami et al (2011;10 m, Cd 5 36 pmol L 21 ). Because P concentrations at B1 decrease from the surface to a depth of 75 m, and because Cd concentrations covary with P, the range of near-surface Cd concentrations at B1 can be expected to be in good agreement with the measured values at A4 in this depth range (4-42 pmol L 21 ).…”

Section: Resultsmentioning

confidence: 99%

“…Sample preparation for isotope dilution-thermal ionization mass spectrometry (ID-TIMS) measurements of dissolved Cd involved further acidification to pH 5 1 (HCl, Baseline Seastar TM ) and subsequent Cd extraction on an ion exchange column following established protocols (Schmitt et al 2009;Abouchami et al 2011). This method, initially developed for simultaneous determination of Cd concentration and Cd isotope composition in seawater, was slightly modified to allow faster processing of smaller volumes (10 mL) for concentration data only.…”

Section: Methodsmentioning

confidence: 99%

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Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate

Baars¹,

Abouchami²,

Galer³

et al. 2014

Limnology & Oceanography

109

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We report isotope dilution analyses of dissolved cadmium (Cd) and electrochemical Cd speciation measurements in the Atlantic sector of the Southern Ocean. Bioavailable inorganic Cd is . 100 times higher in nearsurface waters south of the Polar Front compared to the Subantarctic Zone because of upwelling and reduced complexation by organic Cd ligands. To trace local changes in the relation between Cd and P, we examine the deviations from a linear deep-water Cd vs. P relation (Cd*), and find that changes in Cd* coincide with the position of frontal systems and covary with primary productivity and total dissolved Mn and Fe concentrations. These covariations agree with potential local changes in phytoplankton Cd uptake rates, resulting from differences in the availability of Cd, Zn, Mn, and Fe. A band of negative Cd* values is associated with formation of Subantarctic Mode Water (SAMW) and Antarctic Intermediate Water (AAIW). In contrast to SAMW, which may export low Cd : P ratios from the Southern Ocean, the Cd : P ratios in AAIW increase by mixing with underlying Upper Circumpolar Deep Water before being exported from the Southern Ocean. Deep waters show constant Cd : P ratios, and both elements behave conservatively with end-member mixing between deep waters of the Weddell Gyre, the Antarctic Circumpolar Current, and inflowing North Atlantic Deep Water. Overall, our results support the hypothesis that the kink in the global Cd vs. P relation is largely caused by high Cd : P uptake ratios in the trace-nutrient-limited Southern Ocean.

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Section: Discussionsupporting

confidence: 65%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate

Baars¹,

Abouchami²,

Galer³

et al. 2014

Limnology & Oceanography

109

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“…Note that the data presented here were obtained following chromatographic clean-up of the respective spikes. Thereafter, a new separation method was developed for Cd alone-described in detail in Abouchami et al (2011)-and processed four additional GDI samples using the latter technique. Briefly, chemical separation and purification of the cadmium fraction of approximately 1-L seawater samples is performed in two steps.…”

Section: Imperial College Cadmium Isotope Methodsmentioning

confidence: 99%

GEOTRACES IC1 (BATS) contamination‐prone trace element isotopes Cd, Fe, Pb, Zn, Cu, and Mo intercalibration

Boyle

John

Abouchami

et al. 2012

Limnology & Ocean Methods

107

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The stable isotope composition of radiogenic and natural elements provides a powerful tool for unraveling element sources and biogeochemical processes in the marine environment. Depending on the element, trace element isotope ratios can (1) narrow possible sources of the element in a sample and/or (given a temporal history boundary condition) constrain the time the when the element departed the ocean surface (e.g., Pb, Nd), (2) provide information on redox processes that the element is directly or indirectly involved in (e.g., Fe, Mo, Tl), (3) indicate the extent of biological uptake and/or ocean mixing of the element (e.g., Cd, Zn).However, these trace metals occur at picomolar to nanomolar concentrations, and precise stable isotope measurements require 100-1000 times more sample than required for concentration determination. AbstractWe report data on the isotopic composition of cadmium, copper, iron, lead, zinc, and molybdenum at the GEOTRACES IC1 BATS Atlantic intercalibration station. In general, the between lab and within-lab precisions are adequate to resolve global gradients and vertical gradients at this station for Cd, Fe, Pb, and Zn. Cd and Zn isotopes show clear variations in the upper water column and more subtle variations in the deep water; these variations are attributable, in part, to progressive mass fractionation of isotopes by Rayleigh distillation from biogenic uptake and/or adsorption. Fe isotope variability is attributed to heavier crustal dust and hydrothermal sources and light Fe from reducing sediments. Pb isotope variability results from temporal changes in anthropogenic source isotopic compositions and the relative contributions of U.S. and European Pb sources. Cu and Mo isotope variability is more subtle and close to analytical precision. Although the present situation is adequate for proceeding with GEOTRACES, it should be possible to improve the within-lab and between-lab precisions for some of these properties.

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“…This complete system has been used successfully during several cruises in the Arctic, Antarctic and Northeast Atlantic Ocean with a total of 113 full depth casts. The system proved clean to sample for dissolved Fe , the organic complexation of Fe (Thuróczy et al, 2011), dissolved Al (Middag et al, 2009), dissolved Mn , dissolved Zn , the organic speciation of Zn , dissolved Cd (Baars et al, 2014) and the stable isotopes composition of dissolved Cd (Abouchami et al, 2011;Abouchami et al, 2014;Xue et al, 2013) and Zn .…”

mentioning

confidence: 99%

“PRISTINE”, a new high volume sampler for ultraclean sampling of trace metals and isotopes

et al. 2015

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The NIOZ Repository gives free access to the digital collection of the work of the Royal Netherlands Institute for Sea Research. This archive is managed according to the principles of the Open Access Movement, and the Open Archive Initiative. Each publication should be cited to its original source -please use the reference as presented. When using parts of, or whole publications in your own work, permission from the author(s) or copyright holder(s) is always needed. and closed using a butterfly-valve closing mechanism. The samplers are mounted on an alltitanium frame and deployed using a poly-aramide hydrowire (Super Aram) with internal power/signal conductors. Upon recovery the complete frame is immediately placed in its own clean-air laboratory unit. Samplers are (i) always closed when onboard, (ii) always mounted on the frame without the need for hand-carrying heavy samplers, and (iii) can be deployed again with minimal (manual) preparation. The PRISTINE ultraclean sampling system was used for the first time during the GA02 GEOTRACES cruises in the West Atlantic Ocean

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Modulation of the Southern Ocean cadmium isotope signature by ocean circulation and primary productivity

Cited by 133 publications

References 49 publications

Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate

Dissolved cadmium in the Southern Ocean: Distribution, speciation, and relation to phosphate

GEOTRACES IC1 (BATS) contamination‐prone trace element isotopes Cd, Fe, Pb, Zn, Cu, and Mo intercalibration

“PRISTINE”, a new high volume sampler for ultraclean sampling of trace metals and isotopes

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