GEOTRACES intercalibration of neodymium isotopes and rare earth element concentrations in seawater and suspended particles. Part 1: reproducibility of results for the international intercomparison

Flierdt, Tina van de; Pahnke, Katharina; Amakawa, Hiroshi; Andersson, P.; Basak, Chandranath; Coles, Barry J.; Colin, Christophe; Crocket, Kirsty C.; Frank, Martin; Frank, Norbert; Goldstein, Steven L.; Goswami, Vineet; Haley, Brian A.; Hathorne, Ed C; Hemming, S. R.; Henderson, Gideon M.; Jeandel, Catherine; Jones, K. M.; Kreissig, Katharina; Lacan, F.; Lambelet, Myriam; Martin, E. E.; Newkirk, Derrick R; Obata, Haijme; Pena, Leopoldo D.; Piotrowski, Alexander M; Pradoux, Catherine; Scher, Howie D.; Schöberg, Hans; Singh, Sunil Kumar; Stichel, Torben; Tazoe, Hirofumi; Vance, Derek; Yang, Jingjing

doi:10.4319/lom.2012.10.234

Cited by 119 publications

(98 citation statements)

References 42 publications

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“…Comparison of the individual e Nd results from the different stations reveals no systematic offsets among the different filter types and pore sizes. Furthermore, the obtained average Nd isotopic compositions at BATS (20m: e Nd = -9.8 ± 0.56, 2000 m: e Nd = -13.3 ± 0.43) agree well with the average values and precision achieved by the international intercalibration at BATS 15 m (e Nd = -9.2 ± 0.60, 13 labs) and BATS 2000 m (e Nd = -13.1 ± 0.59, 13 labs) (van de Flierdt et al 2012). The additional analysis of an 'unknown' Nd standard by participating labs also resulted in a similar 2s standard deviation of 56 ppm (13 labs, van de Flierdt et al 2012).…”

Section: Filter Testssupporting

confidence: 69%

“…The additional analysis of an 'unknown' Nd standard by participating labs also resulted in a similar 2s standard deviation of 56 ppm (13 labs, van de Flierdt et al 2012). The close similarity between the precision of seawater samples that included extensive sample processing by the individual labs, using different preconcentration and ion chromatography methods, and the 'unknown' Nd standard that did not require any processing, led us to conclude that an inter-laboratory precision of around ± 0.6 e Nd units is the best that can be achieved on samples of 5-15 ng Nd, and that the observed differences are due to analytical uncertainty rather than sample processing or matrix effects (van de Flierdt et al 2012). The precision of our filter tests of ± 0.43-0.56 e Nd units is therefore within the expected analytical uncertainty.…”

Section: Filter Testsmentioning

confidence: 99%

“…For Nd isotope ratios ( 143 Nd/ 144 Nd) and rare earth element (REE) concentrations, goal 1 is addressed in van de Flierdt et al (2012). Goal 2 is addressed here, together with the presentation of seawater profiles of Nd isotope ratios and REE concentrations Most previously published seawater Nd isotopic compositions and Nd concentrations are reported for unfiltered seawater (e.g., Piepgras et al 1979;Piepgras andWasserburg 1980, 1987;Jeandel 1993;Jeandel et al 1998;Amakawa et al 2004;Lacan and Jeandel 2004a, 2004b, 2005Rickli et al 2009).…”

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GEOTRACES intercalibration of neodymium isotopes and rare earth element concentrations in seawater and suspended particles. Part 2: Systematic tests and baseline profiles

Pahnke¹,

Flierdt²,

Jones³

et al. 2012

Limnology & Ocean Methods

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The large-scale collection of seawater samples and analysis of trace elements and isotopes by the GEOTRACES program call for careful comparison and examination of different methods for sample collection, treatment, and processing. Here we report results for different filter types, sampling bottles, and preconcentration methods for Nd from seawater. Neodymium isotope ratios and concentrations of unfiltered and filtered seawater using five different filter types agree within 43-56 ppm (2s standard deviation, SD) and 10% (relative 2s standard deviation), respectively. The filter choice therefore has no effect on the measured parameters at the studied locations in the western North Atlantic. This could well be different, however, in areas of high particle concentrations. We therefore strongly recommend filtration of seawater for Nd isotope and rare earth element concentration measurements. Dissolved Nd ratios and Nd concentrations are reported for the North Atlantic (BATS) and North Pacific (SAFe), and profiles of all rare earth elements are reported for BATS. These baseline profiles are recommended for continued quality control and intercalibration by future GEOTRACES cruises. AcknowledgmentsWe thank Bob Anderson, Marty Fleisher, and Tim Kenna (LDEO) for the excellent team work before, during, and after the cruises. Special thanks to Greg Cutter, Ken Bruland, and Rob Sherrell for leading the intercalibration effort. We thank the science party of both intercalibration cruises and captain and crew of the R/V Knorr. E. Sholkovitz, G. Bayon, associate Editor P. Croot, and one anonymous reviewer are greatly acknowledged for their constructive reviews. Most previously published seawater Nd isotopic compositions and Nd concentrations are reported for unfiltered seawater (e.g., Piepgras et al. 1979;Piepgras and Wasserburg 1980, 1987;Jeandel 1993; Jeandel et al. 1998;Amakawa et al. 2004;Lacan and Jeandel 2004a, 2004b, 2005Rickli et al. 2009). Alibo and Nozaki (1999) Nd ratios and Nd concentrations at SAFe. The results obtained on filtered seawater are compared with previously published results, hydrography at the stations, and particle compositions. We recommend the use of these profiles as 'baseline profiles' for reoccupation and continuous intercalibration in the future, in particular of the deeper samples for which a stronger temporal stability can be expected. Materials and procedures Sample locationsSamples for this study were collected during two GEOT-RACES intercalibration cruises on R/V Knorr. During cruise KN193-6 (Bermuda-Norfolk, June-July 2008), we collected seawater samples at the Bermuda Atlantic Time-Series Study station (BATS, 31°40¢ N, 64°10¢ W) from 20 m and 2000 m water depth and a full water column profile, as well as seawater from a station on the Virginia continental slope (Virginia slope station, 37°2¢ N, 74°24¢ W) from 36 m water depth (Fig. 1a). During cruise KN195-8 (Honolulu-San Diego, May 2009), we collected a seawater profile at the North Pacific Sampling and Analysis of Iron station ...

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Section: Filter Testssupporting

confidence: 69%

Section: Filter Testsmentioning

confidence: 99%

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GEOTRACES intercalibration of neodymium isotopes and rare earth element concentrations in seawater and suspended particles. Part 2: Systematic tests and baseline profiles

Pahnke¹,

Flierdt²,

Jones³

et al. 2012

Limnology & Ocean Methods

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“…The external reproducibility (2σ), determined by repeated processing and analysis of seawater samples from BATS (Bermuda Atlantic Times Series station) from 20 m and 2000 m water depth, was b10% for all REEs except for Ce (b 18%; n = 5). Our analyses were within the 8% range of the consensus values of the BATS samples Van de Flierdt et al, 2012). Procedural blanks were b 4% for all REEs except for the lowest measured Ce concentration (b10%).…”

Section: 44mentioning

confidence: 71%

The drivers of biogeochemistry in beach ecosystems: A cross-shore transect from the dunes to the low-water line

et al. 2017

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This study addresses key processes in high-energy beach systems using an interdisciplinary approach. We assess spatial variations in subsurface pore water residence times, salinity, organic matter (OM) availability, and redox conditions and their effects on nutrient cycles as well as on microbial community patterns and microphytobenthos growth. At the study site on Spiekeroog Island, southern North Sea, beach hydrology is characterized by the classical zonation with an upper saline plume (USP), a saltwater wedge, and a freshwater discharge tube in between. Sediment and pore water samples were taken along a cross-shore transect from the dunes to the low-water line reaching sediment depths down to 5 m below sediment surface. Spatial variations in pore water residence time, salinity, and organic matter availability lead to steep redox and nutrient gradients. Vertical and horizontal differences in the microbial community indicate the influence of these gradients and salinity on the community structure. shoreline. We propose that this nutrient efflux triggers growth of microphytobenthos on sediment surfaces of the discharge zone. A first comparison of nutrient discharge rates of the beach site with a nearby sandy backbarrier tidal flat margin indicates that the beach system might be of less importance in supplying recycled nutrients to nearshore waters than the backbarrier tidal flat area.

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“…that mixes into LCDW, it is plausible that the western basin receives AABW with a less radiogenic ε Nd signature mixed into LCDW from the Weddell Sea and Adélie Coast van de Flierdt et al, 2006). A slight negative shift towards ε Nd = −9 is also observed at the depth of the salinity maximum of LCDW at all western transect stations south of the SAF (PS75/095, PS75/089, PS75/088) and also at the eastern transect stations south of the SAF (Fig.…”

Section: Western Transectmentioning

confidence: 99%

Neodymium isotopic characterization of Ross Sea Bottom Water and its advection through the southern South Pacific

Basak

Pahnke

Gersonde

2015

Earth and Planetary Science Letters

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GEOTRACES intercalibration of neodymium isotopes and rare earth element concentrations in seawater and suspended particles. Part 1: reproducibility of results for the international intercomparison

Cited by 119 publications

References 42 publications

GEOTRACES intercalibration of neodymium isotopes and rare earth element concentrations in seawater and suspended particles. Part 2: Systematic tests and baseline profiles

GEOTRACES intercalibration of neodymium isotopes and rare earth element concentrations in seawater and suspended particles. Part 2: Systematic tests and baseline profiles

The drivers of biogeochemistry in beach ecosystems: A cross-shore transect from the dunes to the low-water line

Neodymium isotopic characterization of Ross Sea Bottom Water and its advection through the southern South Pacific

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