Nd isotopes in deep-sea corals in the North-eastern Atlantic

Copard, K.; Colin, Christophe; Douville, Éric; Freiwald, André; Guðmundsson, Gestur; Mol, Ben De; Frank, Norbert

doi:10.1016/j.quascirev.2010.05.025

Cited by 71 publications

(75 citation statements)

References 54 publications

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“…Uncertainties for 210 Pb analyses are given as 1σ uncertainty of counting statistics of samples and blanks. Mn concentrations of corals were analysed on cleaned and dissolved coral fragments using a quadruple ICP-MS (Inductively Coupled Plasma Mass Spectrometry) Xseries II(Thermo) following the bracketing protocol described by Copard et al (2010). Samples and standard solutions were systematically adjusted to 100 ppm Ca through dilution.…”

Section: Methodsmentioning

confidence: 99%

“…The aragonitic skeletons of cold water scleractinian corals are being used as archives to trace past climate and ocean circulation patterns (Adkins et al, 1998;Magini et al, 1998;Heikoop et al, 2002;Thresher et al, 2004;Frank et al, 2005;van de Flierdt et al, 2006;Colin et al, 2010;Copard et al, 2010). The skeletons are usually dated using 230 Th/U and 14 C (Adkins et al, 1998;Mangini et al, 1998;Cheng et al, 2000;Frank et al, 2004Frank et al, , 2009) and the aragonite can incorporate numerous tracers of water-mass provenance, state of ventilation and surface ocean productivity.…”

Section: P Sabatier Et Al: Rapid Growth Rate Of Madrepora Oculata Amentioning

confidence: 99%

“…Their complex branching and anastomizing complex colonies have proved difficult for sclerochronology (Risk et al, 2005). However, the occurrence of these species is strongly influenced by climate (Rüggeberg et al, 2008;Frank et al, 2009Frank et al, , 2011 and their skeletons can be used to reconstruct water mass provenance Copard et al, 2010Copard et al, , 2011. For both species, independent growth rate estimates have been obtained from in situ observations and aquarium studies.…”

Section: P Sabatier Et Al: Rapid Growth Rate Of Madrepora Oculata Amentioning

confidence: 99%

“…Adkins et al (2004) showed that this surface contamination had to be removed prior to U-series dating. In our study, coral skeletons were subsampled by cutting and then cleaned following the procedure described by Copard et al (2010). Corals polyps were cut in half and rinsed in MilliQ water to remove sediments from the external and internal surface.…”

Section: Coral Samples and Cleaningmentioning

confidence: 99%

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210Pb-226Ra chronology reveals rapid growth rate of Madrepora oculata and Lophelia pertusa on world's largest cold-water coral reef

et al. 2012

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Abstract.Here we show the use of the 210 Ra excess method to determine the growth rate of two corals from the world's largest known cold-water coral reef, Røst Reef, north of the Arctic circle off Norway. Colonies of each of the two species that build the reef, Lophelia pertusa and Madrepora oculata, were collected alive at 350 m depth using a submersible. Pb and Ra isotopes were measured along the major growth axis of both specimens using low level alpha and gamma spectrometry and trace element compositions were studied. 210 Pb and 226 Ra differ in the way they are incorporated into coral skeletons. Hence, to assess growth rates, we considered the exponential decrease of initially incorporated 210 Pb, as well as the increase in 210 Pb from the decay of 226 Ra and contamination with 210 Pb associated with MnFe coatings that we were unable to remove completely from the oldest parts of the skeletons.226 Ra activity was similar in both coral species, so, assuming constant uptake of 210 Pb through time, we used the 210 Pb-226 Ra chronology to calculate growth rates. The 45.5 cm long branch of M. oculata was 31 yr with an average linear growth rate of 14.4 ± 1.1 mm yr −1 (2.6 polyps per year). Despite cleaning, a correction for Mn-Fe oxide contamination was required for the oldest part of the colony; this correction corroborated our radiocarbon date of 40 yr and a mean growth rate of 2 polyps yr −1 . This rate is similar to the one obtained in aquarium experiments under optimal growth conditions.For the 80 cm-long L. pertusa colony, metal-oxide contamination remained in both the middle and basal part of the coral skeleton despite cleaning, inhibiting similar age and growth rate estimates. The youngest part of the colony was free of metal oxides and this 15 cm section had an estimated a growth rate of 8 mm yr −1 , with high uncertainty (∼1 polyp every two to three years). We are less certain of this 210 Pb growth rate estimate which is within the lowermost ranges of previous growth rate estimates.We show that 210 Pb-226 Ra dating can be successfully applied to determine the age and growth rate of frameworkforming cold-water corals if Mn-Fe oxide deposits can be removed. Where metal oxides can be removed, large M. oculata and L. pertusa skeletons provide archives for studies of intermediate water masses with an up to annual time resolution and spanning over many decades.

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Section: Methodsmentioning

confidence: 99%

Section: P Sabatier Et Al: Rapid Growth Rate Of Madrepora Oculata Amentioning

confidence: 99%

Section: P Sabatier Et Al: Rapid Growth Rate Of Madrepora Oculata Amentioning

confidence: 99%

Section: Coral Samples and Cleaningmentioning

confidence: 99%

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210Pb-226Ra chronology reveals rapid growth rate of Madrepora oculata and Lophelia pertusa on world's largest cold-water coral reef

et al. 2012

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“…Adkins et al, 1998;Frank et al, 2004) and ocean circulation (e.g. Colin et al, 2010;Copard et al, 2010Copard et al, , 2012. Similarly, sediment sequences from piston and gravity cores through sub-recent mound units have been analysed to infer late Quaternary palaeo-environmental conditions along the NW European continental margin (e.g.…”

Section: Introductionmentioning

confidence: 99%

Cold-water coral carbonate mounds as unique palaeo-archives: the Plio-Pleistocene Challenger Mound record (NE Atlantic)

Thierens

Browning

Pirlet

et al. 2013

Quaternary Science Reviews

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Dynamic intermediate ocean circulation in the North Atlantic during Heinrich Stadial 1: A radiocarbon and neodymium isotope perspective

et al. 2014

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The last deglaciation was characterized by a series of millennial-scale climate events that have been linked to deep ocean variability. While often implied in interpretations, few direct constraints exist on circulation changes at mid-depths. Here we provide new constraints on the variability of deglacial mid-depth circulation using combined radiocarbon and neodymium isotopes in 24 North Atlantic deep-sea corals. Their aragonite skeletons have been dated by uranium-series, providing absolute ages and the resolution to record centennial-scale changes, while transects spanning the lifetime of a single coral allow subcentennial tracer reconstruction. Our results reveal that rapid fluctuations of water mass sourcing and radiocarbon affected the mid-depth water column (1.7-2.5 km) on timescales of less than 100 years during the latter half of Heinrich Stadial 1. The neodymium isotopic variability (À14.5 to À11.0) ranges from the composition of the modern northern-sourced waters towards more radiogenic compositions, suggesting the presence of a greater southern-sourced component at some times. However, in detail, simple two-component mixing between well-ventilated northern-sourced and radiocarbon-depleted southern-sourced water masses cannot explain all our data. Instead, corals from~15.0 ka and~15.8 ka may record variability between southern-sourced intermediate waters and radiocarbon-depleted northern-sourced waters, unless there was a major shift in the neodymium isotopic composition of the northern end-member. In order to explain the rapid shift towards the most depleted radiocarbon values at~15.4 ka, we suggest a different mixing scenario involving either radiocarbon-depleted deep water from the Greenland-Iceland-Norwegian Seas or a southern-sourced deep water mass. Since these mid-depth changes preceded the Bolling-Allerod warming and were apparently unaccompanied by changes in the deep Atlantic, they may indicate an important role for the intermediate ocean in the early deglacial climate evolution.

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Nd isotopes in deep-sea corals in the North-eastern Atlantic

Cited by 71 publications

References 54 publications

<sup>210</sup>Pb-<sup>226</sup>Ra chronology reveals rapid growth rate of <i>Madrepora oculata</i> and <i>Lophelia pertusa</i> on world's largest cold-water coral reef

<sup>210</sup>Pb-<sup>226</sup>Ra chronology reveals rapid growth rate of <i>Madrepora oculata</i> and <i>Lophelia pertusa</i> on world's largest cold-water coral reef

Cold-water coral carbonate mounds as unique palaeo-archives: the Plio-Pleistocene Challenger Mound record (NE Atlantic)

Dynamic intermediate ocean circulation in the North Atlantic during Heinrich Stadial 1: A radiocarbon and neodymium isotope perspective

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Nd isotopes in deep-sea corals in the North-eastern Atlantic

Cited by 71 publications

References 54 publications

&lt;sup&gt;210&lt;/sup&gt;Pb-&lt;sup&gt;226&lt;/sup&gt;Ra chronology reveals rapid growth rate of &lt;i&gt;Madrepora oculata&lt;/i&gt; and &lt;i&gt;Lophelia pertusa&lt;/i&gt; on world's largest cold-water coral reef

&lt;sup&gt;210&lt;/sup&gt;Pb-&lt;sup&gt;226&lt;/sup&gt;Ra chronology reveals rapid growth rate of &lt;i&gt;Madrepora oculata&lt;/i&gt; and &lt;i&gt;Lophelia pertusa&lt;/i&gt; on world's largest cold-water coral reef

Cold-water coral carbonate mounds as unique palaeo-archives: the Plio-Pleistocene Challenger Mound record (NE Atlantic)

Dynamic intermediate ocean circulation in the North Atlantic during Heinrich Stadial 1: A radiocarbon and neodymium isotope perspective

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<sup>210</sup>Pb-<sup>226</sup>Ra chronology reveals rapid growth rate of <i>Madrepora oculata</i> and <i>Lophelia pertusa</i> on world's largest cold-water coral reef

<sup>210</sup>Pb-<sup>226</sup>Ra chronology reveals rapid growth rate of <i>Madrepora oculata</i> and <i>Lophelia pertusa</i> on world's largest cold-water coral reef