Artemis, the New 14C AMS at LMC14 in Saclay, France

Cottereau, E.; Arnold, Maurice; Moreau, C.; Baqué, David; Bavay, D.; Caffy, Ingrid; Comby, Clothilde; Dumoulin, J-P; Hain, S; Perron, Marion; Salomon, J.; Setti, V

doi:10.1017/s0033822200042211

Cited by 84 publications

(64 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Samples were converted to CO 2 in a semi-automated carbonate vacuum line (Tisnérat-Laborde et al, 2001), reduced to graphite using hydrogen in the presence of iron powder (Arnold et al 1989), and measured by the AMS-LMC14 (Laboratoire de Mesure du Carbon 14) Artemis accelerator facility (Cottereau et al, 2007). They are expressed as pMC normalised to a δ 13 C of −25 ‰ relative to the Vienna Pee Dee Belemnite (PDB) international standard according to Stuiver and Polach (1977).…”

Section: Methodsmentioning

confidence: 99%

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

et al. 2012

View full text Add to dashboard Cite

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.

show abstract

Section: Methodsmentioning

confidence: 99%

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

et al. 2012

View full text Add to dashboard Cite

show abstract

“…Subsequent steps are similar in both laboratories: CO 2 evolving, water elimination, and evaluation of C quantity. CO 2 reduction and 14 C activity measurements are performed in Saclay (67,68) and Poznan (69,70) according to their respective protocols and equipment.…”

Section: (Si Text)mentioning

confidence: 99%

The impact of Last Glacial climate variability in west-European loess revealed by radiocarbon dating of fossil earthworm granules

Moine

Antoine

Hatté

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

106

103

View full text Add to dashboard Cite

The characterization of Last Glacial millennial-timescale warming phases, known as interstadials or Dansgaard-Oeschger events, requires precise chronologies for the study of paleoclimate records. On the European continent, such chronologies are only available for several Last Glacial pollen and rare speleothem archives principally located in the Mediterranean domain. Farther north, in continental lowlands, numerous high-resolution records of loess and paleosols sequences show a consistent environmental response to stadial-interstadial cycles. However, the limited precision and accuracy of luminescence dating methods commonly used in loess deposits preclude exact correlations of paleosol horizons with Greenland interstadials. To overcome this problem, a radiocarbon dating protocol has been developed to date earthworm calcite granules from the reference loess sequence of Nussloch (Germany). Its application yields a consistent radiocarbon chronology of all soil horizons formed between 47 and 20 ka and unambiguously shows the correlation of every Greenland interstadial identified in isotope records with specific soil horizons. Furthermore, eight additional minor soil horizons dated between 27.5 and 21 ka only correlate with minor decreases in Greenland dust records. This dating strategy reveals the high sensitivity of loess paleoenvironments to Northern Hemisphere climate changes. A connection between loess sedimentation rate, Fennoscandian ice sheet dynamics, and sea level changes is proposed. The chronological improvements enabled by the radiocarbon "earthworm clock" thus strongly enhance our understanding of loess records to a better perception of the impact of Last Glacial climate changes on European paleoenvironments

show abstract

“…Finally, the CO 2 was reduced into graphite using hydrogen in the presence of iron powder according to the procedure developed by Arnold et al (1989). The graphite targets were analyzed at the AMS-Artemis facility (Cottereau et al 2007). 14 C results are reported as  14 C, the deviation of a sample's 14 C/ 12 C ratio from that of a pre-industrial wood standard, expressed in per mil (‰) according to the convention of Stuiver and Polach (1977), normalized to a  13 C of -25.0‰ relative to the Pee Dee Belemnite (PDB) international standard, and corrected by the age of the sample and background subtraction.…”

Section: Analytical Proceduresmentioning

confidence: 99%

A High-Resolution Coral-Based Δ14C Record of Surface Water Processes in the Western Mediterranean Sea

Tisnérat‐Laborde

Montagna

McCulloch³

et al. 2013

azu_js_rc

View full text Add to dashboard Cite

ABSTRACT. The first high-resolution time series of pre-and post-bomb radiocarbon measurements is reported for surface waters in the western Mediterranean Sea. The  14 C record was obtained from the aragonite skeleton of Cladocora caespitosa using a 50-yr-old corallite collected in the Ligurian Sea in 1998. Laser-ablation ICP measurements of trace elements (Li/Mg and Sr/Ca) show a strong seasonal variability, enabling the chronology of the  14 C record to be determined at annual timescales. The mean  14 C of pre-bomb surface water is -56 ± 3‰, corresponding to a reservoir age of 262 ± 29 yr. The postbomb maximum occurs in 1972 with a  14 C value of 90‰, significantly lower than the peak of 150‰ observed in the North Atlantic. The dilution of the peak-amplitude of  14 C in western Mediterranean surface waters is attributed to mixing of North Atlantic Central Water inflow with relatively depleted underlying Intermediate Mediterranean and Levantine Intermediate waters. Intensification of this mixing is observed in 1963-1964, consistent with the change in atmospheric circulation from a positive to negative NAO phase (1960)(1961)(1962)(1963)(1964)(1965)(1966)(1967). The post-peak  14 C variability is relatively limited, reflecting mainly local vertical mixing forced by wind stress.

show abstract

Artemis, the New ¹⁴C AMS at LMC14 in Saclay, France

Cited by 84 publications

References 5 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

The impact of Last Glacial climate variability in west-European loess revealed by radiocarbon dating of fossil earthworm granules

A High-Resolution Coral-Based Δ14C Record of Surface Water Processes in the Western Mediterranean Sea

Contact Info

Product

Resources

About

Artemis, the New 14C AMS at LMC14 in Saclay, France

Cited by 84 publications

References 5 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

The impact of Last Glacial climate variability in west-European loess revealed by radiocarbon dating of fossil earthworm granules

A High-Resolution Coral-Based Δ14C Record of Surface Water Processes in the Western Mediterranean Sea

Contact Info

Product

Resources

About

Artemis, the New ¹⁴C AMS at LMC14 in Saclay, France

<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