NIST RM 8301 Boron Isotopes in Marine Carbonate (Simulated Coral and Foraminifera Solutions): Inter‐laboratory δ11B and Trace Element Ratio Value Assignment
Year: 2020
Type: article
Abstract: The boron isotopic ratio of 11B/10B (δ11BSRM951) and trace element composition of marine carbonates are key proxies for understanding carbon cycling (pH) and palaeoceanographic change. However, method validation and comparability of results between laboratories requires carbonate reference materials. Here, we report results of an inter‐laboratory comparison study to both assign δ11BSRM951 and trace element compositions to new synthetic marine carbonate reference materials (RMs), NIST RM 8301 (Coral) and NIST RM 8301 (Foram) and to assess the variance of data among laboratories. Non‐certified reference values and expanded 95% uncertainties for δ11BSRM951 in NIST RM 8301 (Coral) (+24.17‰ ± 0.18‰) and NIST RM 8301 (Foram) (+14.51‰ ± 0.17‰) solutions were assigned by consensus approach using inter‐laboratory data. Differences reported among laboratories were considerably smaller than some previous inter‐laboratory comparisons, yet discrepancies could still lead to large differences in calculated seawater pH. Similarly, variability in reported trace element information among laboratories (e.g., Mg/Ca ± 5% RSD) was often greater than within a single laboratory (e.g., Mg/Ca < 2%). Such differences potentially alter proxy‐reconstructed seawater temperature by more than 2 °C. These now well‐characterised solutions are useful reference materials to help the palaeoceanographic community build a comprehensive view of past ocean changes.
DOI: 10.1111/ggr.12363
Authors: Joseph A. Stewart, Steven J. Christopher, John R. Kucklick, Louise Bordier, Thomas B. Chalk, Arnaud Dapoigny, Eric Douville, Gavin L. Foster, William R. Gray, Rosanna Greenop, Marcus Gutjahr, Freya Hemsing, Michael J. Henehan, Philip Holdship, Yu‐Te Hsieh, Ana Kolevica, Yen‐Po Lin, Elaine M. Mawbey, James W. B. Rae, Laura F. Robinson, Rachael Shuttleworth, Chen‐Feng You, Shuang Zhang, Russell D. Day
Institutions: National Institute of Standards and Technology, University of Bristol, Centre National de la Recherche Scientifique, Université de Versailles Saint-Quentin-en-Yvelines, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, Laboratoire des Sciences du Climat et de l'Environnement, National Oceanography Centre, University of Southampton, University of St Andrews, GEOMAR Helmholtz Centre for Ocean Research Kiel, University of Oxford, Yale University, GFZ Helmholtz Centre for Geosciences, National Cheng Kung University
Language: English
Subfield: Atmospheric Science
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,700
Awards: INTRIGUED: INvestigating The Role of the North Pacific In Glacial and Deglacial CO2 and Climate, Deep sea corals in the South Atlantic: new insights from an interdisciplinary study, Carbon cycling in a warming world: a deglacial test case, CO2 reconstruction over the last 100 Myr from novel geological archives, What caused the Mid Pleistocene Transition? Insights from a new high resolution CO2 record, Boron isotopes in carbonates as proxy for seawater paleo-pH: back to basics, Bridging the timing gap: connecting Southern Ocean and Antarctic Climate records, Holocene North-Atlantic Gyres and Mediterranean Overturning dynamic through Climate Changes
OpenAlex ID: W3090367407