Skip to content

Research at St Andrews

Calibration and application of B/Ca, Cd/Ca and delta11B in Neogloboquadrina pachyderma (sinistral) to constrain CO2 uptake in the subpolar North Atlantic during the last deglaciation

Research output: Contribution to journalArticle

DOI

Author(s)

Jimin Yu, David J. R. Thornalley, James William Buchanan Rae, Nick I. McCave

School/Research organisations

Abstract

[1] The North Atlantic and Norwegian Sea are prominent sinks of atmospheric CO2 today, but their roles in the past remain poorly constrained. In this study, we attempt to use B/Ca and δ11B ratios in the planktonic foraminifera Neogloboquadrina pachyderma (sinistral variety) to reconstruct subsurface water pH and pCO2 changes in the polar North Atlantic during the last deglaciation. Comparison of core-top results with nearby hydrographic data shows that B/Ca in N. pachyderma (s) is mainly controlled by seawater B(OH)4−/HCO3− with a roughly constant partition coefficient inline image of 1.48 ± 0.15 × 10−3 (2σ), and δ11B in this species is offset below δ11B of the borate in seawater by 3.38 ± 0.71‰ (2σ). These values represent our best estimates with the sparse available hydrographic data close to our core-tops. More culturing and sediment trap work is needed to improve our understanding of boron incorporation into N. pachyderma (s). Application of a constant KD of 1.48 × 10−3 to high resolution N. pachyderma (s) B/Ca records from two adjacent cores off Iceland shows that subsurface pCO2 at the habitat depth of N. pachyderma (s) (~50 m) generally followed the atmospheric CO2 trend but with negative offsets of ~10–50 ppmv during 19–10 ka. These B/Ca-based reconstructions are supported by independent estimates from low-resolution δ11B measurements in the same cores. We also calibrate and apply Cd/Ca in N. pachyderma (s) to reconstruct nutrient levels for the same down cores. Like today's North Atlantic, past subsurface pCO2 variability off Iceland was significantly correlated with nutrient changes that might be linked to surface nutrient utilization and mixing within the upper water column. Because surface pCO2 (at 0 m water depth) is always lower than at deeper depths and if the application of a constant KD is valid, our results suggest that the polar North Atlantic has remained a CO2 sink during the calcification seasons of N. pachyderma (s) over the last deglaciation.
Close

Details

Original languageEnglish
Pages (from-to)237-252
JournalPaleoceanography
Volume28
Issue number2
Early online date30 May 2013
DOIs
Publication statusPublished - Jun 2013

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. CO2 storage and release in the deep Southern Ocean on millennial to centennial timescales

    Rae, J. W. B., Burke, A., Robinson, L. F., Adkins, J. F., Chen, T., Cole, C., Greenop, R., Li, T., Littley, E., Nita, D. C., Stewart, J. A. & Taylor, B., 24 Oct 2018, In : Nature. 562, p. 569-573 16 p.

    Research output: Contribution to journalLetter

  2. The effect of ocean acidification on tropical coral calcification: insights from calcification fluid DIC chemistry

    Allison, N., Cole, C., Hintz, C., Hintz, K., Rae, J. & Finch, A., 10 Oct 2018, In : Chemical Geology. 497, p. 162-169 8 p.

    Research output: Contribution to journalArticle

  3. Distribution and ecology of planktic foraminifera in the North Pacific: implications for paleo-reconstructions

    Taylor, B. J., Rae, J. W. B., Gray, W. R., Darling, K., Burke, A., Gersonde, R., Abelmann, A., Maier, E., Esper, O. & Ziveri, P., 1 Jul 2018, In : Quaternary Science Reviews. 191, p. 256-274 19 p.

    Research output: Contribution to journalArticle

  4. What fraction of the Pacific and Indian oceans' deep water is formed in the Southern Ocean?

    Rae, J. W. B. & Broecker, W., 21 Jun 2018, In : Biogeosciences. 15, p. 3779-3794 16 p.

    Research output: Contribution to journalArticle

  5. Deglacial upwelling, productivity and CO2 outgassing in the North Pacific Ocean

    Gray, W. R., Rae, J. W. B., Wills, R. C. J., Shevenell, A. E., Taylor, B., Burke, A., Foster, G. L. & Lear, C. H., 23 Apr 2018, In : Nature Geoscience. 8 p.

    Research output: Contribution to journalArticle

Related by journal

  1. Acceleration of northern ice sheet melt induces AMOC slowdown and northern cooling in simulations of the early last deglaciation

    Ivanovic, R., Gregoire, L., Burke, A., Wickert, A. D., Valdes, P. J., Ng, H. C., Robinson, L. F., McManus, J. F., Mitrovica, J. X., Lee, L. & Dentith, J. E., 27 Jul 2018, In : Paleoceanography and Paleoclimatology. Early View, 18 p.

    Research output: Contribution to journalArticle

  2. Deciphering the state of the late Miocene to early Pliocene equatorial Pacific

    Drury, A. J., Lee, G. P., Gray, W. R., Lyle, M., Westerhold, T., Shevenell, A. E. & John, C. M., 11 Mar 2018, In : Paleoceanography and Paleoclimatology. Early View, 18 p.

    Research output: Contribution to journalArticle

  3. Calibration of the B/Ca proxy in the planktic foraminifer Orbulina universa to Paleocene seawater conditions

    Haynes, L. L., Hönisch, B., Dyez, K. A., Holland, K., Rosenthal, Y., Fish, C. R., Subhas, A. V. & Rae, J. W. B., Jun 2017, In : Paleoceanography. 32, 6, p. 580-599

    Research output: Contribution to journalArticle

  4. The evolution of deep ocean chemistry and respired carbon in the Eastern Equatorial Pacific over the last deglaciation

    de la Fuente, M., Calvo, E., Skinner, L., Pelejero, C., Evans, D., Müller, W., Povea, P. & Cacho, I., Dec 2017, In : Paleoceanography and Paleoclimatology. 32, 12, p. 1371-1385 15 p.

    Research output: Contribution to journalArticle

  5. Geochemical imprints of genotypic variants of Globigerina bulloides in the Arabian Sea

    Sadekov, A. Y., Darling, K. F., Ishimura, T., Wade, C. M., Kimoto, K., Singh, A. D., Anand, P., Kroon, D., Jung, S., Ganssen, G., Ganeshram, R., Tsunogai, U. & Elderfield, H., 29 Oct 2016, In : Paleoceanography. 31, 10, p. 1440-1452 13 p.

    Research output: Contribution to journalArticle

ID: 56000099