Dr Joseph Stewart

PhD (Soton.), MESc (Oxon.)

  • BS8 1RJ


Research output per year

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Personal profile

Research interests

I am an isotope geochemist studying the chemistry of marine biogenic carbonates to better understand the chemistry of the seawater in which these organisms lived.

My previous research has involved the taxonomic classification and geochemical measurement of ancient calcified plankton (foraminifera) recovered from deep ocean sediment cores to reconstruct ancient seawater temperatures (e.g. Mg/Ca) and changing patterns of continental weathering (e.g. Nd isotopes)

More recently research efforts have been focused on the refinement and application of boron isotope proxy for seawater pH measured in corals and calcified algae. The aims of this research are (i) to identify suitable coral substrates for use as pH biosensors, (ii) document changes in past ocean pH and (iii) to further our understanding of coral bio-mineralization and the impact of ocean acidification on marine califiers. 

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Research Output

  • 15 Article (Academic Journal)
  • 1 Letter (Academic Journal)

Morphological, elemental, and boron isotopic insights into pathophysiology of diseased coral growth anomalies

Andersson, K. E., Stewart, J., Work, T. M., Woodley, C., Schock, T. & Day, R., 19 May 2020, In : Scientific Reports. 10, 13 p., 8252 (2020).

Research output: Contribution to journalArticle (Academic Journal)

Open Access
  • 23 Downloads (Pure)

    Refining trace metal temperature proxies in cold-water scleractinian and stylasterid corals

    Stewart, J. A., Robinson, L. F., Strawson, I., Spooner, P. T., Samperiz, A., Bratt, R., Pryer, H. & al., E., 22 Jun 2020, In : Earth and Planetary Science Letters. 545, 13 p., 116412.

    Research output: Contribution to journalArticle (Academic Journal)

  • 10 Downloads (Pure)

    Stylasterid corals: A new paleotemperature archive

    Samperiz, A., Robinson, L. F., Stewart, J. A., Strawson, I., Leng, M. J., Rosenheim, B. E., Ciscato, E. R., Hendry, K. R. & Santodomingo, N., 25 Jun 2020, In : Earth and Planetary Science Letters. 545, 11 p., 116407.

    Research output: Contribution to journalArticle (Academic Journal)

    Open Access
  • 9 Downloads (Pure)