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Sebastiaan van de Velde imageContact

Office 360 Leith Street, room G.S08
Tel +64 21 279 0770
Email sebastiaan.vandevelde@otago.ac.nz

Google scholar

Academic qualifications

  • BSc in Chemistry, Vrije Universiteit Brussel (Belgium)
  • MSc in Analytical and Environmental Chemistry, Vrije Universiteit Brussel (Belgium)
  • PhD in Science, Vrije Universiteit Brussel & Antwerp University (Belgium)

Research interests

Sebastiaan is affiliated with the NIWA – University of Otago centre for Oceanography and leads the NIWA carbonate chemistry facilities hosted at the University of Otago. He also manages the Munida time series and the New Zealand Ocean Acidification Observation Network (NZOA-ON). His research interests broadly include marine carbonate chemistry and sedimentary biogeochemistry, with a focus on coastal carbon cycling.

Courses

  • EAOS 111 Earth and Ocean Science
  • MARI 322 Coastal and Shelf Seas Oceanography (Paper Co-ordinator)

Current postgraduate students

  • Kayleigh O'Reilly, MSc: Determining the contribution of sediments on coastal alkalinity
  • Mikayla Robson, MSc: Contribution of Aotearoa beach sand dissolution to CO2 uptake

Publications

Friedlingstein, P., O'Sullivan, M., Jones, M. W., Andrew, R. M., Bakker, D. C. E., Hauck, J., … van de Velde, S. J., … Zeng, J. (2026). Global Carbon Budget 2025. Earth System Science Data, 18(5), 3211-3288. doi: 10.5194/essd-18-3211-2026 Journal - Research Article

Goossens, C., van de Velde, S. J., & Meysman, F. J. R. (2026). A revised estimate of calcium carbonate dissolution in coastal and shelf sediments suggests large shelf exports in the marine CaCO3 cycle. Global Biogeochemical Cycles, 40(3), e2025GB008936. doi: 10.1029/2025GB008936 Journal - Research Article

van de Velde, S. J., Vervoort, P., Smith, R. O., Law, C. S., & Currie, K. (2026). Anthropogenically stimulated carbonate dissolution in the global shelf seafloor is potentially an important and fast climate feedback. AGU Advances, 7(1), e2025AV001865. doi: 10.1029/2025AV001865 Journal - Research Article

Placitu, S., van de Velde, S. J., Hylén, A., Eriksson, M., Hall, P. O. J., & Bonneville, S. (2025). Limited physical protection leads to high organic carbon reactivity in anoxic Baltic Sea sediments. Biogeosciences, 22, 8065-8076. doi: 10.5194/bg-22-8065-2025 Journal - Research Article

Hylén, A., Ekeroth, N., Berk, H., Dale, A. W., Kononets, M., Lenstra, W. K., … van de Velde, S. J., … Hall, P. O. J. (2025). In situ-measured benthic fluxes of dissolved inorganic phosphorus in the Baltic Sea. Earth System Science Data, 17, 6423-6443. doi: 10.5194/essd-17-6423-2025 Journal - Research Article

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