Susanne Fietz¹, Dr. Johannes J Viljoen², Ryan Cloete³, Alexander Hayward⁴, Raissa Philibert⁵, Ole Valk⁶, Hélène Planquette⁷, Eva Bucciarelli⁸, Jean C. Loock⁹, Geraldine Sarthou¹⁰, Alakendra Roychoudhury⁶ and Natasha van Horsten¹¹, (1)Stellenbosch University, Department of Earth Sciences, Faculty of Science, Stellenbosch, South Africa, (2)University of Exeter, Department of Earth and Environmental Science, Penryn, United Kingdom, (3)Stellenbosch University, Earth Sciences, Stellenbosch, South Africa, (4)Danish Meteorological Institute, Copenhagen, Denmark, (5)Ecofish Research Ltd, Vancouver, Canada, (6)Stellenbosch University, Centre for Trace Metal and Experimental Biogeochemistry (TracEx), Stellenbosch, South Africa, (7)IUEM Institut Universitaire Européen de la Mer, LEMAR (CNRS, Univ Brest, IRD, Ifremer), Plouzané, France, (8)LEMAR (CNRS, Univ Brest, IRD, Ifremer), Plouzané, France, (9)Stellenbosch University, Stellenbosch, South Africa, (10)IUEM Institut Universitaire Européen de la Mer, LEMAR, CNRS, Plouzané, France, (11)Ifremer, Plouzané, France