Miranda Sitofile¹, Ole Valk², Thapelo Ramalepe¹, Thato Mtshali³, Clément Demasy², Thomas James Ryan-Keogh⁴ and Alakendra Roychoudhury², (1)Stellenbosch University / CSIR, Southern Ocean Carbon-Climate Observatory, Centre for Trace Metal and Experimental Biogeochemistry (TracEx), Stellenbosch, South Africa, (2)Stellenbosch University, Centre for Trace Metal and Experimental Biogeochemistry (TracEx), Stellenbosch, South Africa, (3)Department for Forestry, Fisheries and Environment (DFFE), Cape Town, South Africa, (4)Council for Scientific and Industrial Research (CSIR), Southern Ocean Carbon-Climate Observatory (SOCCO), Cape Town, South Africa