Theo Spira^1,2, Marcel du Plessis¹, Alexander Haumann^2,3, Isabelle Giddy¹, Aditya Narayanan⁴, Alessandro Silvano⁵ and Sebastiaan Swart^1,6, (1)University of Gothenburg, Department of Marine Sciences, Gothenburg, Sweden, (2)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Bremerhaven, Bremerhaven, Germany, (3)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research, Bremerhaven, Germany, (4)University of Southampton, Ocean and Earth Science, Southampton, United Kingdom, (5)University of Southampton, School of Ocean and Earth Science, Southampton, United Kingdom, (6)University of Cape Town, Department of Oceanography, Cape Town, South Africa