Simon Wett, Institute of Oceanography, Center for Earth System Research and Sustainability (CEN), University of Hamburg, Hamburg, Germany, Eleanor Frajka-Williams, University of Hamburg, Hamburg, Germany, Nicholas Harmon, Woods Hole Oceanographic Institution, Geology & Geophysics, Woods Hole, United States, Catherine Rychert, Woods Hole Oceanographic Institution, Ocean and Earth Science, Woods Hole, MA, United States, Shane Elipot, University of Miami, Rosenstiel School of Marine, Atmospheric, and Earth Science, Miami, United States, Ben I Moat, National Oceanography Centre, Southampton, United Kingdom and David Smeed, National Oceanography Center, Soton, Southampton, United Kingdom