Thomas Frederikse, NASA Jet Propulsion Laboratory, Pasadena, CA, United States, Surendra Adhikari, California Institute of Technology, Jet Propulsion Laboratory, Pasadena, CA, United States, Tim Daley, Plymouth University, Plymouth, United Kingdom, Sönke Dangendorf, Old Dominion University, Ocean, Earth & Atmospheric Sciences, Norfolk, United States, W Roland Gehrels, University of York, York, YO10, United Kingdom, Felix W Landerer, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States, Marta Marcos, Mediterranean Institute for Advanced Studies (UIB-CSIC), Esporles, Spain; University of the Balearic Islands, Department of Physics, Palma, Spain, Thomas Newton, University of Plymouth, Plymouth, United Kingdom, Aimee Slangen, Royal Netherlands Institute for Sea Research, Den Burg, Netherlands and Guy Woppelmann, LIENSs, Université de la Rochelle-CNRS, La Rochelle, France