Daniel François Nascimento Silva, Royal Netherlands Institute for Sea Research, Den Burg, North Holland, NETHERLANDS, Gert-Jan Reichart, NIOZ, Royal Netherlands Institute for Sea Research, Department of Ocean Systems, and Utrecht University, Fac Geosci, Dept Earth Sci, Texel, Netherlands and Lennart de Nooijer, Royal Netherlands Institute for Sea Research (NIOZ), Department of Ocean Systems, Texel, Netherlands