Lilian A Krug¹, Fiona Beckman², Andrew Paul Rees³, Angelika Dummermuth⁴, Bärbel Wichmann⁵, Eva-Maria Brodte⁵, Karen H Wiltshire⁶, Peter Croot⁷ and Sophie Seeyave², (1)Partnership for Observation of the Global Ocean (POGO), Centre of Marine Sciences of the Algarve (CCMAR), Faro, Portugal, (2)Partnership for Observation of the Global Ocean (POGO), Plymouth, United Kingdom, (3)Plymouth Marine Laboratory, Plymouth, United Kingdom, (4)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Bremerhaven, Bremerhaven, Germany, (5)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Helgoland, Helgoland, Germany, (6)Alfred Wegener Institute Helmholtz-Wadden Sea Station Sylt, Coastal Ecology, List, Germany, (7)University of Galway, School of Natural Sciences, Earth and Ocean Sciences, Galway, Ireland