Kevin Niklas Wiegand¹, Simo-Matti Siiriä², Jan Even Øie Nilsen³, Birgit A Klein¹, Meike Martins¹, Colin A Stedmon⁴, Bodil Berendt Toftegård⁴, Laura Tuomi⁵, Kjell Arne Mork⁶, Waldemar Walczowski⁷, Małgorzata Merchel⁸ and Henry C Bittig⁹, (1)BSH Federal Maritime and Hydrographic Agency, Hamburg, Germany, (2)Finnish Meteorological Institute (FMI), Helsinki, Finland, (3)Norwegian Meteorological Institute, Oslo, Norway, (4)Technical University of Denmark, National Institute of Aquatic Resources, Kongens Lyngby, Denmark, (5)Finnish Meteorological Institute, Helsinki, Finland, (6)Institute of Marine Research Bergen, Bergen, Norway, (7)Institute of Oceanology of the Polish Academy of Sciences, Sopot, Poland, (8)Institute of Oceanology Polish Academy of Sciences, Sopot, Poland, (9)Leibniz Institute for Baltic Sea Research, 18119 Warnemunde, Germany