Stephen Kohler¹, Alyssa Azaroff², Helena Anzjøn¹, Murat V Ardelan³, Alicia Garcia-Garcia⁴, Orjan Gustafsson², Lars-Eric Heimbürger⁵, Alina Kleindienst², Nicolas Sanchez³, Cristina M Segovia⁶, Jeroen Sonke⁷, Evgeniy Yakushev⁸ and Sofi Jonsson², (1)Norwegian University of Science and Technology, Trondheim, Norway, (2)Stockholm University, Stockholm, Sweden, (3)Norwegian University of Science and Technology, Department of Chemistry, Trondheim, Norway, (4)University of Zaragoza, Zaragoza, Spain, (5)Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO), Marseille, France, (6)University of Valladolid, Valladolid, Spain, (7)CNRS/OMP/Université de Toulouse, Géosciences Environnement Toulouse, Toulouse, France, (8)Norwegian Institute for Water Research, Oslo, Norway