Damian Leonardo Arévalo Martínez¹, Marcel Sommer², Paula Eisnecker³, Rena Czeschel Czeschel⁴, Gesa Schulz⁵, Ina Stoltenberg² and Hermann Bange², (1)Leibniz Institute for Baltic Sea Research Warnemünde, Marine Chemistry, Rostock, Germany, (2)GEOMAR Helmholtz Centre for Ocean Research Kiel, Chemical Oceanography, Kiel, Germany, (3)University of the Azores, Azores, Portugal, (4)GEOMAR Helmholtz Centre for Ocean Research Kiel, Physical Oceanography, Kiel, Germany, (5)University of Hamburg, Hamburg, Germany