Dissolved Cd, Co, Cu, Fe, Mn, Ni and Zn in the Arctic Ocean ...

• Main Authors: Gerringa, Loes, Middag, Rob, Rijkenberg, Micha, Slagter, Hans, Laan, Patrick, Paffrath, Ronja, Bauch, Dorothea, Rutgers Van Der Loeff, Michiel
• Format: Dataset
• Language: unknown
• Published: NIOZ 2021
• Subjects: Arctic; Arctic Ocean; Barents Sea; makarov basin; Nansen Basin
• Online Access: https://dx.doi.org/10.25850/nioz/7b.b.jc; https://dataportal.nioz.nl/doi/10.25850/nioz/7b.b.jc

During the Polarstern (PS94) expedition in summer 2015, part of the international GEOTRACES program sources and sinks of dissolved (D) Cd, Co, Cu, Fe, Mn, Ni and Zn were studied in the central Arctic Ocean. In the Polar Surface Water in which the TransPolar Drift (TPD) is situated, salinity and d18O derived fractions indicated a distinct riverine source for silicate DCo, DCu, DFe, DMn and DNi. Linear relationships between DMn and the meteoric fraction depended on the source distance, likely due to Mn-precipitation with transport time. In the upper 50 m of the Makarov Basin, outside the TPD core, DCo, DMn, DNi, DCd and DCu were enriched by Pacific waters, whereas DFe seemed diluted. DCo, DFe, DMn and DZn were relatively high in the Barents Sea and enriched Atlantic water going into the Nansen Basin. Deep concentrations of all metals were significantly lower in the Makarov Basin compared to the Nansen and Amundsen, the Eurasian, Basins. The Gakkel Ridge hydrothermal input and higher continental slope ...