Dissolved iron measurements from 32 stations in the Central Arctic Ocean and Arctic Shelf Sea during POLARSTERN expedition ARK-XXII/2 ...

• Main Authors: Klunder, Maarten B, Laan, Patrick, Middag, Rob, de Baar, Hein J W, Bakker, Karel
• Format: Dataset
• Language: English
• Published: PANGAEA 2012
• Subjects: Event label; Date/Time of event; Latitude of event; Longitude of event; Elevation of event; DEPTH, water; Iron, dissolved; CTD/Rosette, ultra clean; ARK-XXII/2; Polarstern; Global marine biogeochemical cycles of trace elements and their isotopes GEOTRACES; Arctic Ocean; Barents Sea; Kara Sea; laptev; Laptev Sea; Phytoplankton
• Online Access: https://dx.doi.org/10.1594/pangaea.780273; https://doi.pangaea.de/10.1594/PANGAEA.780273

Concentrations of dissolved (<0.2 µm) Fe (DFe) in the Arctic shelf seas and in the surface waters of the central Arctic Ocean are presented. In the Barents and Kara seas, near-surface DFe minima indicate depletion of DFe by phytoplankton growth. Below the surface, lower DFe concentrations in the Kara Sea (~0.4-0.6 nM) than in the Barents Sea (~0.6-0.8 nM) likely reflect scavenging removal or biological depletion of DFe. Very high DFe concentrations (>10 nM) in the bottom waters of the Laptev Sea shelf may be attributed to either sediment resuspension, sinking of brine or regeneration of DFe in the lower layers. A significant correlation (R2 = 0.60) between salinity and DFe is observed. Using d18O, salinity, nutrients and total alkalinity data, the main source for the high (>2 nM) DFe concentrations in the Amundsen and Makarov Basins is identified as (Eurasian) river water, transported with the Transpolar Drift (TPD). On the North American side of the TPD, the DFe concentrations are low (<0.8 nM) ... : Given are all DFe data stations below 300m. ...