Diffusive oxygen uptake rates measured during POLARSTERN cruise PS94 (TransArcII) to the Barents Sea and central Arctic

• Main Authors: Kiesel, Joshua, Link, Heike, Wenzhöfer, Frank
• Format: Dataset
• Language: English
• Published: PANGAEA 2019
• Subjects: ABYSS; Arctic Ocean; ARK-XXIX/3; Assessment of bacterial life and matter cycling in deep-sea surface sediments; Barents Sea; Central Arctic Ocean; Climate change; Comment; Date/Time of event; Elevation of event; Event label; Giant box corer; GKG; Latitude of event; Longitude of event; microbial abundance; MUC; MultiCorer; organic-matter; Oxygen uptake; diffusive; Polarstern; PS94; PS94/001-2; PS94/002-2; PS94/021-2; PS94/032-10; PS94/087-2; PS94/101-10; PS94/105-2; PS94/123-2; PS94/130-4; PS94/149-5/6; PS94/161-6; Sediment oxygen uptake; System Laptev-Sea: Transdrift; TRANSDRIFT; Arctic; laptev; Laptev Sea
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.907883; https://doi.org/10.1594/PANGAEA.907883

We assessed diffusive oxygen uptake rates by measuring ex situ porewater oxygen microprofiles. Sediment cores were placed in a water bath and a stirring device was implemented in each core to homogenize the overlying water column and, to create a diffusive boundary layer (DBL) that was similar to in situ conditions. Microprofiles were measured using fiber-optical needle sensors (OXR50 & OXR230) constructed at Pyroscience® (Germany). After two-point calibration (0 % & 100 %) with bottom water taken from the rosette at the same station, the sensors were connected to a Firesting O2 oxygen meter (Pyroscience®) and controlled by using a computer-run micromanipulator. Vertical resolution was programmed to 100 μm, with resting time per data point of 5 seconds. Profile length was programed to be 6.5 cm.