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: Barents Sea; Central Arctic Ocean; Climate change; microbial abundance; organic-matter; Sediment oxygen uptake; Event label; Date/Time of event; Latitude of event; Longitude of event; Elevation of event; Oxygen uptake, diffusive; Comment; MultiCorer; Giant box corer; PS94; Polarstern; Assessment of bacterial life and matter cycling in deep-sea surface sediments ABYSS; System Laptev-Sea Transdrift TRANSDRIFT; Arctic Ocean; laptev; Laptev Sea
• Online Access: https://dx.doi.org/10.1594/pangaea.907883; https://doi.pangaea.de/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. ...