Total oxygen fluxes of four sediment cores from Isla D (Potter Cove, Antarctica) exposed to increasing light intensities measured in December 2016

Four sediment cores (50 cm length, 10 cm diameter) were collected from the Isla D station (located in Potter Cove) by SCUBA divers in December 2016. The sediment cores were stored in a water bath at in situ temperature of 0.5°C. A magnetic stirrer was inserted into the core and the overlying water was permanently aerated. Thereby, the overlying water was kept homogeneous and oxygen saturated. Cold-light lamps (Osram Lumilux Cool Daylight L36W/865, Osram, Munich, Germany) were installed above the sediment cores and the emitted photosynthetically active radiation (PAR) was permanently controlled with a spherical PAR-sensor (US-SQS/L and ULM-500, Walz, Germany). The spherical PAR-sensor was placed in the water bath, adjusted to the lowest height of the sediment surface of the sediment cores, covered with sea-water and treated similar to the sediment cores. […]