Concentration of Particulate Organic Carbon (POC) from the sea water and sea ice in the northern Barents Sea as part of the Nansen Legacy project, Cruise 2018707, JC1_2

This dataset includes concentrations of Particulate Organic Carbon (POC) from the sea water, sea ice, melt pond water and brine.

Samples were collected in August 2018 as part of cruise 2018707, JC1_2, in the northern Barents Sea as part of the Nansen Legacy project.

Sea water was sampled at seven different stations using Niskin bottles attached to a rosette onboard R/V Kronprins Haakon.

Samples from sea ice were collected at three stations (gear: Kovacs ice corer 9cm). A sample of the brine in the core holes was collected from one of these. Under-ice water (0.5m) were collected at two stations (gear: Go-Flo Water Sampler) from a hole in the ice. Samples from melt ponds were collected at four stations (five sites) using a bottle.

All samples were collected on pre-combusted Whatman GF/F filters. For sea water we prepared duplicate subsamples (250-700 mL). For melted sea ice, melt pond water and brine where the volume of water was limited and/or the particle load high, the sample volume was reduced (150-500 mL) or occasionally limited to one sample.

Filters were air dried and stored at room temperature until analysis on a Flash 2000 Organic Elemental Analyzer (Thermo Scientific). Presented are averaged POC values (in mg m-3). (PON data omitted due to inconsistent results). Standard errors were estimated according to Hozo et al 2005.