Porewater nutrients of the Northeast Greenland (NEG) shelf sediments from POLARSTERN cruise PS109

• Main Authors: Braeckman, Ulrike, Felden, Janine
• Format: Dataset
• Language: English
• Published: PANGAEA 2024
• Subjects: Ammonia; ARK-XXXI/4; Carbon; inorganic; dissolved; Continuous Segmented Flow Analyzer; SEAL Analytical; QuAAtro39; Date/Time of event; Depth; bottom/max; sediment/rock; top/min; dissolved inorganic carbon (DIC); Elevation of event; Event label; FRAM; FRontiers in Arctic marine Monitoring; Latitude of event; Longitude of event; Method/Device of event; Multicorer with television; nitrate; Nitrate and Nitrite; nitrite; nutrients; Phosphate; Polarstern; PS109; PS109_105-1; PS109_115-2; PS109_122-1; PS109_125-2; PS109_139-2; PS109_154-1; PS109_19-2; PS109_36-2; PS109_45-4; PS109_61-1; PS109_62-1; PS109_76-2; PS109_93-2; Sample comment; silicate; Subsample ID; Arctic; Greenland
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.959549; https://doi.org/10.1594/PANGAEA.959549

Sediment porewater chemistry (nutrient, DIC, sulfide and sulfate) on the Northeast Greenland shelf were assessed with R/V Polarstern during PS109 between September and October 2017 using two cores with pre-drilled holes mounted on a multiple corer (MUC) a camera-equipped multiple corer (TV-MUC; core area 0.007 m²). Upon arrival on deck, Rhizon samplers were inserted carefully into the holes with intervals of 1 cm until 10 cm sediment depth, and 2 cm intervals until 20 cm sediment depth to extract the sediment porewater. To get a total of 9 ml/l porewater for each depth interval, the porewater from both cores was pooled for each depth. For the analysis of DIC, 2 ml/l porewater from each depth was transferred to a glass vial which had been pre-treated with HgCl₂ and stored at 4°C. DIC concentrations were measured using a flow injection system equipped with the Spark Optimas auto-sampler (model 820, Ambacht, Netherlands). For the determination of porewater nutrients, 4 ml/l of porewater was sampled with acid-washed Sarstedt Vials and stored at -20°C. In the laboratory, 4 ml/l was subsampled for phosphate, silicate and ammonium, while 1 ml/l was subsampled for nitrate and nitrite, and subsequently analyzed with a Continuous Segmented Flow Analyser (QuAAtro39, SEAL Analytical, Norderstedt, Germany).