Chlorophyll pigments and total organic carbon measured during POLARSTERN cruise PS94 (TransArcII) to the Barents Sea and central Arctic

• Main Authors: Kiesel, Joshua, Bienhold, Christina, Link, Heike
• 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; Carbon; organic; total; central Arctic Ocean; Chlorophyll a; per unit sediment volume; Chlorophyll a/chloroplastic pigment equivalents ratio; Chlorophyll pigment equivalents; Climate change; Comment; Date/Time of event; Depth; bottom/max; sediment/rock; top/min; Elevation of event; Event label; Gas chromatography with Carlo Erba NA-1500 CNS elemental analyzer; GBG; Giant box corer; Giant box grab; GKG; Laboratory fluorometer; Turner; Trilogy; Latitude of event; Longitude of event; microbial abundance; MUC; MultiCorer; organic-matter; Phaeopigments; Polarstern; PS94; PS94/001-2; PS94/002-2; PS94/021-2; PS94/032-10; PS94/066-2; PS94/087-2; PS94/101-10; PS94/105-2; Arctic
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.907887; https://doi.org/10.1594/PANGAEA.907887

Chlorophyll pigments: Subsamples of the top first cm of sediment were obtained using cut-off plastic syringes. Samples for chlorophyll pigment analyses were stored dark and frozen at -20°C until further analyses in the home laboratory. Chlorophyll pigments were extracted as described in Boetius et al. (1998, https://doi.org/10.1016/S0967-0637(97)00052-6). Briefly, pigments were extracted in 90% acetone, after addition of glass beads and grinding in a cell mill. Extracts were centrifuged and concentrations of chlorophyll a and phaeopigments (after acidification with HCl) were determined with a Turner Trilogy fluorometer. The sum of chlorophyll a and phaeopigments is expressed as chloroplast pigment equivalents (CPE). The proportion of chlorophyll a from CPE (% chla) is an indicator of the freshness of phytodetritus. Total organic carbon: Subsamples of the top first cm of sediment were also obtained using cut-off plastic syringes. Samples were stored frozen at -20°C until further analyses in the home laboratory. The total carbon content of sediment samples was determined by combustion and gas chromatography with a Carlo Erba NA-1500 CNS elemental analyzer. An aliquot of the sample was acidified to remove the fraction of inorganic carbon and to determine the total amount of organic carbon.