Concentrations of nitrate, nitrite, phosphate, silicic acid, Chlorophyll a, as well as particulate organic carbon and nitrogen from discrete samples were collected by individual Niskin bottle hauls. Samples for nutrient analysis were pre-filtered through 0.2µm filters and subsequently frozen at -20°C. Samples were analyzed colorimetrically on a QuAAtro autoanalyzer (Seal). Instrument performance was monitored by measuring certified reference materials (JAMSTEC). Detection limits were 0.02 mmol L-1 for NO3, 0.004 mmol L-11 for PO4, and 0.01 mmol L-1 for Si(OH)4. Concentrations of Chlorophyll a (Chl-a) were determined after gentle filtration onto precombusted GF/F filters (nominal pore size 0.7µm), homogenization using a cell mill, and subsequently extraction in 90% acetone at -20°C over night. Chl-a concentrations were measured on the following day using a Turner flourometer including an acidification step. Concentrations of particulate organic carbon and nitrogen were determined after gentle filtration onto precombusted GF/F filters (nominal pore size 0.7µm). FIlters were frozen, dried, acidified with HCl to remove inorganic particulate carbon, and subsequently measured on an elemental analyser (Hekatech).
Hoppe C. J. M., Heitmann L., Wolf K. K. E. & Rost B., 2026. Spring-time seawater chlorophyll a, organic matter and macronutrient concentrations at midfjord station KB3 of Kongsfjorden, Svalbard (2014 et seq.) [dataset publication series]. PANGAEA. Article.
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