Water column data on dissolved inorganic nutrients (nitrite, nitrate, phosphate and silicic acid) from the Nansen and Amundsen Basins in the Arctic Ocean 2022 (AO2022) cruise, 2022710, with R.V. Kronprins Haakon, 24 July - 19 August 2022

The cruise 2022710 aboard the Research Vessel Kronprins Haakon covered the central Arctic Ocean as part of the project “Sustainable Development in the Arctic Ocean-SUDARCO” within the FRAM-High North Research Centre for Climate and the Environment and aims to establish a holistic understanding and of a changing marine Arctic climate and ecosystem and the societal impact. Water column temperature and salinity profiles were obtained with a conductivity-temperature-depth (CTD) sensor system Sea-Bird SBE 911+ mounted on a General Oceanics rosette sampler equipped with 24 Niskin bottles used for seawater sampling of chemical variables in the water column. Samples for the determination of dissolved inorganic nutrients were collected from full water column at a total of 24 stations in the northern Barents Sea and northern Svalbard shelf. The seawater samples were collected from Niskin bottles in 20 ml plastic HDPE vials (rinsed three times) and preserved with 250 µL chloroform and stored +4C and dark until post-cruise analysis of nitrite (NO2), nitrate (NO3-), phosphate (PO43-), and silicate (Si(OH)4), on an automated analysis (AA) system from Skalar Analytical B.V. (The Netherlands). Methods followed standard colorimetric methods first described by Bendschneider & Robinson (1952) and Grasshof (1965) at the chemical laboratory at Institute of Marine Research, Bergen, Norway. For specific methodological details see Gundersen et al., 2022. Three replicates were analyzed for each sample. The detection limits are 0.06 µmol/L, 0.5 µmol/L, 0.06 µmol/L and 0.7 µmol/L for NO2, NO3-, PO43-, and Si(OH)4, respectively. Ancillary data from the water column is published in Dodd et al., 2022 and described in the cruise report. The study was funded by the Klima og Miljø Departementet (KLD) og Nærings-og Fiskeri Departementet (NFD) through the FRAM-High North Research Centre for Climate and the Environment.