Titanium CTD water column samples (macronutrients, chlorophyll-a, trace elements) and upcast sensor measurements (temperature, salinity, oxygen, optical backscatter, beam transmittance and attenuation, PAR, fluorescence) from the Norwegian and Barents Sea on cruise DY167 (GApr19), July-August 2023

This dataset contains sampled biogeochemical properties (nitrate + nitrite, silicate, phosphate, nitrite, chlorophyll-a, and dissolved iron and manganese) from Niskin bottles fired on 22 titanium CTD casts and the accompanying upcast sensor measurements (temperature, salinity, dissolved oxygen, optical backscatter, beam transmittance and attenuation, upward photosynthetically active radiation (PAR), and chlorophyll-a fluorescence). The samples were collected during cruise DY167 (GEOTRACES cruise GApr19) in July-August 2023 in the Norwegian and Barents Seas and cover the relatively warm Atlantic Water inflow, fresher water on the Spitzbergen Bank, coastal/glacial outflow around Svalbard, and Arctic water around sea ice. Samples were taken from 10 L Niskin bottles that were fired on the upcasts. The samples were filtered through a 0.2 um acetate membrane filter to determine nutrients (using colorimetric method and a Bran and Luebbe QuAAtro 5-Channel Nutrient Auto-analyser) and trace elements (using offline pre-concentration and extraction and Inductively Coupled Plasma Mass Spectrometry (ICP-MS)); and through a 0.7 um (GF/F) filter to determine chlorophyll-a (frozen for 24 hours then measured using a Turner Design Field fluorometer). Raw sensor data were processed and averaged within 5 second windows around the time of each bottle firing, and salinity and chlorophyll-a data were calibrated against independent in-situ samples. This dataset was generated by the National Oceanography Centre (NOC), the University of Liverpool (UoL), and the University of Southampton, under Natural Environment Research Council (NERC) Discovery Science grant "Nitrogen fixation in the Arctic Ocean", N-ARC (grant numbers NE/T000570/1 and NE/T001240/1).