Barents Sea, Norwegian Sea, North Sea, and Arctic Ocean

Vertical spatial coordinates; Particulate total and organic carbon concentrations in the water column; Bathymetry and Elevation; Dissolved metal concentrations in the water column; Optical backscatter; Phosphate concentration parameters in the water column; Primary production in the water column; Dissolved total and organic nitrogen concentrations in the water column; Salinity of the water column; Temperature of the water column; Nitrate concentration parameters in the water column; Silicate concentration parameters in the water column; Chlorophyll pigment concentrations in water bodies; Dissolved oxygen parameters in the water column; Horizontal spatial co-ordinates; Visible waveband radiance and irradiance measurements in the water column; Electrical conductivity of the water column; Transmittance and attenuance of the water column; Atmospheric visibility and transparency; Nitrite concentration parameters in the water column; Air temperature; Density of the water column; Air pressure; Wind strength and direction; Experiment state variables; Dissolved total or organic phosphorus concentration in the water column; Atmospheric humidity

Fluorometers; radiometers; optical backscatter sensors; atmospheric radiometers; salinity sensor; autoanalysers; inductively-coupled plasma mass spectrometers; isotope ratio mass spectrometers; nutrient analysers; CTD; transmissometers; discrete water samplers; water body temperature sensor; dissolved gas sensors; meteorological packages

This dataset comprises of data from stainless steel and titanium CTD casts and towfish, results of a nutrient addition incubation experiment, and underway meteorological, hydrographic, and navigational data. The CTD casts and towfish were sampled for biogeochemical properties: nitrate + nitrite, silicate, phosphate, nitrite, d18O, dissolved oxygen, chlorophyll-a, particulate carbon, carbon fixation rates and oxygen isotopes. The CTD casts also comprise of downcast sensor profile data and upcast sensor data at time of bottle firing: temperature, salinity, density, dissolved oxygen, optical backscatter, beam transmittance and attenuation, upward photosynthetically active radiation (PAR), and chlorophyll-a fluorescence. The underway sensor data are sea surface hydrography (temperature and salinity), optical (chlorophyll-a fluorescence, transmission) and meteorological (wind speed and direction, air temperature, air pressure, relative humidity PAR, TIR). The nutrient addition experiments were sampled for Nitrate+nitrite, phosphate, silicate, chlorophyll a, and Fv:Fm after addition of nitrate, phosphate, and/or iron chloride. All of the data were collected during cruise DY167 (GEOTRACES cruise GApr19) in July-August 2023 from Southampton up to 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. These data were collected to better determine how temperature, light, nutrients, and iron control the distribution and activity of nitrogen fixing organisms in the Arctic Ocean. 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).

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