Nitrate isotope measurements from CTD niskin depth profiles from Changing Arctic Ocean cruise JR16006 in the Barents Sea during summer 2017
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Nitrate isotope samples were collected onboard the RRS James Clark Ross in the Barents Sea from 30/06/2017-08/08/2017 as part of the Changing Arctic Oceans project. Seawater samples were filtered inline from the Niskin bottles, and frozen at -20°C until analysis on land. Samples were measured for δ15N-NO3 and δ18O-NO3 of nitrate using the Denitrifier method and bacterial strain P. aureofaciens. Samples were corrected using international reference standards IAEA-N3 and USGS-34 and an internal standard of North Atlantic Deep Water was run with each batch to check for inter-run comparability. Final values were calculated using the correction scheme of Weigand et al., (2016) with reproducibility of 0.1 and 0.3‰ for δ15N-NO3 and δ18O respectively.
