Nitrate isotope measurements from CTD niskin depth profiles from cruise JR17005 in the Fram Strait during May-June 2018.

• Main Authors: Tuerena, Robyn, Ganeshram, Raja
• Format: Dataset
• Language: English
• Published: British Oceanographic Data Centre, National Oceanography Centre, NERC, UK 2021
• Subjects: oceans; Arctic; Arctic Ocean; Fram Strait; North Atlantic Deep Water; North Atlantic
• Online Access: https://dx.doi.org/10.5285/b93fb7c0-110e-2470-e053-6c86abc05d60; https://www.bodc.ac.uk/data/published_data_library/catalogue/10.5285/b93fb7c0-110e-2470-e053-6c86abc05d60/

Nitrate isotope samples were collected onboard the RRS James Clark Ross in the Fram Strait from 8th May - 8th June 2018 as part of the Changing Arctic Ocean programme. Seawater samples were filtered inline from the Niskin bottles, and frozen at -20degC until analysis on land. Samples were measured for δ 15 N-NO3 and δ 18 O-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 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 δ 15 N-NO3 and δ 18 O-NO3 respectively.