Arctic Radium Isotope Observing Network (ARION) 2023 - radium, water isotopes, and salinity along Laptev & East Siberian Sea margins

Radium isotopes are continuously produced at ocean boundaries and are soluble in seawater. Radium therefore serves as an analogue for similarly sourced shelf-derived materials, including biologically important elements such as carbon, nutrients, and trace metals. To test the hypothesis that climate change is leading to increased delivery of terrestrially-derived solutes to the Arctic Ocean, radium levels are measured on bi-annual cruises along the Laptev and East Siberian Sea margins (to capture interannual changes) and on a first-of-its kind in situ radium isotope sampler (to capture seasonal changes). These sampling efforts are complemented by an international network of collaborators that will contribute data to create an Arctic Radium Isotope Observing Network (ARION) that spans the Arctic Ocean and will serve the greater scientific community. This dataset contains the (1) results of the water column measurements made on the second ARION cruise, which took place in August-October 2023 along the slopes of the East Siberian and Laptev Seas in collaboration with the Nansen and Amundsen Basin Observational Systems (NABOS) program, and (2) results from two moored radium in situ samplers (MoRIS) deployed on the Laptev and East Siberian Slopes from 2021-2023. Parameters measured include radium-228, radium-226, oxygen-18, deuterium, salinity, and barium.