Radium Inputs Into the Arctic Ocean From Rivers: A Basin‐Wide Estimate

Bullock, Emma J.; Kipp, Lauren; Moore, Willard; Brown, Kristina; Mann, Paul J.; Vonk, Jorien E.; Zimov, Nikita; Charette, Matthew A.

doi:10.1029/2022JC018964

Radium Inputs Into the Arctic Ocean From Rivers: A Basin‐Wide Estimate

Journal Article · Fri Sep 16 00:00:00 EDT 2022 · Journal of Geophysical Research. Oceans

DOI:https://doi.org/10.1029/2022JC018964· OSTI ID:1887632

^[1]; ^[2]; ^[3]; ^[4]; ^[5]; Vonk, Jorien E. ^[6]; Zimov, Nikita ^[7]; ^[8]

MIT‐WHOI Joint Program in Oceanography/Applied Ocean Science &, Engineering Cambridge and Woods Hole MA USA
Department for Environmental Sciences Rowan University Glassboro NJ USA
Earth, Ocean, and Environment College of Arts and Sciences University of South Carolina Columbia SC USA
Department of Fisheries and Oceans Institute of Ocean Sciences Sidney BC Canada
Department of Geography and Environmental Sciences Northumbria University Newcastle Upon Tyne UK
Faculty of Science, Earth, and Climate Vrije Universiteit Amsterdam Amsterdam The Netherlands
North‐East Scientific Station Pacific Institute for Geography, Far‐East Branch Russian Academy of Sciences Cherskiy Russia
Department of Marine Chemistry and Geochemistry Woods Hole Oceanographic Institution Woods Hole MA USA

Abstract

Radium isotopes have been used to trace nutrient, carbon, and trace metal fluxes inputs from ocean margins. However, these approaches require a full accounting of radium sources to the coastal ocean including rivers. Here, we aim to quantify river radium inputs into the Arctic Ocean for the first time for ²²⁶ Ra and to refine the estimates for ²²⁸ Ra. Using new and existing data, we find that the estimated combined (dissolved plus desorbed) annual ²²⁶ Ra and ²²⁸ Ra fluxes to the Arctic Ocean are [7.0–9.4] × 10 ¹⁴ dpm y ⁻¹ and [15–18] × 10 ¹⁴ dpm y ⁻¹ , respectively. Of these totals, 44% and 60% of the river ²²⁶ Ra and ²²⁸ Ra, respectively are from suspended sediment desorption, which were estimated from laboratory incubation experiments. Using Ra isotope data from 20 major rivers around the world, we derived global annual ²²⁶ Ra and ²²⁸ Ra fluxes of [7.4–17] × 10 ¹⁵ and [15–27] × 10 ¹⁵ dpm y ⁻¹ , respectively. As climate change spurs rapid Arctic warming, hydrological cycles are intensifying and coastal ice cover and permafrost are diminishing. These river radium inputs to the Arctic Ocean will serve as a valuable baseline as we attempt to understand the changes that warming temperatures are having on fluxes of biogeochemically important elements to the Arctic coastal zone.

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Sponsoring Organization:: USDOE

OSTI ID:: 1887632

Alternate ID(s):: OSTI ID: 1888341

Journal Information:: Journal of Geophysical Research. Oceans, Journal Name: Journal of Geophysical Research. Oceans Journal Issue: 9 Vol. 127; ISSN 2169-9275

Publisher:: American Geophysical Union (AGU)Copyright Statement

Country of Publication:: United States

Language:: English

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