STARDUST II - Spatial and Temporal Assessment of high Resolution Depth profiles Using novel Sampling Technologies
The fate of pollutants in fluvial and marine sediments in cross-border zones
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Strong margin influence on the Arctic ocean barium cycle revealed by pan-Arctic synthesis
Whitmore, L.M.; Shiller, A.M.; Horner, T.J.; Xiang, Y.; Auro, M.E.; Bauch, D.; Dehairs, F.; Lam, P.J.; Li, J.; Maldonado, M.T.; Mears, C.; Newton, R.; Pasqualini, A.; Planquette, H.; Rember, R.; Thomas, H. (2022). Strong margin influence on the Arctic ocean barium cycle revealed by pan-Arctic synthesis. JGR: Oceans 127(4): e2021JC017417. https://dx.doi.org/10.1029/2021JC017417
In: Journal of Geophysical Research-Oceans. AMER GEOPHYSICAL UNION: Washington. ISSN 2169-9275; e-ISSN 2169-9291
Peer reviewed article  
Beschikbaar in  Auteurs 
Trefwoord
    Marien/Kust
Author keywords
    GEOTRACES; barium isotopes; geochemical cycles; climate; continental shelves
Auteurs  Top 
  • Whitmore, L.M.
  • Shiller, A.M.
  • Horner, T.J.
  • Xiang, Y.
  • Auro, M.E.
  • Bauch, D.
  • Dehairs, F.
  • Lam, P.J.
  • Li, J.
  • Maldonado, M.T.
  • Mears, C.
  • Newton, R.
  • Pasqualini, A.
  • Planquette, H.
  • Rember, R.
  • Thomas, H.
Abstract
    Early studies revealed relationships between barium (Ba), particulate organic carbon and silicate, suggesting applications for Ba as a paleoproductivity tracer and as a tracer of modern ocean circulation. But, what controls the distribution of barium (Ba) in the oceans? Here, we investigated the Arctic Ocean Ba cycle through a one-of-a-kind data set containing dissolved (dBa), particulate (pBa), and stable isotope Ba ratio (d138Ba) data from four Arctic GEOTRACES expeditions conducted in 2015. We hypothesized that margins would be a substantial source of Ba to the Arctic Ocean water column. The dBa, pBa, and d138Ba distributions all suggest significant modification of inflowing Pacific seawater over the shelves, and the dBa mass balance implies that ~50% of the dBa inventory (upper 500 m of the Arctic water column) was supplied by nonconservative inputs. Calculated areal dBa fluxes are up to 10 µmol m-2 day-1 on the margin, which is comparable to fluxes described in other regions. Applying this approach to dBa data from the 1994 Arctic Ocean Survey yields similar results. The Canadian Arctic Archipelago did not appear to have a similar margin source; rather, the dBa distribution in this section is consistent with mixing of Arctic Ocean-derived waters and Baffin Bay-derived waters. Although we lack enough information to identify the specifics of the shelf sediment Ba source, we suspect that a sedimentary remineralization and terrigenous sources (e.g., submarine groundwater discharge or fluvial particles) are contributors.
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STARDUST II is a project funded by the INTERREG III A programme (France/Walloon Region/Flanders French-Flemish subprogramme) of the European Community's Regional Development Fund.
Hosted by the Flanders Marine Institute (VLIZ)