Biogeochemistry of iron in coastal Antarctica: isotopic insights for external sources and biological uptake in the Amundsen Sea polynyas

Tian, Hung-An; van Manen, Mathijs; Bunnell, Zach B.; Jung, Jinyoung; Lee, Sang Hoon; Kim, Tae-Wan; Reichart, Gert-Jan; Conway, Tim M.; Middag, Rob

doi:10.1016/j.gca.2023.10.029

Cited by 4 publications

(1 citation statement)

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“…Each ocean margin studied adds new insight to the picture, highlighting both the excitement and the utility of these new datasets as well as the added complexity that must be considered when parameterizing global models. So far, Fe isotopes have been used to constrain either RD or NRD sediment fluxes to the water column, but it is likely that the two mechanisms of release may need to be considered together as contributors to sediment dFe release (and influencing of δ 56 Fe) in overlying shelf and slope environments (Tian et al, 2023).…”

Section: Spotlight On Marine Sediments As An Fe Sourcementioning

confidence: 99%

GEOTRACES: Ironing Out the Details of the Oceanic Iron Sources?

Conway,

Middag,

Schlitzer

2024

Oceanog

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Dissolved iron (dFe) is an essential micronutrient for phytoplankton, with vanishingly low oceanic dissolved concentrations (pico- to nanomoles per kg) known to limit growth—and thus influence primary productivity and carbon cycling—over much of the surface ocean. However, because of the considerable challenges associated with contamination-free sample collection and accurate analysis of such low dFe concentrations, the first reliable dFe measurements came only in the 1980s. Further, by 2003, despite several decades of research, there were only ~25 full-depth oceanic dFe profiles worldwide, with dust considered to be the main oceanic dFe source. Since 2008, facilitated by the extensive field campaign and rigorous intercalibration of the international GEOTRACES program, there has been an “explosion” in the availability of oceanic dFe data, with hundreds of profiles now available. Concurrently, there has been a paradigm shift to a view of the marine Fe cycle where multiple sources contribute, and some forms of dFe can be transported great distances through the intermediate and deep ocean. Here, we showcase the GEOTRACES dFe datasets across the different ocean basins, synthesize our current multi-source view of the oceanic Fe cycle, spotlight sediments as an important dFe source, and look to future directions for constraining oceanic dFe boundary exchange.

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Section: Spotlight On Marine Sediments As An Fe Sourcementioning

confidence: 99%