Source and fate of atmospheric iron supplied to the subarctic North Pacific traced by stable iron isotope ratios

Kurisu, Minako; Sakata, Kohei; Nishioka, Jun; Obata, Hajime; Conway, Tim M.; Hunt, Hannah R.; Sieber, Matthias; Suzuki, Katsuhiko; Kashiwabara, Teruhiko; Kubo, Sayuri; Takada, Makoto; Takahashi, Yoshio

doi:10.1016/j.gca.2024.06.009

Geochimica et Cosmochimica Acta

2024

DOI: 10.1016/j.gca.2024.06.009

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Source and fate of atmospheric iron supplied to the subarctic North Pacific traced by stable iron isotope ratios

Minako Kurisu,

Kohei Sakata,

Jun Nishioka

et al.

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Long Distance Transport of Subsurface Sediment‐Derived Iron From Asian to Alaskan Margins in the North Pacific Ocean

Sieber,

Lanning,

Steffen

et al. 2024

Geophysical Research Letters

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The international GEOTRACES program has been instrumental in demonstrating how marine sediments are a critical source of dissolved Fe to the world's oceans. Here, we present dissolved iron (dFe) from the GEOTRACES North Pacific GP15 section, which, alongside other sediment‐source tracers (including dissolved δ56Fe, Mn, 228Ra, and particulate Fe), allows for identification of the dFe provenance of three distinct dFe depth maxima at the Alaskan margin. Two of these (shelf and abyssal depths) are of local Alaskan sedimentary origin. The third, a mid‐depth dFe maximum with an absence of 228Ra, is an advected signal that, based on tracer data from Western Pacific GEOTRACES transects and circulation models, must be advected from sedimentary sources on the Asian margin, ∼5,000 km away. This study illustrates the importance of measuring diagnostic sedimentary tracers like radium when assigning local margins as sedimentary sources of marine trace metal budgets.

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Long Distance Transport of Subsurface Sediment‐Derived Iron From Asian to Alaskan Margins in the North Pacific Ocean

Sieber,

Lanning,

Steffen

et al. 2024

Geophysical Research Letters

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show abstract

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Source and fate of atmospheric iron supplied to the subarctic North Pacific traced by stable iron isotope ratios

Cited by 1 publication

References 126 publications

Long Distance Transport of Subsurface Sediment‐Derived Iron From Asian to Alaskan Margins in the North Pacific Ocean

Long Distance Transport of Subsurface Sediment‐Derived Iron From Asian to Alaskan Margins in the North Pacific Ocean

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