Long Distance Transport of Subsurface Sediment‐Derived Iron From Asian to Alaskan Margins in the North Pacific Ocean
Abstract 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 trace...
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Wiley
2024-10-01
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| Series: | Geophysical Research Letters |
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| Online Access: | https://doi.org/10.1029/2024GL110836 |
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| author | M. Sieber N. T. Lanning J. M. Steffen X. Bian S.‐C. Yang J. M. Lee G. Weiss H. R. Hunt M. A. Charette W. S. Moore S. L. Hautala M. Hatta P. J. Lam S. G. John J. N. Fitzsimmons T. M. Conway |
| author_facet | M. Sieber N. T. Lanning J. M. Steffen X. Bian S.‐C. Yang J. M. Lee G. Weiss H. R. Hunt M. A. Charette W. S. Moore S. L. Hautala M. Hatta P. J. Lam S. G. John J. N. Fitzsimmons T. M. Conway |
| author_sort | M. Sieber |
| collection | DOAJ |
| description | Abstract 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. |
| format | Article |
| id | doaj-art-98d18ba8903a4c87b8e9f0f1bce21a19 |
| institution | Kabale University |
| issn | 0094-8276 1944-8007 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geophysical Research Letters |
| spelling | doaj-art-98d18ba8903a4c87b8e9f0f1bce21a192024-11-11T10:10:52ZengWileyGeophysical Research Letters0094-82761944-80072024-10-015120n/an/a10.1029/2024GL110836Long Distance Transport of Subsurface Sediment‐Derived Iron From Asian to Alaskan Margins in the North Pacific OceanM. Sieber0N. T. Lanning1J. M. Steffen2X. Bian3S.‐C. Yang4J. M. Lee5G. Weiss6H. R. Hunt7M. A. Charette8W. S. Moore9S. L. Hautala10M. Hatta11P. J. Lam12S. G. John13J. N. Fitzsimmons14T. M. Conway15College of Marine Science University of South Florida Tampa FL USADepartment Oceanography Texas A&M University College Station TX USADepartment Oceanography Texas A&M University College Station TX USADepartment Earth Sciences University of Southern California Los Angeles CA USADepartment Earth Sciences University of Southern California Los Angeles CA USADepartment Ocean Sciences University of California Santa Cruz CA USADepartment Oceanography University of Hawaii Honolulu HI USACollege of Marine Science University of South Florida Tampa FL USADepartment of Marine Chemistry and Geochemistry Woods Hole Oceanographic Institution Falmouth MA USASchool of the Earth Ocean & Environment University of South Carolina Columbia SC USASchool of Oceanography University of Washington Seattle WA USADepartment Oceanography University of Hawaii Honolulu HI USADepartment Ocean Sciences University of California Santa Cruz CA USADepartment Earth, Atmospheric, and Planetary Sciences Massachusetts Institute of Technology Cambridge Cambridgeshire USADepartment Oceanography Texas A&M University College Station TX USACollege of Marine Science University of South Florida Tampa FL USAAbstract 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.https://doi.org/10.1029/2024GL110836iron isotopesmanganeseradiumparticlesGEOTRACESmarine trace metals |
| spellingShingle | M. Sieber N. T. Lanning J. M. Steffen X. Bian S.‐C. Yang J. M. Lee G. Weiss H. R. Hunt M. A. Charette W. S. Moore S. L. Hautala M. Hatta P. J. Lam S. G. John J. N. Fitzsimmons T. M. Conway Long Distance Transport of Subsurface Sediment‐Derived Iron From Asian to Alaskan Margins in the North Pacific Ocean Geophysical Research Letters iron isotopes manganese radium particles GEOTRACES marine trace metals |
| title | Long Distance Transport of Subsurface Sediment‐Derived Iron From Asian to Alaskan Margins in the North Pacific Ocean |
| title_full | Long Distance Transport of Subsurface Sediment‐Derived Iron From Asian to Alaskan Margins in the North Pacific Ocean |
| title_fullStr | Long Distance Transport of Subsurface Sediment‐Derived Iron From Asian to Alaskan Margins in the North Pacific Ocean |
| title_full_unstemmed | Long Distance Transport of Subsurface Sediment‐Derived Iron From Asian to Alaskan Margins in the North Pacific Ocean |
| title_short | Long Distance Transport of Subsurface Sediment‐Derived Iron From Asian to Alaskan Margins in the North Pacific Ocean |
| title_sort | long distance transport of subsurface sediment derived iron from asian to alaskan margins in the north pacific ocean |
| topic | iron isotopes manganese radium particles GEOTRACES marine trace metals |
| url | https://doi.org/10.1029/2024GL110836 |
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