Long Distance Transport of Subsurface Sediment‐Derived Iron From Asian to Alaskan Margins in the North Pacific Ocean
Year: 2024
Type: article
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.
Source: Geophysical Research Letters
DOI: 10.1029/2024gl110836
Authors: 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
Institutions: University of South Florida, Massachusetts Institute of Technology, Texas A&M University, University of Southern California, University of California, Santa Cruz, University of Hawaiʻi at Mānoa, University of Hawaii System, Woods Hole Oceanographic Institution, University of South Carolina, University of Washington, Japan Agency for Marine-Earth Science and Technology
Language: English
Subfield: Oceanography
Field: Earth and Planetary Sciences
Domain: Physical Sciences
SDG: Life below water
Open Access status: gold
Estimated APC paid: $2,900
Awards: Graduate Research Fellowship Program (GRFP), Collaborative Research: US GEOTRACES PMT: Sources and Rates of Trace Element and Isotope Cycling Derived from the Radium Quartet, G3492147745, US GEOTRACES PMT: Shipboard determination of key dissolved trace elements, Collaborative Research: U.S. GEOTRACES PMT: Dissolved trace metal distributions and size partitioning, Collaborative research: US GEOTRACES PMT: Trace-metal concentrations and stable isotopes in the North Pacific, Support for International Ocean Science Activities Through SCOR, US GEOTRACES PMT: the geochemistry of size-fractionated suspended particles collected by in-situ filtration, G8409100786, Collaborative Research: US GEOTRACES PMT: Sources and Rates of Trace Element and Isotope Cycling Derived from the Radium Quartet, Collaborative research: US GEOTRACES PMT: Trace-metal concentrations and stable isotopes in the North Pacific, Collaborative Research: Management and Implementation of the US GEOTRACES Pacific Meridional Transect
OpenAlex ID: W4403396109