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- W4385690003 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> The trace metal iron (Fe) is an essential micronutrient that controls phytoplankton productivity, which subsequently affects the cycling of macronutrients. Along the continental margin of the U.S. West Coast, high benthic Fe release has been documented, in particular from deep anoxic basins in the Southern California Borderland. However, the influence of this Fe release on surface primary production remains poorly understood. In the present study from the Santa Barbara Basin, in-situ benthic Fe fluxes were determined along a transect from shallow to deep sites in the basin. Fluxes ranged between 0.23 and 4.9 mmol m<sup>-2</sup> d<sup>-1</sup>, representing some of the highest benthic Fe fluxes reported to date. To investigate the influence of benthic Fe release from the oxygen-deficient deep basin on surface phytoplankton production, we combined benthic flux measurements with numerical simulations using the Regional Ocean Model System coupled to the Biogeochemical Elemental Cycling model (ROMS-BEC). For this purpose, we updated existing Fe flux parameterization to include new benthic fluxes from the Santa Barbara Basin. Our simulation suggests benthic iron fluxes support surface primary production creating positive feedback on benthic Fe release by enhancing low oxygen conditions in bottom waters. However, the easing of phytoplankton Fe limitation near the coast may be partially compensated by increased nitrogen limitation further offshore, reducing the efficacy of this positive feedback." @default.
- W4385690003 created "2023-08-10" @default.
- W4385690003 creator A5089651837 @default.
- W4385690003 date "2023-08-10" @default.
- W4385690003 modified "2023-10-02" @default.
- W4385690003 title "Reply on RC2" @default.
- W4385690003 doi "https://doi.org/10.5194/bg-2022-237-ac3" @default.
- W4385690003 hasPublicationYear "2023" @default.
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