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Coastal El Niño triggers rapid marine silicate alteration on the seafloor

Author

Listed:
  • Sonja Geilert

    (GEOMAR Helmholtz Centre for Ocean Research Kiel)

  • Daniel A. Frick

    (Section Earth Surface Geochemistry)

  • Dieter Garbe-Schönberg

    (University of Kiel
    Jacobs University Bremen)

  • Florian Scholz

    (GEOMAR Helmholtz Centre for Ocean Research Kiel)

  • Stefan Sommer

    (GEOMAR Helmholtz Centre for Ocean Research Kiel)

  • Patricia Grasse

    (GEOMAR Helmholtz Centre for Ocean Research Kiel
    German Centre for Integrative Biodiversity Research (iDiv) Halle-Jena-Leipzig)

  • Christoph Vogt

    (University of Bremen)

  • Andrew W. Dale

    (GEOMAR Helmholtz Centre for Ocean Research Kiel)

Abstract

Marine silicate alteration plays a key role in the global carbon and cation cycles, although the timeframe of this process in response to extreme weather events is poorly understood. Here we investigate surface sediments across the Peruvian margin before and after extreme rainfall and runoff (coastal El Niño) using Ge/Si ratios and laser-ablated solid and pore fluid Si isotopes (δ30Si). Pore fluids following the rainfall show elevated Ge/Si ratios (2.87 µmol mol−1) and δ30Si values (3.72‰), which we relate to rapid authigenic clay formation from reactive terrigenous minerals delivered by continental runoff. This study highlights the direct coupling of terrestrial erosion and associated marine sedimentary processes. We show that marine silicate alteration can be rapid and highly dynamic in response to local weather conditions, with a potential impact on marine alkalinity and CO2-cycling on short timescales of weeks to months, and thus element turnover on human time scales.

Suggested Citation

  • Sonja Geilert & Daniel A. Frick & Dieter Garbe-Schönberg & Florian Scholz & Stefan Sommer & Patricia Grasse & Christoph Vogt & Andrew W. Dale, 2023. "Coastal El Niño triggers rapid marine silicate alteration on the seafloor," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-37186-5
    DOI: 10.1038/s41467-023-37186-5
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    References listed on IDEAS

    as
    1. Terry T. Isson & Noah J. Planavsky, 2018. "Reverse weathering as a long-term stabilizer of marine pH and planetary climate," Nature, Nature, vol. 560(7719), pages 471-475, August.
    2. Sonja Geilert & Patricia Grasse & Klaus Wallmann & Volker Liebetrau & Catriona D. Menzies, 2020. "Serpentine alteration as source of high dissolved silicon and elevated δ30Si values to the marine Si cycle," Nature Communications, Nature, vol. 11(1), pages 1-11, December.
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