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Biogel scavenging slows the sinking of organic particles to the ocean depths

Author

Listed:
  • Uria Alcolombri

    (The Hebrew University of Jerusalem)

  • Alon Nissan

    (Food and Environment. Department of Soil and Water Sciences. The Hebrew University of Jerusalem)

  • Jonasz Słomka

    (ETH Zurich)

  • Sam Charlton

    (ETH Zurich)

  • Eleonora Secchi

    (ETH Zurich)

  • Isobel Short

    (ETH Zurich)

  • Kang Soo Lee

    (Ulsan National Institute of Science and Technology (UNIST))

  • François J. Peaudecerf

    (IPR (Institut de Physique de Rennes) - UMR 6251)

  • Dieter A. Baumgartner

    (ETH Zurich)

  • Andreas Sichert

    (ETH Zurich)

  • Uwe Sauer

    (ETH Zurich)

  • Anupam Sengupta

    (University of Luxembourg
    University of Luxembourg)

  • Roman Stocker

    (ETH Zurich)

Abstract

One of Earth’s largest carbon fluxes is driven by particles made from photosynthetically fixed matter, which aggregate and sink into the deep ocean. While biodegradation is known to reduce this vertical flux, the biophysical processes that control particle sinking speed are not well understood. Here, we use a vertical millifluidic column to video-track single particles and find that biogels scavenged by particles during sinking significantly reduce the particles’ sinking speed, slowing them by up to 45% within one day. Combining observations with a mathematical model, we determine that the mechanism for this slowdown is a combination of increased drag due to the formation of biogel tendrils and increased buoyancy due to the biogel’s low density. Because biogels are pervasive in the ocean, we propose that by slowing the sinking of organic particles they attenuate the vertical carbon flux in the ocean.

Suggested Citation

  • Uria Alcolombri & Alon Nissan & Jonasz Słomka & Sam Charlton & Eleonora Secchi & Isobel Short & Kang Soo Lee & François J. Peaudecerf & Dieter A. Baumgartner & Andreas Sichert & Uwe Sauer & Anupam Sen, 2025. "Biogel scavenging slows the sinking of organic particles to the ocean depths," Nature Communications, Nature, vol. 16(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-57982-5
    DOI: 10.1038/s41467-025-57982-5
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