Bioavailable Iron in the Southern Ocean: The Significance of the Iceberg Conveyor Belt
Author Information
Author(s): Raiswell Rob, Benning Liane G, Tranter Martyn, Tulaczyk Slawek
Primary Institution: Earth and Biosphere Institute, School of Earth and Environment, University of Leeds
Hypothesis
Can glacial and iceberg-hosted sediments provide bioavailable iron to the Southern Ocean?
Conclusion
The study found that glacial and iceberg-hosted sediments contain reactive iron nanoparticles that can enhance productivity in the Southern Ocean.
Supporting Evidence
- Icebergs can transport iron-rich sediments away from coastal regions.
- Nano-sized iron particles are more reactive and bioavailable than larger particles.
- The flux of bioavailable iron from icebergs is comparable to that from aeolian dust.
- Melting icebergs can enhance primary productivity in the Southern Ocean.
Takeaway
Icebergs can carry tiny bits of iron from glaciers into the ocean, which helps tiny ocean plants grow.
Methodology
Sediment samples were collected from icebergs and glaciers, and nanoparticulate iron was extracted using a buffered ascorbate solution.
Limitations
The study primarily focused on specific locations and may not represent all areas of the Southern Ocean.
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website