Home News A solution to hypercapnia? A new study suggests fertilizing the ocean

A solution to hypercapnia? A new study suggests fertilizing the ocean

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Seeding the oceans with nano-fertilizers could create a big, much-needed carbon sink. Credit: Illustration by Stephanie King | Pacific Northwest National Laboratory

Iron-based fertilizers in the form of nanoparticles have the potential to store excess carbon dioxide in the ocean.

An international team of researchers led by Michael Hochella of the Pacific Northwest National Laboratory has suggested that using microorganisms could be a solution to meet the urgent need to remove excess carbon dioxide from the terrestrial environment.

The team conducted an analysis published in the journal Nature’s nanotechnologyOn the possibility of sowing seeds for the oceans with synthetic iron-rich fertilizer particles near ocean plankton, microscopic plants essential to the ocean ecosystem, to enhance the growth and uptake of carbon dioxide by phytoplankton.

“The idea is to augment existing processes,” said Hoshila, a researcher at the Pacific Northwest National Laboratory. Humans have been fertilizing the land to grow crops for centuries. We can learn to fertilize the oceans responsibly. »

Michael Hochela is an internationally recognized environmental geochemist. Credit: Virginia Tech Photographic Services

In nature, nutrients from land reach the oceans through rivers and blow up dust to fertilize plankton. The research team suggests taking this natural process one step further to help remove excess carbon dioxide from the ocean. They studied evidence that adding specific combinations of carefully designed materials can effectively fertilize the oceans, encouraging phytoplankton to act as a carbon sink. Living organisms will absorb carbon in large quantities. Then, when they die, they sink to the depths of the ocean, bringing the excess carbon with them. Scientists say this proposed fertilization would simply speed up a natural process that is already safely sequestering carbon in a form that could remove it from the atmosphere for thousands of years.

“At this point, time is running out,” Hochela said. To combat rising temperatures, we need to reduce carbon dioxide levels globally. Considering all of our options, including using the oceans as a carbon dioxide sink gives us the best chance of cooling the planet. »

Extract ideas from literature

In their analysis, the researchers argued that engineered nanoparticles offer several attractive properties. Highly controllable and specifically designed for various ocean environments. Surface coatings can help particles stick to plankton. Some particles also have light-absorbing properties, allowing plankton to take in and use more carbon dioxide. The general approach can also be adapted to meet the needs of specific ocean environments. For example, one area might benefit more from iron-based particles, while silicon-based particles might be more effective in others, they say.

The researchers’ analysis of 123 published studies showed that several non-toxic mineral oxidants can safely promote plankton growth. They argue that the stability, abundance of land, and ease of creation of these materials make them viable options as plankton fertilizer.

The team also analyzed the cost of creating and distributing different molecules. Although the process is much more expensive than adding non-technical materials, it will also be more efficient.

Reference: “Potential Use of Engineered Nanoparticles in Ocean Fertilization for Large-Scale Removal of Atmospheric Carbon Dioxide” by Peyman Babakhani, Tanapon Vinrat, Muhammad Balusha, Colaba Suratana, Carolyn L. Peacock, and Benjamin S. 2022 Nov. 28, Available here. Nature’s nanotechnology.
DOI: 10.1038/s41565-022-01226-w

In addition to Hochella, the team included researchers from England, Thailand, and several US-based research institutes. The study was funded by the European Research Council under the European Union’s Research and Innovation Program Horizon 2020.


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