Iron fertilization less efficient for deep-sea carbon dioxide storage than previously thought?

Ian Salter from the Alfred Wegener Institute and a team of international collaborators discovered that iron fertilization promotes the growth of shelled organisms. In a naturally iron-fertilized system in the Southern Ocean the growth and sinking of these phytoplankton grazers reduces CO2 deep-ocean storage by up to 30 percent. Ignoring this response could result in overestimating the marine CO2 storage capacity resulting from iron fertilization. The study is published by Nature Geoscience.

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