
A CROZEX study in the sub-Antarctic Southern Ocean measured carbon sinking to three kilometres below the surface and found naturally iron-fertilised waters exported two to three times more carbon than adjacent nutrient-rich patches without the iron
The CROZEX cruise measured carbon sinking three kilometres beneath the sub-Antarctic Southern Ocean and found that naturally iron-fertilised waters exported roughly two to three times more carbon than adjacent iron-starved patches — a natural experiment that anchors modern debates over ocean iron fertilisation.















