Articles | Volume 19, issue 6
https://doi.org/10.5194/tc-19-2247-2025
https://doi.org/10.5194/tc-19-2247-2025
Research article
 | 
26 Jun 2025
Research article |  | 26 Jun 2025

Antarctic subglacial trace metal mobility linked to climate change across termination III

Gavin Piccione, Terrence Blackburn, Paul Northrup, Slawek Tulaczyk, and Troy Rasbury

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Short summary
Growth of microorganisms in the Southern Ocean is limited by low iron levels. Iron delivered from beneath the Antarctic Ice Sheet is one agent that fertilizes these ecosystems, but it is unclear how this nutrient source changes through time. Here, we measured the age and chemistry of a rock that records the iron concentration of Antarctic basal water. We show that increased dissolution of iron from rocks below the ice sheet can substantially enhance iron discharge during cold climate periods.
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