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Study Links Ocean Stratification to Historic CO2 Levels

10/10/2025

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Summary

Story summary

Researchers, led by Dr. Huang, studied Earth's climate during "lukewarm interglacials" from 800,000 to 430,000 years ago.
They analyzed ferromanganese crust from Haxby Seamount, finding that lower carbon dioxide levels resulted from a more stratified Southern Ocean.
This stratification limited vertical mixing, trapping carbon in deep waters and reducing atmospheric CO2 by 30-40 parts per million.
The findings highlight the link between ocean structure and climate, informing current global warming models and carbon management strategies.

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Story summary

Researchers, led by Dr. Huang, studied Earth's climate during "lukewarm interglacials" from 800,000 to 430,000 years ago.
They analyzed ferromanganese crust from Haxby Seamount, finding that lower carbon dioxide levels resulted from a more stratified Southern Ocean.
This stratification limited vertical mixing, trapping carbon in deep waters and reducing atmospheric CO2 by 30-40 parts per million.
The findings highlight the link between ocean structure and climate, informing current global warming models and carbon management strategies.