Brief
Simulations suggest Southern Ocean could flip from carbon sink to carbon source
A study published in Science Advances finds that climate simulations suggest the Southern Ocean around Antarctica may switch from an important carbon sink to a prolific source of carbon as CO2 levels are reduced.
Plans to limit the global temperature rise to 1.5°C above preindustrial levels depend on reaching net-zero emissions and, in many cases, actively removing CO2 from the air. A new study, published in Science Advances, finds that reducing CO2 levels may have an unexpected effect.
Climate simulations used in the study suggest the Southern Ocean around Antarctica may switch from being an important carbon sink to being a prolific source of carbon. The result comes from models rather than from observations of the ocean itself.
The work points to a possible trade-off in mitigation: cutting emissions and pulling CO2 from the air could change how the Southern Ocean exchanges carbon with the atmosphere.
Our reading
Our reading is that this is a model-based signal about a possible side effect of mitigation, not a confirmed real-world shift.
What to do or watch
Watch for observational studies of the Southern Ocean, since the flip from carbon sink to carbon source described here comes from climate simulations rather than measurements of the ocean itself. The unresolved question is whether this mitigation trade-off would actually appear in the real ocean.
Source details and supporting facts
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Stated by phys.org
- A new study, published in Science Advances, finds that reducing CO2 levels may have an unexpected effect.
- Climate simulations used in the study suggest the Southern Ocean around Antarctica may switch from being an important carbon sink to being a prolific source of carbon.
- Plans to limit the global temperature rise to 1.5°C above preindustrial levels depend on reaching net-zero emissions and, in many cases, actively removing CO2 from the air.
Sources
- Phys.orgText stored 13 September 2026
How this story was checked. Written from the 1 page listed above, stored 13 September 2026; claims checked against that stored text on 14 September 2026.
What that means
- 3 of 3 reported statements were confirmed against the page that carries them; the rest were removed rather than published.
- Figures in the text were required to appear in the stored source text: yes. Identifiers: yes.
- The check reads stored text only: no claim rests on a fresh look that did not happen.
- Where the reporting was silent, the text says so instead of filling the gap.