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How do oceans act as carbon reserviors, and what might happen if ocean absorption of co2 decreases In short
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How oceans act as carbon reservoirs
- Physical (solubility) pump: CO2 dissolves in surface water; cold water holds more CO2 and ocean circulation transports that CO2 into the deep ocean.
- Biological pump: Phytoplankton fix CO2 into organic matter; some sinks as particles to the deep ocean or is incorporated into shells and sediments.
- Carbonate chemistry and sediments: Dissolved CO2 is converted to bicarbonate/carbonate, and over long timescales carbon is stored in sediments and rocks.
What if ocean CO2 uptake decreases
- More CO2 stays in the atmosphere, accelerating global warming and its impacts (heatwaves, sea‑level rise, extreme weather).
- The global carbon sink weakens (positive feedback), making it harder and more expensive to meet climate targets.
- Marine impacts: changes in circulation and oxygenation, altered ecosystems and fisheries; acidification trends might change locally but overall climate-driven stress on oceans would increase.
In short: oceans currently buffer a lot of our CO2; if that buffering weakens, atmospheric CO2 and warming rise faster, with large climate and ecosystem consequences.
How oceans act as carbon reservoirs
- Physical (solubility) pump: CO2 dissolves in surface water; cold water holds more CO2 and ocean circulation transports that CO2 into the deep ocean.
- Biological pump: Phytoplankton fix CO2 into organic matter; some sinks as particles to the deep ocean or is incorporated into shells and sediments.
- Carbonate chemistry and sediments: Dissolved CO2 is converted to bicarbonate/carbonate, and over long timescales carbon is stored in sediments and rocks.
What if ocean CO2 uptake decreases
- More CO2 stays in the atmosphere, accelerating global warming and its impacts (heatwaves, sea‑level rise, extreme weather).
- The global carbon sink weakens (positive feedback), making it harder and more expensive to meet climate targets.
- Marine impacts: changes in circulation and oxygenation, altered ecosystems and fisheries; acidification trends might change locally but overall climate-driven stress on oceans would increase.
In short: oceans currently buffer a lot of our CO2; if that buffering weakens, atmospheric CO2 and warming rise faster, with large climate and ecosystem consequences.
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