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The Carbon Cycle01:14

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Ocean acidification: the other CO2 problem.

Scott C Doney1, Victoria J Fabry, Richard A Feely

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Annual Review of Marine Science
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Ocean acidification, driven by rising carbon dioxide (CO2), alters seawater chemistry, impacting marine life. Research is needed to understand organism adaptation and ecosystem effects.

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Area of Science:

  • Marine Biology
  • Oceanography
  • Environmental Chemistry

Background:

  • Rising atmospheric carbon dioxide (CO2) from human activities is increasing ocean acidity.
  • Ocean acidification alters seawater chemistry, affecting marine ecosystems globally.
  • The rate of ocean acidification is projected to accelerate this century.

Purpose of the Study:

  • To document the effects of ocean acidification on marine organisms.
  • To investigate the impact of changing seawater chemistry on biogeochemical cycles.
  • To highlight research priorities concerning marine organism adaptation to CO2.

Main Methods:

  • Analysis of field data on ocean acidification.
  • Laboratory experiments on calcifying organisms under high-CO2 conditions.
  • Review of existing research on ocean acidification impacts.

Main Results:

  • Ocean acidification lowers calcium carbonate saturation states, affecting shell-forming organisms.
  • Calcifying species show reduced calcification and growth rates in laboratory settings.
  • Some photosynthetic organisms exhibit increased carbon fixation rates.

Conclusions:

  • Ocean acidification poses significant risks to marine calcifiers and ecosystems.
  • The capacity of marine organisms to adapt to increasing CO2 is largely unknown.
  • Further research is crucial to predict and mitigate the effects of ocean acidification.