Ocean Acidification
Ocean acidification refers to the ongoing decrease in the pH of Earth's oceans, caused primarily by the absorption of excess carbon dioxide (CO₂) from the atmosphere. As CO₂ dissolves in seawater, it forms carbonic acid, which lowers the water's pH and reduces carbonate ions essential for marine life. This process threatens coral reefs, shellfish, and other organisms, disrupting marine ecosystems and food chains.
Ocean Acidification
Ocean acidification refers to the ongoing decrease in the pH of Earth's oceans, caused primarily by the absorption of excess carbon dioxide (CO₂) from the atmosphere. As CO₂ dissolves in seawater, it forms carbonic acid, which lowers the water's pH and reduces carbonate ions essential for marine life. This process threatens coral reefs, shellfish, and other organisms, disrupting marine ecosystems and food chains.
💡 Key Takeaways
- Understand what ocean acidification is and how rising CO2 lowers seawater pH
- Learn how lower pH reduces carbonate availability and harms shell-forming organisms like corals and mollusks
- Explore the ripple effects on marine ecosystems, biodiversity, fisheries, and coastal communities
- Identify basic monitoring tools and mitigation ideas, including emissions reductions and protecting resilient habitats
❓ Frequently Asked Questions
What is ocean acidification?
Ocean acidification is the ongoing decrease in seawater pH caused by absorbing atmospheric CO2, which forms carbonic acid and reduces carbonate ions needed for shell-building.
What causes ocean acidification?
Rising atmospheric CO2 from burning fossil fuels dissolves in seawater, forming carbonic acid and releasing hydrogen ions that lower pH and carbonate availability.
How does acidification affect marine life?
Lower carbonate ion levels make it harder for calcifying organisms like corals, mollusks, and some plankton to build shells and skeletons, impacting ecosystems.
What is aragonite saturation and why does it matter?
Aragonite saturation (Ω_arag) indicates how easily shells can form; when Ω_arag falls below 1, calcification slows and shells can become weaker.
How can we address ocean acidification?
The primary solution is reducing CO2 emissions; improved energy choices and carbon management can help, while protecting ecosystems supports resilience.