Why ancient extinction patterns reveal a terrifying future for our rapidly acidifying oceans
In short: Sixty-five million years ago, ammonites vanished while nautilids survived an asteroid strike. New research suggests the culprit was ocean acidification. Today, our coastal waters are acidifying faster than models predicted, as natural upwelling cycles collide with rising atmospheric carbon, threatening the marine ecosystems and fisheries we depend on.
The extinction of ammonites 65 million years ago serves as a stark warning about the unpredictability of mass extinction events. While both ammonites and nautilids were successful mollusks, the former proved uniquely vulnerable to the shifting chemistry of the oceans following an asteroid impact. This historical lesson highlights that when environments undergo rapid transformation, the distinction between resilient survivors and those destined for collapse is often difficult to foresee. As modern oceans warm and acidify, we face a similar uncertainty regarding which diverse organisms will adapt and which will perish.
Recent findings published in Nature Communications on November 13th reveal that coastal acidification is accelerating more rapidly than atmospheric CO2 levels alone would suggest. By studying the California Current, researchers discovered that upwelling systems—where deep, nutrient-rich, and naturally acidic waters rise to the surface—significantly intensify the acidification process. Microbes in the deep ocean break down sinking organic matter, releasing CO2 that accumulates in these depths. When this water reaches the surface, it combines with human-driven atmospheric CO2, creating a compounded effect that pushes pH levels down faster than anticipated.
To reconstruct these changes, scientists analyzed boron isotope signatures preserved in historic coral skeletons, providing a record of coastal acidity throughout the 20th century. Using regional ocean models, the team projected that this trend will continue through the 21st century. This phenomenon is not limited to California; major upwelling systems like the Humboldt, Benguela, and Canary Currents face similar risks. Because these regions are among the most biologically productive on Earth, the rapid drop in pH poses a significant threat to global fisheries and the coastal economies that rely on them. Experts emphasize that mitigating climate change through technologies like electric vehicles and heat pumps is essential to curbing this ocean-wide crisis.
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Sources
- Summary by Intellect · source: Science Bulletins: Sea Creatures Face the Acid Test
- Also: Scientists find coastal seas acidifying shockingly fast
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