The end-Permian extinction event, also known as the Great Dying, occurred 250 million years ago and is considered the worst mass extinction in history. Recent research suggests that this catastrophic event may have been amplified by mega El Niño events that were far stronger and longer-lasting than those experienced today.
According to Alexander Farnsworth from the University of Bristol, these mega El Niños caused extreme climate fluctuations that led to the widespread death of forests and land animals. The research indicates that these El Niño events triggered feedback processes that exacerbated the mass extinction, resulting in the loss of around 90% of all species living at the time.
While massive volcanic eruptions in Siberia are believed to have initiated the end-Permian extinction by releasing high levels of carbon dioxide into the atmosphere, the early extinction of land species remains unexplained. Recent studies suggest that extreme El Niños may have played a significant role in this phenomenon.
Farnsworth and his team conducted computer simulations to explore the impact of El Niño events at the end of the Permian Period. They found that as carbon dioxide levels increased, these events became more intense and prolonged, causing significant climate disruptions on land. This, in turn, led to the death of forests, which stopped absorbing CO2 and began releasing it, further exacerbating global warming.
The study suggests that by the peak of the extinction, El Niño events were causing temperature anomalies of up to 4°C, lasting over a decade each. While the future implications of such events remain uncertain, the researchers emphasize that El Niños are already having a more significant impact in today’s warmer world.
Pedro DiNezio from the University of Colorado, Boulder, acknowledges the study’s importance in understanding past climate conditions but notes that mega El Niños like those during the end-Permian extinction are unlikely to occur today due to the smaller size of the Pacific Ocean compared to Panthalassa.
Overall, the research sheds light on the complex interactions that contributed to the end-Permian mass extinction, highlighting the importance of considering multiple factors, including El Niño events, in understanding past extinction events. As we continue to study these ancient catastrophes, we gain valuable insights into how various environmental changes can interact and cascade through the Earth’s ecosystems.
