New, more precise calculations help re-create how the collision affected Earth’s climate
The asteroid collision that may have doomed the dinosaurs 66 million years ago really stank. A new analysis of gases released from vaporized rocks at the impact site in modern-day Mexico suggests that the smashup released up to three times more smelly, climate-cooling sulfur than previously believed.
The Chicxulub impact spewed about 325 billion tons of sulfur and 425 billion tons of carbon dioxide into the air, researchers report October 31 in Geophysical Research Letters.
This relatively modest release of CO₂ might have contributed to long-term planetary warming. But the massive cloud of sulfurous gas would have more immediately blocked out the sun, the researchers suggest, plunging the planet into a dark Narnia-style winter that was colder and longer than previously thought. That could help explain why so many of Earth’s plants and animals went extinct around this time, even those living nowhere near the impact crater (SN: 2/4/17, p. 16).