Senel Study Finds Asteroid Dust Cooled Earth 15 Degrees for 15 Years
Updated
Updated · spacedaily.com · Jun 3
Senel Study Finds Asteroid Dust Cooled Earth 15 Degrees for 15 Years
1 articles · Updated · spacedaily.com · Jun 3
Summary
Fine silicate dust from the Chicxulub impact may have stayed aloft for up to 15 years, driving surface cooling of about 15 degrees, according to 2023 palaeoclimate simulations led by Cem Berk Senel.
Grain-size measurements from the Tanis K-Pg deposit in North Dakota pointed to more 0.8-to-8-micrometre dust than earlier estimates, and the model says that dust helped keep photosynthesis near a standstill for almost two years.
The study does not treat dust as the sole killer: it says dust acted alongside sulfur aerosols and soot after the 10-to-12-kilometre asteroid struck the Yucatán 66 million years ago.
That longer atmospheric shutdown fits extinction patterns better than blast damage alone, helping explain how an impact centered near the Gulf of Mexico wiped out roughly three-quarters of species worldwide.
If fine dust was the real killer, are we underestimating the danger of atmospheric particles in our climate today?
How did life survive on a planet plunged into total darkness and cold for nearly two years?
The Chicxulub Impact Winter: New Evidence Reveals Fine Dust as the Main Driver of Dinosaur Extinction
Overview
Recent research has transformed our understanding of the dinosaur extinction event 66 million years ago. While the Chicxulub asteroid impact was long known to have wiped out 75% of Earth's species, new studies published in late 2023 revealed that fine silicate dust, generated and ejected high into the atmosphere by the impact, played a dominant role. This dust blocked sunlight for years, causing a dramatic drop in global temperatures and a collapse of photosynthesis, which devastated ecosystems. The findings highlight how this prolonged 'impact winter'—rather than just immediate effects—was key to the mass extinction.