Ozone perturbation from medium-size asteroid impacts in the ocean

Estimated water vapor in the upper atmosphere was then introduced in the initial conditions for the WACCM simulations that modeled the subsequent perturbation of atmospheric chemistry Final estimates of the change over time in UV flux at the surface due to the impact-induced ozone change are then carried out using the TUV radiative transfer model. The results suggest that mid-latitude oceanic impacts of 1 km asteroids can produce a significant, global perturbation of upper atmospheric chemistry, including multi-year global ozone depletion comparable to ozone hole records registered in the mid-1990 s.

Asteroids 500 m in diameter cause limited perturbations of upper atmospheric chemistry with significant ozone depletion confined to the hemisphere in which the impact occurred. Impact-induced ozone depletion affects UV irradiance at the Earth's surface, resulting in levels of UV-B irradiance that can be dangerous for living organisms, and, in the tropics and initial midlatitude summers, far exceed levels currently experienced anywhere on Earth.