Science Seminars

Impacts of Cosmic Dust in Planetary Atmospheres

Speaker: John M. C. Plane (University of Leeds)
Date: Thursday, Aug 09, 2018
Time: 4:00 PM
Location: SPSC W120

Seminar Abstract:

Recent advances in interplanetary dust modelling provide much improved estimates of the fluxes of cosmic dust particles into planetary atmospheres throughout the solar system. Combining the dust particle size and velocity distributions with a chemical ablation model enables the injection rates of individual elements to be predicted as a function of location and time. This information is essential for understanding a variety of atmospheric impacts, including: the formation of layers of metal atoms and ions; meteoric smoke particles and ice cloud nucleation; perturbations to atmospheric gas-phase chemistry; and the effects of the surface deposition of bioavailable iron and organics in micrometeorites. There will be a discussion of impacts on all the planets, as well as on Pluto, Triton and Titan.