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- W1678873602 abstract "We consider here two aspects of the fine ejecta generated by the KT bolide. First, cratering scaling laws are used to estimate the mass of ejecta particles in the size range 1 μm 10 mm with launch velocities consistent with ballistic trajectories, i.e., 5 11 km s-1. For a 10 km diameter asteroid, impacting at 20 km s-1, a global ejecta layer of 0.1 mm thickness is predicted, far less than the observed ejecta layer thickness of ~ 3 mm [5,6], indicating either a deficiency in the scaling laws or that a substantially (~ 30 times) more energetic impact occurred. Second, we evaluate the effect of near-infrared heating at the ground due to reentry of ballistic ejecta particles (consistent with a 3 mm ejecta layer) to determine whether this mechanism can produce global wildfires. The model includes heat conduction at the surface, and upward heat transport by atmospheric convection. For a 10 kW m-2 peak infrared flux at the ground [4], decaying with a timescale ~ 0.5 hour, the peak surface temperature predicted for a sand surface is 400 480 K, well below the wood ignition temperature of ~ 650 K [8], suggesting that fires were not ignited globally during ejecta reentry. The semi-empirical formalism of O'Keefe and Ahrens [1] is used to compute crater ejecta mass, fragment size, and fragment velocity for the K-T impact. For cratering in the gravity-regime, we assume the cratering efficiency is that of wet sand [2], with the total ejecta mass given by" @default.
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- W1678873602 date "1997-03-01" @default.
- W1678873602 modified "2023-09-27" @default.
- W1678873602 title "Global Effects of Impact Ejecta from the K-T Bolide" @default.
- W1678873602 hasPublicationYear "1997" @default.
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