Nucleation Scavenging of Smoke Particles and Simulated Drop Size Distributions over Large Biomass Fires

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Abstract
A prescribed burn experiment was conducted in Hardiman Township, Ontario, Canada in August 1987. The fire was of adequate intensity to force the formation of a cumulus cloud, and much of the smoke passed through this cloud. The smoke plume and the fire-driven cloud were observed using ground- and aircraft-based instrumentation. In this paper, we present calculations of the evolution of the smoke and drop size distributions within this cloud due to nucleation and condensation from a detailed microphysical entraining model. Initial conditions for the model simulations were specified using a three-dimensional warm-cloud dynamical model. We investigate the changes of parcel characteristics caused by the effect of entrainment, as well as the sensitivity of nucleation scavenging and drop number concentration to the different background environmental aerosol distributions. The fraction of smoke particles nucleated depends on the chemical nature of the particles, their size distribution, the quantity of ... Abstract A prescribed burn experiment was conducted in Hardiman Township, Ontario, Canada in August 1987. The fire was of adequate intensity to force the formation of a cumulus cloud, and much of the smoke passed through this cloud. The smoke plume and the fire-driven cloud were observed using ground- and aircraft-based instrumentation. In this paper, we present calculations of the evolution of the smoke and drop size distributions within this cloud due to nucleation and condensation from a detailed microphysical entraining model. Initial conditions for the model simulations were specified using a three-dimensional warm-cloud dynamical model. We investigate the changes of parcel characteristics caused by the effect of entrainment, as well as the sensitivity of nucleation scavenging and drop number concentration to the different background environmental aerosol distributions. The fraction of smoke particles nucleated depends on the chemical nature of the particles, their size distribution, the quantity of ...

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