Nucleation driven by time dependent diffusive heat and mass transfer

Ford, Ian; Barrett, Jonathan; Mclean, Michael
August 2000
AIP Conference Proceedings;2000, Vol. 534 Issue 1, p241
Academic Journal
Nucleation of fresh aerosol particles in the atmosphere is driven by the prevailing vapour supersaturation and temperature, which often vary with time. We consider the diffusion of heat and vapour into a parcel of gas and the resulting potential for particle nucleation. We focus on the case where a nucleation burst occurs which is self-terminated by the condensation of vapour onto the particles created. Simple consideration of the timescales for the increase and decrease of the nucleation rate at various points within the parcel is sufficient to characterise the productivity of the burst, in agreement with more elaborate numerical simulations.


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