Growth of aerosols in Titan's atmosphere and related time scales - A stochastic approach

Details Growth of aerosols in Titan's atmosphere and related time scales - A stochastic approach Growth of aerosols in Titan's atmosphere and related time scales - A stochastic approach

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..967r&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 10, p. 967-970.

Physics

18

Aerosols, Particle Size Distribution, Satellite Atmospheres, Stochastic Processes, Titan, Satellite Surfaces, Time Dependence, Saturn, Satellites, Titan, Aerosols, Atmosphere, Timescale, Altitude, Simulation, Particles, Model, Collisions, Aggregates, Evolution, Size, Calculations, Parameters

Scientific paper

The evolution of Titan's aerosols is studied from their production altitude down to the ground using a stochastic approach. A background aerosol distribution is assumed, obtained from previous Eulerian modelling. and the evolution of a 'tagged' particle, released near the formation altitude, is followed by simulating in a random way its growth through coagulation with particles of the background distribution. The two distinct growth stages proposed by Cabane et al. (1992) to explain the formation of monomers and subsequent aggregates are confirmed. The first stage may be divided into two parts. First, within roughly one terrestrial day, particles grow mainly through collisions with larger particles. They reach the size of monomer through typically one to five such collisions. Second, within a few terrestrial days to roughly one terrestrial month, particles evolve mainly by collisions with continuously created small particles and acquire their compact spherical structure. In the second stage, whose duration is roughly 30 terrestrial years, or one Titan's seasonal cycle, particles grow by cluster-cluster aggregation during their fall through the atmosphere and reach, at low stratospheric levels, a typical radius of 0.4-0.5 micron.

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