Haszpra, Tímea and Tél, Tamás (2013) Escape rate : A Lagrangian measure of particle deposition from the atmosphere. NONLINEAR PROCESSES IN GEOPHYSICS, 20 (5). pp. 867881. ISSN 10235809

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Abstract
Due to rising or descending air and due to gravity, aerosol particles carry out a complicated, chaotic motion and move downwards on average. We simulate the motion of aerosol particles with an atmospheric dispersion model called the Real Particle Lagrangian Trajectory (RePLaT) model, i.e., by solving Newton's equation and by taking into account the impacts of precipitation and turbulent diffusion where necessary, particularly in the planetary boundary layer. Particles reaching the surface are considered to have escaped from the atmosphere. The number of nonescaped particles decreases with time. The shortterm and longterm decay are found to be exponential and are characterized by escape rates. The reciprocal values of the shortterm and longterm escape rates provide estimates of the average residence time of typical particles, and of exceptional ones that become convected or remain in the free atmosphere for an extremely long time, respectively. The escape rates of particles of different sizes are determined and found to vary in a broad range. The increase is roughly exponential with the particle size. These investigations provide a Lagrangian foundation for the concept of deposition rates.
Item Type:  Article 

Subjects:  Q Science / természettudomány > QC Physics / fizika 
SWORD Depositor:  MTMT SWORD 
Depositing User:  MTMT SWORD 
Date Deposited:  30 Apr 2014 11:53 
Last Modified:  30 Apr 2014 13:42 
URI:  http://real.mtak.hu/id/eprint/11578 
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