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| Titel |
Escape rate: a Lagrangian measure of particle deposition from the atmosphere |
| VerfasserIn |
T. Haszpra, T. Tél |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 20, no. 5 ; Nr. 20, no. 5 (2013-10-29), S.867-881 |
| Datensatznummer |
250086062
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| Publikation (Nr.) |
 copernicus.org/npg-20-867-2013.pdf |
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| Zusammenfassung |
| 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 non-escaped particles decreases with time. The
short-term and long-term decay are found to be exponential and are
characterized by escape rates. The reciprocal values of the short-term and
long-term 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. |
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