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| Titel |
A new parameterization of particle dry deposition over rough surfaces |
| VerfasserIn |
J. Zhang, Y. Shao |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 22 ; Nr. 14, no. 22 (2014-11-27), S.12429-12440 |
| Datensatznummer |
250119188
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| Publikation (Nr.) |
 copernicus.org/acp-14-12429-2014.pdf |
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| Zusammenfassung |
| In existing particle dry deposition schemes, the effects
of gravity and surface roughness elements on particle motion are often
poorly represented. In this study, we propose a new scheme to overcome such
deficiencies. Particle deposition velocity is a function of aerodynamic,
surface-collection and gravitational resistances. In this study, the effect
of gravitation settling is treated analytically. More importantly, the new
scheme takes into consideration the impacts of roughness elements on
turbulent particle diffusion and surface particle collection. A relationship
between aerodynamic and surface-collection processes is established by using
an analogy between drag partition and deposition-flux partition. The scheme
is then tested against a wind-tunnel data set for four different surfaces
and a good agreement between the scheme predictions and the observations is
found. The sensitivity of the scheme to the input parameters is tested.
Important factors which affect particle deposition in different particle
size ranges are identified. The scheme shows good capacity for modeling
particle deposition over rough surfaces. |
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