Universität zu Köln

Zhang, J. and Shao, Y. (2014). A new parameterization of particle dry deposition over rough surfaces. Atmos. Chem. Phys., 14 (22). S. 12429 - 12441. GOTTINGEN: COPERNICUS GESELLSCHAFT MBH. ISSN 1680-7324

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Abstract

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.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Zhang, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Shao, Y. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-449037
DOI:	10.5194/acp-14-12429-2014
Journal or Publication Title:	Atmos. Chem. Phys.
Volume:	14
Number:	22
Page Range:	S. 12429 - 12441
Date:	2014
Publisher:	COPERNICUS GESELLSCHAFT MBH
Place of Publication:	GOTTINGEN
ISSN:	1680-7324
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DRAG PARTITION; VEGETATIVE CANOPIES; TRANSPORT; SCHEME; SIZE; PREDICTIONS Multiple languages Environmental Sciences; Meteorology & Atmospheric Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/44903