Show simple item record Katul, GG Grönholm, T Launiainen, S Vesala, T 2011-06-21T17:32:24Z 2010-01-01
dc.identifier.citation Journal of Geophysical Research Atmospheres, 2010, 115 (12)
dc.identifier.issn 0148-0227
dc.description.abstract A number of synthesis activities, mathematical modeling, and experiments on dry deposition of aerosol-sized particles over forested surfaces point to three disjointed findings: (1) deposition velocities measured over tall forests do not support a clearly defined minimum for particle sizes in the range of 0.1-2 m; (2) when measurements of the normalized deposition velocity (V <inf>d</inf><sup>+</sup>) are presented as a function of the normalized particle timescale (<inf>p</inf><sup>+</sup>), where the normalizing variables are the friction velocity and air viscosity, a power law scaling in the form of V <inf>d</inf><sup>+</sup> ∼ (<inf>p</inf><sup>+</sup>)<sup>2</sup> emerges in the so-called inertial-impaction regime for many laboratory and crop experiments, but none of the forest measurements fall on this apparent scaling law; and (3) two recent models with entirely different assumptions about the representation of the particle deposition process reproduce common data sets for forests. We show that turbophoresis, when accounted for at the leaf scale in vertically resolved or multilayer models (MLMs), provides a coherent explanation for the first two findings and sheds light on the third. The MLM resolves the canopy vertical structure and its effects on both the flow statistics and the leaf particle collection mechanisms. The proposed MLM predictions agree with a recent two-level particle-resolving data set collected over 1 year duration for a Scots pine stand in Hyytil (southern Finland). Such an approach can readily proportion the particle deposition onto foliage and forest floor and can take advantage of recent advances in measurements of canopy structural properties derived from remote sensing platforms. Copyright 2010 by the American Geophysical Union.
dc.language.iso en_US en_US
dc.relation.ispartof Journal of Geophysical Research Atmospheres
dc.relation.isversionof 10.1029/2009JD012853
dc.title Predicting the dry deposition of aerosol-sized particles using layer-resolved canopy and pipe flow analogy models: Role of turbophoresis
dc.title.alternative en_US
dc.type Journal Article
dc.description.version Version of Record en_US 2010-6-17 en_US
duke.description.endpage D12202 en_US
duke.description.issue en_US
duke.description.startpage D12202 en_US
duke.description.volume 115 en_US
dc.relation.journal Journal of Geophysical Research-Atmospheres en_US
pubs.issue 12
pubs.organisational-group /Duke
pubs.organisational-group /Duke/Nicholas School of the Environment
pubs.organisational-group /Duke/Nicholas School of the Environment/Environmental Sciences and Policy
pubs.organisational-group /Duke/Pratt School of Engineering
pubs.organisational-group /Duke/Pratt School of Engineering/Civil and Environmental Engineering
pubs.publication-status Published
pubs.volume 115

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