Predicting the dry deposition of aerosol-sized particles using layer-resolved canopy and pipe flow analogy models: Role of turbophoresis

dc.contributor.author

Katul, GG

dc.contributor.author

Grönholm, T

dc.contributor.author

Launiainen, S

dc.contributor.author

Vesala, T

dc.date.accessioned

2011-06-21T17:32:24Z

dc.date.issued

2010-01-01

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 d+) are presented as a function of the normalized particle timescale (p+), where the normalizing variables are the friction velocity and air viscosity, a power law scaling in the form of V d+ ∼ (p+)2 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.description.version

Version of Record

dc.identifier.issn

0148-0227

dc.identifier.uri

https://hdl.handle.net/10161/4613

dc.language.iso

en_US

dc.publisher

American Geophysical Union (AGU)

dc.relation.ispartof

Journal of Geophysical Research Atmospheres

dc.relation.isversionof

10.1029/2009JD012853

dc.relation.journal

Journal of Geophysical Research-Atmospheres

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
dc.type

Journal article

duke.contributor.orcid

Katul, GG|0000-0001-9768-3693

duke.date.pubdate

2010-6-17

duke.description.issue
duke.description.volume

115

pubs.begin-page

D12202

pubs.issue

12

pubs.organisational-group

Civil and Environmental Engineering

pubs.organisational-group

Duke

pubs.organisational-group

Environmental Sciences and Policy

pubs.organisational-group

Nicholas School of the Environment

pubs.organisational-group

Pratt School of Engineering

pubs.publication-status

Published

pubs.volume

115

Files

Original bundle

Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
278987000004.pdf
Size:
402.18 KB
Format:
Adobe Portable Document Format