Measurements of dust deposition velocity in a wind-tunnel experiment

Zhang, Jie; Shao, Yaping; Huang, Ning

doi:10.5194/acp-14-8869-2014

Cited by 52 publications

(41 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In particle deposition schemes, the typical size of the surface collectors is often the only parameter used to for the characterization of the surface, which is insufficient for rough surfaces. The deficiencies of the existing particle deposition schemes are clearly revealed in our recent comparison of the Slinn and Slinn (1980, SS80 hereafter), Slinn (1982, S82 hereafter), Zhang et al (2001, Z01 hereafter) and Petroff and Zhang (2010, PZ10 hereafter) with the wind-tunnel observations, as described in the companion paper by Zhang et al (2014). The results of the latter study are summarized in Fig.…”

Section: Introductionsupporting

confidence: 48%

“…Slinn (1982) considered that in addition to the size of the roughness element, the micro roughness characteristics (i.e., the characteristics of the roughness element surface, e.g., hair on plant leaves) are also important for interception. Our wind-tunnel study (Zhang et al, 2014) shows E in is also enhanced by friction velocity, u * . In summary, it is appropriate to propose that…”

Section: Surface Collection Resistancementioning

confidence: 99%

“…The term B 1 · Sc T is set to 0.6 for SS80 and 1 for Zhang et al (2001). In this study, the value of B 1 is estimated to be 0.45, based on the wind-tunnel measurements of Zhang et al (2014).…”

Section: Aerodynamic Resistancementioning

confidence: 99%

“…For validation, we test the new scheme for four different surfaces studied in the wind-tunnel experiment of Zhang et al (2014). The values of relevant parameters are listed in Table 3.…”

Section: Validationmentioning

confidence: 99%

“…The effects of gravitational settling and surface collectors over a rough surface are now adequately dealt with. Finally, the new scheme is validated by the measurements of the wind-tunnel experiments as described in Zhang et al (2014). 2 Parameterization scheme for particle deposition…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A new parameterization of particle dry deposition over rough surfaces

Zhang

Shao

2014

Atmos. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

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, surfacecollection 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 depositionflux partition. The scheme is then tested against a windtunnel 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.

show abstract

Section: Introductionsupporting

confidence: 48%

Section: Surface Collection Resistancementioning

confidence: 99%

Section: Aerodynamic Resistancementioning

confidence: 99%

“…For validation, we test the new scheme for four different surfaces studied in the wind-tunnel experiment of Zhang et al (2014). The values of relevant parameters are listed in Table 3.…”

Section: Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A new parameterization of particle dry deposition over rough surfaces

Zhang

Shao

2014

Atmos. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

Near‐surface dust flux enrichment in small particles during erosion events

Dupont

Alfaro

Bergametti

et al. 2015

Geophysical Research Letters

View full text Add to dashboard Cite

Mineral dust in the atmosphere impacts Earth's radiative budget and biogeochemical cycles. Sorting of dust‐sized particles within the first few meters above the soil during wind erosion is still unknown. In particular, the sensitivity of the size distribution of dust flux to wind intensity has been questioned for years. This sensitivity is reanalyzed here using a novel erosion model developed in a turbulent airflow model. Starting from air free of dust, the suspension of small dust (1.5μm) needs several hours to reach a stationary state against about 20 min for coarser dust (> 5μm). During this nonstationary phase, a continuous enrichment of the near‐surface dust flux in small particles is simulated, enrichment enhanced with wind intensity. This is explained by the lower deposition velocity of small dust particles, a process usually ignored in interpretation of field data but that plays a crucial role in sorting dust particles.

show abstract

Dry deposition of particles to canopies—A look back and the road forward

Hicks¹,

Saylor

Baker

2016

JGR Atmospheres

View full text Add to dashboard Cite

The so‐called accumulation‐size range of airborne particles is the center of a continuing disagreement about the formulation of dry deposition. Some contemporary meteorological and air quality models use theoretical developments based on early wind tunnel and other controlled experiments, while other models consider the bulk properties of the underlying surface and the ability of atmospheric turbulence to deliver particles to it. This dichotomy arose when the first micrometeorological measurements of particle deposition velocities became available, yielding numbers exceeding the highest expectations of the then‐current models based on assumptions about inertial impaction and interception. The model predictions had previously been shown to be in accord with theoretical treatments of filtration. A common reaction was to distrust the field experimental results, but the experimental findings were supported by subsequent studies. The difference between model predictions and field measurements appears greatest for densely vegetated canopies. Ongoing research is investigating factors that could give rise to the discrepancy, e.g., turbulence intermittency, leaf orientation, leaf morphology, leaf flutter, electrical charges, and a number of phoretic effects. In the meantime, many investigators are faced with a decision as to whether to make use of parameterized field results or theoretical descriptions of behaviors that are not yet well examined. Here the history of the ongoing disagreement is reviewed, and some possible resolutions are presented.

show abstract

Measurements of dust deposition velocity in a wind-tunnel experiment

Cited by 52 publications

References 36 publications

A new parameterization of particle dry deposition over rough surfaces

A new parameterization of particle dry deposition over rough surfaces

Near‐surface dust flux enrichment in small particles during erosion events

Dry deposition of particles to canopies—A look back and the road forward

Contact Info

Product

Resources

About