Vertical Flux Measurements of the Submicronic Aerosol Particles and Parametrisation of the Dry Deposition Velocity

Fontan, J.; Lopez, A.; Lamaud, Éric; Druilhet, A.

doi:10.1007/978-3-662-03394-4_30

Cited by 7 publications

(11 citation statements)

References 11 publications

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“…This contrasts with previous measurements (e.g. Fontan et al 1997;Lamaud et al 1994;Nemitz 1998), in which the ratio V d =u ¤ has been found to increase signi cantly for very unstable conditions; at Auchencorth the increase of V d with u ¤ is close to proportional, i.e. V d =u ¤ is almost constant.…”

Section: (E) the Slinn Model-a Theoretical Prediction Of The Depositicontrasting

confidence: 99%

“…8(a)), the deviation from this slope at high frequencies indicates a high contribution of random noise to the measurement of Â N and water vapour density (e w /, showing that even the high Â N detected by the CPC is insuf cient to fully overcome limitations in counting statistics. This is in contrast with the high-volume EC ux sampler of Fontan et al (1997). Since the noise is uncorrelated with w, however, the co-spectral density functions (Fig.…”

Section: (E) the Slinn Model-a Theoretical Prediction Of The Depositimentioning

confidence: 83%

“…The V d values of 50 to 350 mm s ¡1 were larger than theoretically predicted, although it should be mentioned that the site was rather inhomogeneous. Lamaux et al (1994) and Fontan et al (1997) measured deposition velocities at a forest site, with an eddy-correlation device in which particles are charged by the corona effect, and the charge is then detected by an electrometer. Since the charging ef ciency is proportional to surface area, Fontan et al (1997) concluded that 80% of the detected particles had a size between 0.05 and 0.5 ¹m.…”

Section: (E) the Slinn Model-a Theoretical Prediction Of The Depositimentioning

confidence: 99%

“…Lamaux et al (1994) and Fontan et al (1997) measured deposition velocities at a forest site, with an eddy-correlation device in which particles are charged by the corona effect, and the charge is then detected by an electrometer. Since the charging ef ciency is proportional to surface area, Fontan et al (1997) concluded that 80% of the detected particles had a size between 0.05 and 0.5 ¹m. It is likely that the number of charges borne by each particle increased with size, biasing the measurements towards larger particles.…”

Section: (E) the Slinn Model-a Theoretical Prediction Of The Depositimentioning

confidence: 99%

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Micrometeorological measurements of particle deposition velocities to moorland vegetation

Nemitz

Gallagher²,

Duyzer³

et al. 2002

Quart J Royal Meteoro Soc

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SUMMARYSize-segregated particle number ux measurements using a micrometeorological technique, over the diameter (d p ) range 0.1 to 3 ¹m and total particle number uxes (d p > 11 nm), are reported for Scottish moorland vegetation. Mean particle deposition velocities (V d / range from 0.3 mm s ¡1 for 0.1 ¹m particles to more than 10 mm s ¡1 for 3 ¹m particles. On average, the measured size-dependence of V d is almost identical with the prediction by the widely used Slinn model, using the original parameters derived from wind-tunnel studies. Within each size-band V d increased linearly with the friction velocity (u ¤ /. Total particle number uxes measured with a condensation particle counter are dominated by the high concentration of small particles; therefore, this provides the rst estimate of V d for particles smaller than those that can be sized by optical techniques, for short vegetation. Values of V d ranged from 0.2 to 0.6 mm s ¡1 as u ¤ increased from 0.15 to 0.55 m s ¡1 . These deposition rates are one order of magnitude smaller than have been observed for a pine forest stand. The analysis shows that, at least for super-micron particles, the emission uxes that were frequently observed at the study site need to be included in the computation of average values. At this site, upward uxes are therefore more likely to be an artefact due to statistical constraints than a systematic physical phenomenon.

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Section: (E) the Slinn Model-a Theoretical Prediction Of The Depositicontrasting

confidence: 99%

Section: (E) the Slinn Model-a Theoretical Prediction Of The Depositimentioning

confidence: 83%

Section: (E) the Slinn Model-a Theoretical Prediction Of The Depositimentioning

confidence: 99%

Section: (E) the Slinn Model-a Theoretical Prediction Of The Depositimentioning

confidence: 99%

See 2 more Smart Citations

Micrometeorological measurements of particle deposition velocities to moorland vegetation

Nemitz

Gallagher²,

Duyzer³

et al. 2002

Quart J Royal Meteoro Soc

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show abstract

“…In connection with this, local deposition velocity is defined as a flux normalized with concentration and with an opposite sign. The dry deposition velocity of aerosol particles with sizes 0.1 -30 lam was parameterized with particle size [Gallagher et al, 1997], friction velocity [Duan et al, 1988], and/or stability parameter [Fontan et al, 1997]. Gallagher et al, [1997] presented a summary of deposition velocity models to forest canopies including theoretical estimates on known removal processes like Brownian diffusion, interception, and impaction.…”

Section: Introductionmentioning

confidence: 99%

Vertical aerosol fluxes measured by the eddy covariance method and deposition of nucleation mode particles above a Scots pine forest in southern Finland

Buzorius¹,

Rannik²,

Mäkelä³

et al. 2000

J. Geophys. Res.

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Abstract. Particle number fluxes were measured by the eddy covariance method above a Scots pine forest in southern Finland. The observed number fluxes included particles with sizes down to 10 nm in diameter. The errors of measured particle number fluxes resulting from the technical limitations of particle counter and atmospheric fluctuations of water content are estimated.Simultaneous aerosol size distribution measurements were used to obtain information on particle sizes contributing to the flux. During new particle formation events the particle fluxes were dominated by nucleation mode particles, allowing the deduction of the deposition velocities characteristic to those particles. The corresponding deposition velocities were within a range from 5 to 40 mm s -•

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Surface Exchange

Jensen¹,

Pio²

2000

Transport and Chemical Transformation of Pollutants in the Troposphere

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Vertical Flux Measurements of the Submicronic Aerosol Particles and Parametrisation of the Dry Deposition Velocity

Cited by 7 publications

References 11 publications

Micrometeorological measurements of particle deposition velocities to moorland vegetation

Micrometeorological measurements of particle deposition velocities to moorland vegetation

Vertical aerosol fluxes measured by the eddy covariance method and deposition of nucleation mode particles above a Scots pine forest in southern Finland

Surface Exchange

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