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Micrometeorological measurements of particle deposition velocities to moorland vegetation

Nemitz, E.; Gallagher, M.W.; Duyzer, J.H.; Fowler, D.. 2002 Micrometeorological measurements of particle deposition velocities to moorland vegetation. Quarterly Journal of the Royal Meteorological Society, 128 (585). 2281-2300. 10.1256/qj.01.71

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Abstract/Summary

Size-segregated particle number flux measurements using a micrometeorological technique, over the diameter (dp) range 0.1 to 3 µm and total particle number fluxes (dp>11 nm), are reported for Scottish moorland vegetation. Mean particle deposition velocities (Vd) range from 0.3 mm s-1 for 0.1 µm particles to more than 10 mm s-1 for 3 µm particles. On average, the measured size-dependence of Vd 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 Vd increased linearly with the friction velocity (u*). Total particle number fluxes measured with a condensation particle counter are dominated by the high concentration of small particles; therefore, this provides the first estimate of Vd for particles smaller than those that can be sized by optical techniques, for short vegetation. Values of Vd 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 fluxes that were frequently observed at the study site need to be included in the computation of average values. At this site, upward fluxes are therefore more likely to be an artefact due to statistical constraints than a systematic physical phenomenon

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1256/qj.01.71
Programmes: CEH Programmes pre-2009 publications > Biogeochemistry > BG01 Measuring and modelling trace gas, aerosol and carbon
CEH Sections: _ Atmospheric Sciences
ISSN: 0035-9009
Additional Keywords: Condensation particle counter, Eddy-correlation technique, Optical particle counter, Particle number fluxes, Slinn model
NORA Subject Terms: Ecology and Environment
Atmospheric Sciences
Date made live: 21 May 2009 16:26
URI: http://nora.nerc.ac.uk/id/eprint/3642

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