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Field comparison of dry deposition samplers for collection of atmospheric mineral dust: results from single-particle characterization

Waza, Andebo and Schneiders, Kilian and May, Jan and Rodríguez, Sergio and Epple, Bernd and Kandler, Konrad (2019):
Field comparison of dry deposition samplers for collection of atmospheric mineral dust: results from single-particle characterization.
In: Atmospheric Measurement Techniques, 12, (12), pp. 6647-6665, ISSN 1867-8548,
DOI: 10.25534/tuprints-00011395,
[Online-Edition: https://doi.org/10.5194/amt-12-6647-2019],
Secondary publishing via sponsored Golden Open Access, [Article]

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Item Type: Article
Origin: Secondary publishing via sponsored Golden Open Access
Title: Field comparison of dry deposition samplers for collection of atmospheric mineral dust: results from single-particle characterization
Language: English
Abstract:

Frequently, passive dry deposition collectors are used to sample atmospheric dust deposition. However, there exists a multitude of different instruments with different, usually not well-characterized sampling efficiencies. As a result, the acquired data might be considerably biased with respect to their size representativity and, as a consequence, also composition. In this study, individual particle analysis by automated scanning electron microscopy coupled with energy-dispersive X-ray analysis was used to characterize different, commonly used passive samplers with respect to their size-resolved deposition rate and concentration. This study focuses on the microphysical properties, i.e., the aerosol concentration and deposition rates as well as the particle size distributions. In addition, computational fluid dynamics modeling was used in parallel to achieve deposition velocities from a theoretical point of view.

Scanning electron microscopy (SEM)-calculated deposition rate measurements made using different passive samplers show a disagreement among the samplers. Modified Wilson and Cooke (MWAC) and Big Spring Number Eight (BSNE) – both horizontal flux samplers – collect considerably more material than the flat plate and Sigma-2 samplers, which are vertical flux samplers. The collection efficiency of MWAC increases for large particles in comparison to Sigma-2 with increasing wind speed, while such an increase is less observed in the case of BSNE. A positive correlation is found between deposition rate and PM10 concentration measurements by an optical particle spectrometer. The results indicate that a BSNE and Sigma-2 can be good options for PM10 measurement, whereas MWAC and flat-plate samplers are not a suitable choice. A negative correlation was observed in between dust deposition rate and wind speed. Deposition velocities calculated from different classical deposition models do not agree with deposition velocities estimated using computational fluid dynamics (CFD) simulations. The deposition velocity estimated from CFD was often higher than the values derived from classical deposition velocity models. Moreover, the modeled deposition velocity ratios between different samplers do not agree with the observations.

Journal or Publication Title: Atmospheric Measurement Techniques
Journal volume: 12
Number: 12
Classification DDC: 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften
Divisions: 11 Department of Materials and Earth Sciences > Earth Science > Atmospheric Aerosol
Date Deposited: 23 Jan 2020 13:24
Last Modified: 09 Jul 2020 06:25
DOI: 10.25534/tuprints-00011395
Official URL: https://doi.org/10.5194/amt-12-6647-2019
Related URLs:
URN: urn:nbn:de:tuda-tuprints-113952
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/11395
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