English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/201289
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar a otros formatos:

Title

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

AuthorsWaza, A.; Schneiders, K.; May, J.; Rodríguez, Sergio ; Epple, Bernd; Kandler, K.
Issue Date2019
CitationAtmospheric Measurement Techniques 12: 6647- 6665 (2019)
AbstractFrequently, 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 energydispersive X-ray analysis was used to characterize different, commonly used passive samplers with respect to their sizeresolved 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 PM concentration measurements by an optical particle spectrometer. The results indicate that a BSNE and Sigma-2 can be good options for PM 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.
Publisher version (URL)http://dx.doi.org/10.5194/amt-12-6647-2019
URIhttp://hdl.handle.net/10261/201289
Identifiersdoi: 10.5194/amt-12-6647-2019
issn: 1867-8548
Appears in Collections:(IPNA) Artículos
(EEZA) Artículos
Files in This Item:
File Description SizeFormat 
amt-12-6647-2019.pdf6,41 MBAdobe PDFThumbnail
View/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.