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Title:Performance of microAethalometers: Real-world Field Intercomparisons from Multiple Mobile Measurement Campaigns in Different Atmospheric Environments
Authors:Alas, Honey (Author)
Mueller, Thomas (Author)
Weinhold, Kay (Author)
Pfeifer, Sascha (Author)
Glojek, Kristina (Author)
Gregorič, Asta (Author)
Močnik, Griša (Author)
Drinovec, Luka (Author)
Costabile, Francesca (Author)
Ristorini, Martina (Author)
Wiedensohler, A. (Author)
Files:.pdf Alas_-_AAQR_2020_-_accptd_-_Performance_of_microAethalometers-_Real-world_Field_Intercomparisons_from_Multiple_Mobile_Measurement_Campaigns_in_Different_Atmospheric_Environments.pdf (3,54 MB)
Work type:Not categorized (r6)
Tipology:1.01 - Original Scientific Article
Organization:UNG - University of Nova Gorica
Abstract:Small aethalometers are frequently used to measure equivalent black carbon (eBC) mass concentrations in the context of personal exposure and air pollution mapping through mobile measurements (MM). The most widely used is the microAethalometer (AE51). Its performance in the laboratory and field is well documented, however, there is not sufficient data in the context of its performance in different environments. In this investigation, we present the characterization of the performance of the AE51 through field unit-to-unit intercomparisons (IC), and against a reference absorption photometer from three MM campaigns conducted in drastically different environments. Five IC parameters were considered: i) study area, ii) location of IC, iii) time of day, iv) duration of IC, and v) correction for the filter-loading effect. We can conclude that it is crucial where and how long the IC have been performed in terms of the correlation between the mobile and reference instruments. Better correlations (R2 > 0.8, slope = 0.8) are achieved for IC performed in rural, and background areas for more than 10 minutes. In locations with more homogenous atmosphere, the correction of the loading effect improved the correlation between the mobile and reference instruments. In addition, a newer microAethalometer model (MA200) was characterized in the field under extreme cold conditions and correlated against another MA200 (R2 > 0.8, slope ≈ 1.0), AE51(R2 > 0.9, slope ≈ 0.9), and a stationary Aethalometer (AE33) across all wavelengths (R2 > 0.8, slope ≈ 0.7). For MA200, the loading effect was more pronounced, especially at the lower wavelengths, hence the correction of the loading effect is essential to improve the correlation against the AE33. The MA200 and AE51 proved to be robust and dependable portable instruments for MM applications. Real-world quality assurance of these instruments should be performed through field IC against reference instruments with longer durations in areas of slowly changing eBC concentration.
Keywords:Portable instruments, Mobile monitoring, Black carbon, Instrument intercomparisons
Year of publishing:2020
Number of pages:60
COBISS_ID:28340995 Link is opened in a new window
DOI:10.4209/aaqr.2020.03.0113 Link is opened in a new window
License:CC BY 4.0
This work is available under this license: Creative Commons Attribution 4.0 International
Categories:Document is not linked to any category.
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Title:Aerosol and Air Quality Research
Shortened title:AAQR
Year of publishing:2020