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| Titel |
Fluorescent biological aerosol particles measured with the Waveband Integrated Bioaerosol Sensor WIBS-4: laboratory tests combined with a one year field study |
| VerfasserIn |
E. Toprak, M. Schnaiter |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 1 ; Nr. 13, no. 1 (2013-01-10), S.225-243 |
| Datensatznummer |
250017548
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| Publikation (Nr.) |
 copernicus.org/acp-13-225-2013.pdf |
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| Zusammenfassung |
In this paper bioaerosol measurements conducted with the Waveband Integrated
Bioaerosol Sensor mark 4 (WIBS-4) are presented. The measurements comprise
aerosol chamber characterization experiments and a one-year ambient
measurement period at a semi-rural site in South Western Germany. This study
aims to investigate the sensitivity of WIBS-4 to biological and
non-biological aerosols and detection of biological particles in the ambient
aerosol. Several types of biological and non-biological aerosol samples,
including fungal spores, bacteria, mineral dust, ammonium sulphate,
combustion soot, and fluorescent polystyrene spheres, were analyzed by WIBS-4
in the laboratory. The results confirm the sensitivity of the ultraviolet
light-induced fluorescence (UV-LIF) method to biological fluorophores and
show the good discrimination capabilities of the two excitation
wavelengths/detection wavebands method applied in WIBS-4. However, a weak
cross-sensitivity to non-biological fluorescent interferers remains and is
discussed in this paper.
All the laboratory studies have been undertaken in order to prepare WIBS-4
for ambient aerosol measurements. According to the one-year ambient aerosol
study, number concentration of fluorescent biological aerosol particles
(FBAP) show strong seasonal and diurnal variability. The highest number
concentration of FBAP was measured during the summer term and decreased
towards the winter period when colder and drier conditions prevail. Diurnal
FBAP concentrations start to increase after sunset and reach maximum values
during the late night and early morning hours. On the other hand, the total
aerosol number concentration was almost always higher during daytime than
during nighttime and a sharp decrease after sunset was observed. There was
no correlation observed between the FBAP concentration and the
meteorological parameters temperature, precipitation, wind direction and
wind speed. However, a clear correlation was identified between the FBAP
number concentration and the relative humidity. Humidity-controlled release
mechanisms of some fungal spore species are discussed as a possible
explanation. |
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