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On the efficiency and correction of vertically oriented blunt bioaerosol samplers in moving air

Michel, Dominik ; Rotach, Mathias ; Gehrig, Regula ; Vogt, Roland

In: International Journal of Biometeorology, 2012, vol. 56, no. 6, p. 1113-1121

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    Titel
    • On the efficiency and correction of vertically oriented blunt bioaerosol samplers in moving air
    Autor
    • Michel, Dominik. Meteorology, Climatology and Remote Sensing, University of Basel, Basel, Switzerland
    • Rotach, Mathias. Federal Office of Meteorology and Climatology MeteoSwiss, Zurich, Switzerland
    • Gehrig, Regula. Federal Office of Meteorology and Climatology MeteoSwiss, Zurich, Switzerland
    • Vogt, Roland. Meteorology, Climatology and Remote Sensing, University of Basel, Basel, Switzerland
    Dokumententyp
    • Postprint
    Sprache
    • Englisch
    Veröffentlicht in
    • International Journal of Biometeorology, 2012, vol. 56, no. 6, p. 1113-1121. Springer-Verlag
    Andere elektronische Ausgabe
    OAI-PMH-ID
    • oai:doc.rero.ch:311955
    Summary
    The aspiration efficiency of vertical and wind-oriented Air-O-Cell samplers was investigated in a field study using the pollen of hazel, sweet chestnut and birch. Collected pollen numbers were compared to measurements of a Hirst-type Burkard spore trap. The discrepancy between pollen counts is substantial in the case of vertical orientation. The results indicate a strong influence of wind velocity and inlet orientation relative to the freestream on the aspiration efficiency. Various studies reported on inertial effects on aerosol motion as function of wind velocity. The measurements were compared to a physically based model for the limited case of vertical blunt samplers. Additionally, a simple linear model based on pollen counts and wind velocity was developed. Both correction models notably reduce the error of vertically oriented samplers, whereas only the physically based model can be used on independent datasets. The study also addressed the precision error of the instruments used, which was substantial for both sampler types