Dispersion of the bio-aerosol produced by the oak processionary moth

Autor(en)

Lisa Fenk, Bernhard Vogel, Helmuth Horvath

Abstrakt

The oak processionary moth (Thaumetopoea processionea L.) is found in oak forests in most European countries. The caterpillars bear urticating hairs (setae) as a chemical defence. These hairs break off and are small enough to become airborne and be transported by the wind. Upon contact with humans the toxin can cause an allergic reaction that ranges from a skin rash to respiratory distress. In order to measure the terminal settling velocity of this bioaerosol, we used a small elutriator and tested its functionality with particles of known aerodynamic diameter. We determined that the mean settling velocity of the setae is about 1 cm/s, corresponding to an aerodynamic diameter of 19 μm for setae with a diameter of 6 μm and a length of 190 μm. The dispersion of the hairs in the atmosphere for a typical summer day was calculated by means of an Eulerian model. The results of this calculation revealed that the maximum concentrations in the atmosphere on a typical summer day reach 20-30% of the concentration found directly at the source. Those maximum concentrations are reached at a distance from the source that varies between 174 and 562 m, depending on the atmospheric stability and the settling velocity.

Organisation(en)

Aerosolphysik und Umweltphysik

Externe Organisation(en)

Karlsruher Institut für Technologie

Journal

Aerobiologia: international journal of aerobiology

Band

23

Seiten

79-87

Anzahl der Seiten

9

ISSN

0393-5965

DOI

https://doi.org/10.1007/s10453-007-9053-3

Publikationsdatum

2007

Peer-reviewed

Ja

ÖFOS 2012

106006 Biophysik, 103008 Experimentalphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/fc10de19-02b5-416d-9e8b-bbfbb0dce57d