Cg. Yao et al., A NUMERICAL-MODEL OF THE TRANSPORT AND DIFFUSION OF PERONOSPORA-TABACINA SPORES IN THE EVOLVING ATMOSPHERIC BOUNDARY-LAYER, Atmospheric environment, 31(11), 1997, pp. 1709-1714
Numerical solutions of the diffusion equation of Peronospora tabacina
spores from a finite-area source over flat terrain in the evolving con
vective boundary layer are presented. Temporal variations in the relea
se of spores, atmospheric stability, wind speed, and eddy diffusivity
are considered. The model also includes the vertical variations of win
d and eddy diffusivity. The model results indicate that ground level c
oncentrations decrease with time as wind speed and eddy diffusivity in
crease in the evolving convective boundary layer. The loss of P. tabac
ina spores due to deposition at the surface also decrease with increas
ing instability and wind speed. Deposition is found to be particularly
important close to the source area. (C) 1997 Published by Elsevier Sc
ience Ltd.