Abstract
Integrated horizontal flux (IHF) experiments determine the rate of volatilisation of pesticides, ammonia etc. from small circular plots to the atmosphere. To examine their accuracy, we have simulated IHF experiments by calculating the trajectories of many gaseous particles. We show that the IHF method, which requires measurements only of mean concentrations and mean cup wind speeds at several heights above the centre of the plot, estimates the rate of emission Q 0 (the ground-to-atmosphere mass flux density) to within about 20%, provided the radius R exceeds 20 m and the surface roughness length z 0 of the source plot does not exceed 0.1 m. Since a large portion of the horizontal flux to be measured occurs well below about R/20, we conclude that where it is practical, the IHF method is acceptably accurate.
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