Atmospheric stability class factor

In these computations we have assumed a constant dry deposition velocity, although it is actually dependent, among other factors, on wind speed and atmospheric stability. In particular, the dry deposition velocity is typically smaller in stable conditions. However, the loss of pollutant from the plume depends also on the vertical concentration distribution. For stable conditions, the plume is substantially more shallow dry deposition therefore causes an increased decrease of concentration at larger distances, compared with the corresponding case in neutral stability. The apparent convergence of the concentration curves for the two stability classes is fortuitous. 

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