Why have you changed the depth to switch from a surface to a sub-surface vapour model from 10cm to 100cm?
The CLEA software now assumes that the sub-surface vapour emission model to outdoor air should be applied when the depth below ground to the top of source exceeds 100cm. At shallower depths, the surface vapour emission model will be used. Although a relatively arbitrary choice of depth, this ensures a smooth transition in calculated air concentrations between the two emission algorithms. At very shallow depths, the sub-surface model estimates higher outdoor air concentrations than the surface model which is counter intuitive.
