Comment on Allan et al. (2011) QJRMS paper by John Marsham:
Just to note, I would disagree with
"Once lifted from the surface, dust  concentration in the vertical depends
on turbulent mixing, which will be  greatest around 0000 UTC at 500 m. This
explains the shapes of the dust  profiles in Figure 5(b)."

I think turbulence will be minimal around 0000 UTC. FLow is laminar then
(unless shear is so great that RI<0.25 ) the dust will come off the surface
when  u* is highest and then be mixed upwards by BL convection in the day.