Abstract
It is well known that if turbulent mass convection is modelled as diffusion, errors result unless trajectories from the source (at h) to the point of observation (Zp) comprise many statistically- independent segments (Taylor, 1921). We show that this is not guaranteed merely by the Lagrangian timescale (r) at the source being small (e.g., source at ground), but that a better criterion is t >> max(r(h), ~Zp)), where t is a typical travel time to zp.
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