Calculated and Observed Seasonal and Annual Krypton-85 Concentrations at 30-150 km From a Point Source

K, Telegadas, G.J. Ferber, J.L. Heffter, and R.R. Draxler

*Atmospheric Environment*, Vol. 12, pp.
1769-1775, 1978

**Abstract** - One year of weekly average
Kr-85 concentrations observed at 13 sampling locations from 30 to
150 km from a quasi-continuous point source is used in a
verification study involving two air pollution models. The first, a
stability wind rose model, similar to those widely used for
long-term regional pollution studies, overestimates the seasonal
and annual values by an approximate factor of 4 on the average.
Factors that contribute to the overestimation are the use of
surface winds, which a slower than stack-height winds, and a likely
tendency to overestimate the frequency and duration of stable
conditions. The second, a trajectory-diffusion model developed by
the Air Resources Laboratories, shows good agreement with the
observed concentrations. Calculated seasonal averages are
generally within a factor of 2 of the observed average values.
Calculated annual averages are within +/- 20% of the observed
average values at most stations.

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