11.6
Results from Daysmoke for weak smoke plumes
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Daysmoke also generated spatial patterns of ground-level PM2.5 smoke concentrations. Time series of 5-min average patterns of PM2.5 concentration show centers (or patches) of high concentration surrounded by areas of low concentration transported with the wind. Peaks and spikes of time series of PM2.5 observed at three trucks positioned strategically beneath the plume from 1 - 4 miles (1.6 – 6.4 km) from the burn site confirm the Daysmoke results.
Smoke plumes from wildland fires are characterized by numerous updraft “cores” that merge convectively into a single core or a multiple-core plume by the time the plume has ascended to an equilibrium level. The plumes from the Fort Benning prescribed fires were described by 6 – 8 updraft cores. The multiple-core updraft structure of the plumes was confirmed by photo-images.
Daysmoke is planned as a smoke-injector for CMAQ. The accuracy of the model in simulating details of weak smoke plumes adds to our confidence in the accuracy of Daysmoke to place smoke in the atmosphere.