Convective mixing is by far the most dominant mixing force in the atmosphere. Convective MixingĪlthough wind is a factor in smoke dispersion, it is not really a very effective mechanism by which to mix smoke with clean air. Wind can help to mix smoke with clean air on days when we have good dispersion or a large volume of clean air available with which to mix the smoke. However, on days when dispersion is poor or the volume of clean air is limited, wind will transport the smoke over great distances, resulting in more adverse effects from the smoke. In the atmosphere, the wind acts like a giant spoon, mixing the smoke with clean air. Wind can carry smoke hundreds of metres up into the atmosphere. How well the wind mixes the smoke with clean air is dependent on the velocity of the wind and the underlying topography (there will be greater mixing in areas of uneven topography). ![]() the volume of clean air available to mix the smoke ("dilution is the solution").How well smoke dispersion is on any given day is dependant on three factors: When it comes to understanding the Manitoba Crop Residue Burning Program and daily authorizations, one of the most important things to realize is that the main intent of this program is the control of smoke. On any given day, we are concerned with what is going to happen to the smoke that results from crop residue burning. Daily authorizations restrict or prohibit crop residue burning on days when the smoke dispersion capabilities of the atmosphere are limited or poor. Unfortunately, conditions that are the most favourable for smoke dispersion are often the least favourable for burning crop residue (for example, a storm event)
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