Talk:Outline of air pollution dispersion

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The Pasquill atmospheric stability classes - Table 2

Is ir right? I mean, it is more unstable with less wind? —Preceding unsigned comment added by Koke0 0 (talk • contribs) 10:59, 8 June 2010 (UTC)

I believe so, it's the same table that's on NOAA at least (http://ready.arl.noaa.gov/READYpgclass.php)

Doing a little more research into it, it has to do with the temperature gradient during the day, notice that the opposite trend is happening at night Bboppy (talk) 20:05, 3 July 2013 (UTC)

Characterization of Atmospheric Turbulence - Scale dependence?

I think it would be important/necessary to mention in this section that scale dependent dispersion is a fundamental principle. Big plumes spread fast in x direction, medium in z direction. Small plumes spread slowly in x, and very slow in z. This can happen for any flow if the initial size of clouds are smaller than the largest eddies that are causing this mixing. In the atmosphere, there is no limit on the size of the mixing motions, so bigger clouds will experience larger and stronger mixing motions This principle comes from the general properties governed by variance = 2Kt Dianeroher (talk) 20:56, 26 April 2017 (UTC)

References

Pasquill atmospheric stability classes - further description

I think further discussion of the stability classes would be helpful. Small comments such as pointing out that wind breaks down all types of stratification and pushes all classes towards neutral can assist in understanding the underlying mechanisms. Providing examples of the classes could also be beneficial such as describing how clear nights allow the surface of the Earth to cool more quickly creating more stable conditions and how the sun creates unstable stratification by warming the ground, creating an imbalance with the cooler, denser air above and promoting vertical mixing.

Mme11 (talk) 05:51, 28 April 2017 (UTC)

References

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