Homogeneous Atmosphere Pavel Zenin MA-283 The aims

Homogeneous Atmosphere Pavel Zenin, MA-283

The aims of the presentation l l The main aim of this presentation is to give you the definition of Homogeneous Atmosphere Try to show the difference between the real atmosphere and homogeneous atmosphere

Definition l l A hypothetical atmosphere in which the density is constant with height. A homogeneous atmosphere has a finite total thickness which is given by Rd. Tv/g, where Rd is the gas constant for dry air and Tv is the virtual temperature (degrees K) at the surface.

Homogeneous atmosphere at 0 degrees centigrade l For a surface temperature of 273 degrees K, the vertical extent of the homogeneous atmosphere on the earth is approximately 8000 meters.

The real atmosphere l Hydrostatic equilibrium is a little more complicated to apply to air, because air is very compressible. The same principle still applies, but we now have to deal with a density that varies with pressure and temperature.

References l l l http: //encyclopedia 2. thefreedictionary. com/homogeneous+atmosphe re http: //mintaka. sdsu. edu/GF/explain/thermal/hydrostatic. html http: //www. exodictionary. org/index. php? title=Homogeneous_Atmosp here http: //en. wikipedia. org/wiki/Air_mass_(astronomy) http: //ocw. usu. edu/forest__range__and_wildlife_sciences/wildland_fi re_management_and_planning/unit_7__atmospheric_stability_and_i nstability_1. html