Temperature Inversion Study Notes

Temperature Inversion

• Definition: Temperature inversion is a meteorological phenomenon where, under certain conditions, temperature increases with altitude rather than the normal decrease.

• Normal Circumstances:

  • Typically, in the atmosphere, temperature decreases as altitude increases.

• Description of Inversion:

  • In specific scenarios, narrow bands at certain altitudes show a temperature increase with altitude.
  • Eventually, the temperature starts to decrease again at higher altitudes.
  • This phenomenon is referred to as a "layer of temperature inversion."

• Condition of Occurrence:

  • Temperature inversions generally occur in a stable air mass.
  • Characteristics of a stable air mass:
  • Minimal vertical motion of air.

• Contrast with Unstable Air Mass:

  • In unstable air masses, vertical motion is more pronounced, making it harder to maintain a stable layering of temperatures.
  • Unstable air masses lead to mixing, preventing the formation of a clear inversion layer.

• Air Mass Interaction:

  • When cold air is at the bottom and warm air is at the top within the inversion layer, wind shear develops.
  • Wind shear leads to differing movements between the cold and warm air masses, causing turbulence at the inversion boundary.

• Effects of Being on the Inversion Layer:

  • If one is situated right on the layer of temperature inversion, the air movement can be bumpy due to the conflict between the cool and warm air masses.

• Ground-Based Temperature Inversion:

  • Occurs when cold air is retained near the ground, especially during nighttime.
  • The ground cools rapidly, radiating colder temperatures while a warmer layer of air sits above it.
  • This can lead to colder air being trapped close to the ground.

• Formation of Fog:

  • If humidity levels are sufficient, temperature inversion can result in the formation of radiation fog at night.
  • Radiation fog occurs due to the cooling of the surface and the presence of warmer air above, facilitating condensation in the colder air near the ground.