moist-adiabatic lapse rate

moist-adiabatic lapse rate

[′mȯist ¦ad·ē·ə¦bad·ik ′laps ‚rāt]
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This lapse rate isn't constant like its dry counterpart, so the remainder of the parcel lapse rate (magenta line) will follow a curved, moist-adiabatic lapse rate.
Likewise, an air parcel from the environment will also maintain its value [[theta].sub.v,e] after an arbitrary vertical displacement but, by contrast, the cloud parcel will obtain a lower value [[theta].sub.v,cb] as it follows the moist-adiabatic lapse rate down to the cloud-base.
However, because a just unsaturated negatively buoyant air parcel will maintain a constant virtual potential temperature (according to a dryadiabatic lapse rate) during its descent through the cloud layer, it will rapidly become positively buoyant with respect to the cloud environment as the virtual potential temperature in the cloud layer approximately obeys a moist-adiabatic lapse rate (Roode and Wang 2006).