The expression of the moist buoyancy frequency indicates that it is not completely correct to use the moist adiabatic lapse rate as a static stability parameter of a saturated atmosphere, because the contribution of both the water vapor and condensed water gradients are ignored. This paper shows that the vapor gradient effect is usually larger than the condensed water one, and can be taken into account by introducing a new temperature lapse rate as a stability parameter. The new lapse rate is always greater than the moist adiabatic one, implying an increase of the atmospheric stability estimate at any temperature and for both liquid water and ice saturation conditions.
On the Stability Criterion in a Saturated Atmosphere
RICHIARDONE, Renzo;
2001-01-01
Abstract
The expression of the moist buoyancy frequency indicates that it is not completely correct to use the moist adiabatic lapse rate as a static stability parameter of a saturated atmosphere, because the contribution of both the water vapor and condensed water gradients are ignored. This paper shows that the vapor gradient effect is usually larger than the condensed water one, and can be taken into account by introducing a new temperature lapse rate as a stability parameter. The new lapse rate is always greater than the moist adiabatic one, implying an increase of the atmospheric stability estimate at any temperature and for both liquid water and ice saturation conditions.
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