The saturated adiabatic lapse rate is the rate at which the temperature of a saturated parcel falls as it rises, its vapour condensing to keep it saturated. The curve it follows on a diagram of temperature against pressure is a moist adiabat. When the condensed water is assumed to fall out at once, the ascent is called pseudo-adiabatic.
উদাহরণ
Example 21.20 (The energy in the Norman sounding)
Lift the surface air of Example 21.4. It saturates at , up, and follows a moist adiabat. Below the sounding is itself nearly saturated and the parcel stays a few tenths of a degree colder than its surroundings; then comes the inversion between and , where the temperature rises by in and the parcel finds itself too cold. It becomes warmer than its surroundings only at , above the ground, its LFC, and stays warmer up to its EL at , above sea level, just below the tropopause the sounding reports at . On a fine grid of pressures the areas of the skew-T figure are CAPE and CIN with the temperature, and and with the virtual temperature: the moisture of the parcel adds its own buoyancy. Parcel theory gives .