EESB03H3 Lecture Notes - Lecture 3: Fluid Parcel, Lapse Rate, Cool Air
18 Jan 2017
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Vertical stability: the amount of air going up is replaced by same amount of air coming down. Adiabatic processes: a change in temperature arising solely from compression and expansion of an air parcel with no interchange of heat with its surroundings. Dry adiabatic lapse rate: the rate of change of temperature with the height for unsaturated air. Moist adiabatic lapse rate: the rate of change of temperature with height for saturated air. This is less than the dry adiabatic lapse rate. Environmental lapse rate: the actual rate pf change of temperature of the atmosphere. This depends on location and other surrounding conditions. Latent heat of condensation is released as air rises and cools. The heating by condensation is offset by the cooling by condensation. Two examples where air is rising, 30 degrees in the surface and is changing with the environmental lapse rate. In left one unsaturated air is colder than surrounding air.
