GEOG220 Lecture Notes - Lecture 16: Fluid Parcel, Dew Point, Natural Convection
28 Jul 2018
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As long as the air in a rising or sinking parcel remains unsaturated, the rate of adiabatic cooling or warming remains constant. This cooling or warming rate is called the dry adiabatic lapse rate (dalr) and it has a value of approximately 10 c/1000m: please refer to my notes from tuesday week 8, for more information. It varies greatly depending upon the amount of water vapor present in an air parcel (and hence in the temperature of the parcel). This is because a warm saturated parcel will be holding more water vapor than a cold, saturated parcel: values range from, 2 c/1000m (moist parcel) to 9. 5 c/1000m (dry parcel, the average malr = 6 c/1000m remember that. We will call the temperature change with height of the surrounding atmosphere the environmental lapse rate (elr). This is simply the temperature change we would feel as we climbed a mountain.
