EXERCISE 21 PROBLEMS-PART I (S.I. Units) Assume that a parcel of air is forced t

Question

EXERCISE 21 PROBLEMS-PART I (S.I. Units) Assume that a parcel of air is forced to rise up and over a 4000-meter-high mountain (shown below). The initial temperature of the parcel at sea level is 30°C, and the lifting condensation level (LCL) of the parcel is 2000 meters. The DAR is 10°C/1000 m and the SAR is 6°C/1000 m. Assume that condensation begins at 100% relative humidity and that no evaporation takes place as the parcel descends. 3000 m 2000 m 1000 m 30°C 0 m Calculate the temperature of the parcel at the following elevations as it rises up the w ward side of the mountain. 1. °C (b) 2000 °C (c) 4000 m m (a) 1000 m

Explanation / Answer

a) As the DAR is 10degree Celcius per 1000m, suppose you are at 0m and want to measure air temperature at 1000m, the difference is 1000. So, you'll use 1. Thus 1*10degree = 10degree.

Thus, at 1000m, the parcel temperature will be 10degree.

b) The parcel temperature at 2000m will be = 2*10 = 20degree. (2000m-0m = 2000; consider it as 2)

c) Similary, the parcel temperature at 4000m will be = 4*10 = 40degree

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