Multiple Choice Questions 1. The adiabatic lapse rate is -1\'C/100 meters and th
ID: 119868 • Letter: M
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Multiple Choice Questions 1. The adiabatic lapse rate is -1'C/100 meters and the existing temperature profile is -1.5°C/100 meters, Under such conditions, which is true? It is a condition of great stability and a thermal inversion will surely result. h It is a condition of great stability and thermal inversions will not result. It is an unstable condition conducive to clean air and no thermal inversions. d. It is a condition of stability and one can expect some thermal inversions. Due to a high pressure subsidence a thermal inversion layer is formed above the ground as shown in the following graph. The AL Ri -065C/100 m To what height above the ground will polluted air rise if it is released at ground level at a temperature 1.6'C warmer than its 2. surroundings? a. 104 m b. 40 m e. 260 m f. 280 m g. 300 m h. 2300 rm c. 200 m d. 250 mExplanation / Answer
1. For the above statement, the condition is of great stability and a thermal inversion will surely result. When the adiabatic lapse rate is less than the temperature profile, a colder air is on the surface, which has good stability and when height increases, there will be a layer of warmer aer which gives the temperature inversion.
2. GIven the ALR is -.650C/100m
For the cold air layer, the minimum temperature is 00C after which temperature inversion takes place. Hence at -0.650C/100m lapse rate, the height required for the parcel of air to cool to 00C is
0.65/100= 1.6/x
= x= 160/0.65= 246m ~ 250m
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