On the basis of the average temperature gradient in the situations described, cl

Question

On the basis of the average temperature gradient in the situations described, classify the degree of stability (unstable, neutral or stable) of the atmosphere. Assume the atmosphere is unsaturated.

a. Temperature at ground level is 21 grades C; temperature at 1500 ft is 27 grades C.

b. Temperature at ground level is 21 grades C; temperature at 2500 ft is 15 grades C.

c. Temperature at ground level is 15 grades C; temperature at 1950 ft is 9 grades C.

d. Temperature at ground level is -4 grades C; temperature at 2000 ft is -15 grades C.

e. Temperature at ground level is 0 grades C; temperature at 500 ft is -7 grades C.

f. Temperature at ground level is -4 grades C; temperature at 700 ft is -2 grades C.

Explanation / Answer

a) Temperature increases with altitude - Stable

b) Lapse rate = 6/2500 = 2.4 F/ 1000 feet - Stable ( since Lr< 5.5 )

c) Lapse rate = 6/1950 = 3.07 F/1000 feet - Stable ( since Lr< 5.5)

d) Lapse rate = 11/ 2000 = 5.5 F/ 1000 feet = Neutral ( since Lr= 5.5 )

e ) Lapse rate = 7/500 = 14 F /1000 feet = Unstable ( since Lr > 5.5)

f) Temperature increases so stable.

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