Surface temperature of 25 ∘C, which is 15 ∘C higher than the middle-latitude city mentioned in Part A. Vertical soundings reveal an environmental lapse rate of 6.5 ∘C per kilometer and indicate that the tropopause is encountered at 16 kilometers. What is the air temperature at the tropopause?

at an altitude of 16 kilometers the temperature of tropopause is -79° C.

Explanation:

Given that:

The surface temperature = 25° C

Vertical constant environmental Lapse Rate ( Change in temperature with height) = 6.5° C/km

Altitude of tropopause = 16 kilometers

It is pertinent to understand that as we move higher up to the tropopause ; temperature decreases.

SO;  we need to  subtract the change in temperature from surface temperature

Thus; Air temperature at tropopause = Surface temperature - (Change in temperature till the altitude of tropopasue)

Air temperature at tropopause =  Surface temperatue - (Lapse Rate × Altitude)

Air temperature at tropopause =  25° C - (6.5 ° C/km  ×  16 km)

Air temperature at tropopause =  25° C -  104° C)

Air temperature at tropopause = -79° C

Thus; at an altitude of 16 kilometers the temperature of tropopause is -79° C.