8. Suppose the environmental lapse rate is 12°C per 1000 metres. If the air temp
ID: 297145 • Letter: 8
Question
8. Suppose the environmental lapse rate is 12°C per 1000 metres. If the air temperature at the surface is 26°C, what would be the air temperature measured by a radiosonde at 5000 metres above the surface? 9. Suppose a parcel of dry air is lifted from the surface to an elevation of 5000 metres. If the temperature inside the air parcel at the surface is 32°C, what would be the temperature of the air inside the parcel at 5000 metres if the rising air parcel remains unsaturated? 10. Consider the temperature of the air at 5000 metres as measured by the radiosonde in (#8). Now consider the temperature of the rising air inside the parcel at 5000 metres in (#9). a) Is the air temperature inside the parcel at 5000 metres warmer or colder than the air surrounding it (as measured by the radiosonde)? b) In this situation would the atmosphere be considered stable or unstable?Explanation / Answer
8. The environmental lapse rate is said to be 12? per 1000 metres. This means for every 1000 meters of ascend, the temperature of the air drops by 12?.
Temperature of the air at the surface = 26?.
So, at an altitude of 5000 meters above the surface, the temperature of the given air would be = -34?.
9. The dry adiabatic lapse rate is 10? per 1000 meters of ascend or descend. It is the rate of change of temperature in a rising or descending unsaturated parcel of air. Here, tue temperature of the air parcel at the surface is 32?. At an altitude of 5000meters above the surface, the temperature of the air parcel would be = -18?.
10. a) the air temperature inside the parcel at 5000 meters is warmer than the air surrounding it.
b) In this condition, the atmosphere is unstable.
Explanation : The rising parcel of air is warmer than the air surrounding it and hence it will continue to rise because warm air is lighter and less dense than cold air. This is considered as an unstable atmosphere.
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