Unstable Air [5 points] Unstable air is air that, once set in vertical motion, w

Question

Unstable Air [5 points]

Unstable air is air that, once set in vertical motion, will tend to continue to rise in the atmosphere with increasing velocity. Air is considered unstable when the ELR is greater than the DALR (i.e., ELR > 10°C/1000m).

Step 1: Draw a line through Point A on Graph B to represent an ELR of 15°C/1000m. Do not hand in the graph – this is for your reference only.

A parcel of dry air at Point A (1000 m above the ground), the same temperature as surrounding air, is forced upward.

Step 2: Draw a line on Graph B to represent the parcel’s rate of temperature change with height. Start the line at point A, and extend upward to 4000m.

e) What will be the temperature of the rising air parcel at an altitude of 4000m? What will be the temperature of the ambient air at this altitude? [2 points]

f) Assume that at 4000 m, the parcel reaches dew point (saturation). What will be its temperature at 5000 m? [1 point]

g) Will this rising parcel of air, once set in motion, continue to rise past this point (5000)? For how long? Why/Why not? [2 points]

Explanation / Answer

Answer:e

According to the given condition, the temperature rises with the rate of 15 degree celsius per 1000m. Therefore, at 4000m it would be become 60 degrees, the ambient air would shows around 15 degree because this air would not unstable and moves upward.

Answer:f

The temperature would not change further after reaching saturation point.

Answer:g

Yes, untill unless their saturation point does not reached, it will continue to rise untill their saturation point reached.

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