Question

Please Answer number 3 - 9

tue 4000 3S 20 TEmS 2. Calculate the average rate of temperature change for the environmental lapse rate. Express this rate of change per 1000 meters. Show your calculations. 18.6 C 26-189 4386°C 18°- 99 S 000m S o00 13 3. At sea level, a parcel of air has a temperature of 35 "C and a dew point temperature of 15 "C. Let's assume that this air is forced to rise. Plot the rising air's temperature as it moves through the atmosphere. Also note the temperatures at the various altitudes on the right side of the graph. Use two different color pencils to plot the temperature profile of the rising air. Note. your graph should have one color for the environmental lapse rate, one color for the dry adiabatic lapse rate and a third color for the saturated adiabatic lapse rate. Don't forget to label the various colors. 4. Label the lifling condensation level on your graph. 5. Does the stability of the [parcel change as it increase in altitude? If yes, at which altitude does this change occur? 6. On the graph. label the section of the atmosphere that contains stable air and which section contains unstable air. at 4000 m, what is most likely to occur if the lifting mechanism is gone? Will it continue to rise, remain where it is, or subside? Why' 8. If the dew point temperature of the rising air was 25 C instoad of 15 "C, what would change? o. Would the lifting condensation level change? If so, what would the new LCL be? b. Would the stability ot the atmosphere change? If so, at which altitude would the stability pattern change the atmosphere will be stable, unstable or conditionally unstable in the following scenarios 9. State whether Environmental Lapse Rate is less than the DAR and SAR: Environmental Lapse Rate is greater than the DAR and SAR: ELR is 9 "C/1000m and the DAR is 10'C/1000m and the SAR is 6 ℃/1000m: 10. If clouds develop under stable conditions, the clouds will tend to be (select all that apply] a.stratiform cirriform c. cumuliform I1. If clouds develop under unstable conditions, the clouds will tend to be (select all that apply): a. stratiform b. cirriform cumulifornm

Answer 1

3. The dry and moist adiabatic lapse rates are shown as red and green lines. The blue dotted line shows the decrease in dew point from the surface until it is equal to the dry adiabatic lapse rate.

DALR ELR -4.5 unstable 1.5 7.5 stable LCL 25 3S 釦 TEmS

4. The Lifting Condensation Level is labeled as LCL at 2500 m altitude where the dew point is equal to the air temperature of the parcel, i.e. 10 C.

5. The stability of the air parcel changes at 3500 m altitude shown as a white circle above which the parcel becomes warmer than the environment.

6. The section of the air which contains stable air is marked as yellow where the parcel is colder than the environment. The section containing unstable air is marked as brown where the parcel is warmer than the environment.

7. If the lifting mechanism is gone at 4000m altitude, then the parcel will continue to rise as its temperature would be higher than the environment.

8. a) If the dew point of the parcel is 25 C, then the LCL would change as the air temperature would be equal to the dew point at a lower altitude, i.e.

At 1250m, the temperature of the dry parcel would be 35 - 12.5 = 22.5 C

At 1250m, the dew point temperature of the parcel would be 25 - 2.5 = 22.5 C

So the LCL would be at an altitude of 1250m if the dew point is 25 C.

b) The stability of the parcel would change as the parcel would become unstable at 1600 m altitude as shown by the blue circle on the graph below.

unstable LCL stable 30 20 扣 I0 2o 知

9. The atmosphere will be unstable if the Environmental Lapse Rate is less than the DALR and the SAR as the parcel will rise due to a higher temperature than the environment.

The atmosphere will be stable if the Environmental Lapse Rate is more than the DALR and the SAR as the parcel will sink due to a lower temperature than the environment.

The atmosphere will be conditionally unstable if the Environmental Lapse Rate is 9 C i.e. between the DALR and the SAR as the atmosphere will be stable in dry air but unstable in moist air.