Now we are ready to do some calculations related to DPT and cooling processes of
ID: 114043 • Letter: N
Question
Now we are ready to do some calculations related to DPT and cooling processes of an air mass. Read each problem carefully. You must show or explain how you got your answer for each question below. DPT and Overnight Temperature Change 13. We check our ground level instruments at 10:00pm. They indicate that Air Temperature (T) 10°C and SH 5 g/kg. Our forecast model predicts that the temperature will drop through the night at the rate of 1.4°C per hour. Assuming SH remains stable, at what time will the Dew Point Temperature be reached and we can expect Ground-level Fog? 14. The following night we check our instruments again. At 10:00pm T 15'C and SH- 5g/kg. The next morning, Ground-level Fog appeared at 5:50 am. At what rate did the temperature drop overnight? Provide the rate in °C per hour) 15. What accounts for the time difference in Ground-level Fog formation between the two nights from questions 13 and 14? Explain.Explanation / Answer
Answer:
As fog appears when temperature of water vapour reaches at its saturation point, also called dew point. The time difference between two nights represents the temperature difference in two nights. As temperature changes between nights, and formation of ground level fog also changes.
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