Now we are ready to do some calculations related to DPT and cooling processes of

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 10:00 pm. 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? 4. The following night we check our instruments again. At 10:00pm T 15'C and SH 5 g/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)

Explanation / Answer

Answer:

Since, Air temperature is 10 degree C and specific humidity are stable and rate of decreasing temperature are 1.4 degreeC per hour. Therefore, in 7 hours the would decrease about 9.8 degree and fills the ground level with fog around 5am.

Answer:

Since, temperature are 15 degree C and ground level fog generate at 5.50am means in 7.83 hour. Therefore, rate of temperature over night are 15/7.83= 1.9 degree C per hour.

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