Lab 3 - Lab 3 Humidity stability and clouds Monday 22nd...

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Lab 3: Humidity, stability and clouds Monday, 22 nd February 2016 Omolara Afeni TA: Electra Skaarup Lab section: A05 Instructor name: Elyn Humphreys Course number: GEOG2013 PART 1: Absolute vs. Relative measures of humidity 1. Table 1. Humidity measurements inside and outside Loeb building using a sling psychrometer. Dry bulb temperatur e (˚C) Wet bulb temperatur e (˚C) Wet bulb depressio n (˚C) Relative humidit y (%) Saturatio n vapour pressure (kPa) Vapour pressur e (kPa) Dew point temperatur e (˚C) Inside 26 23 3 76 3.361 2.55 22 Outsid e 8 3.5 4.5 39 1.072 0.42 - 5 2. One might expect that the dew point temperature to be very similar inside and outside because there is fairly the same pressure inside and outside, but relative humidity is expected to be lower inside than out because the cold, air from outside is capable of holding more moisture than when it gets inside and becomes warmer. PART 2: Thermodynamic Diagrams (Stuve diagram). 1. Take a parcel of air at 15˚C and 900 mb pressure; plot that point on your diagram. Now if that parcel of air was lifted to 600 mb and no condensation occurred, what would be the temperature of the parcel? -17˚C [1 mark] 2. If the same parcel descended to 1000 mb, what would its temperature be? -32˚C [1 mark] 3. Given a parcel of dry air at 30˚C and 1000 mb, lift this parcel of air vertically into the atmosphere until its temperature is -20˚C. At what pressure did this occur? 548mb [1 mark] 4. Given a parcel of dry air at -35˚C and 500 mb determine the temperature of the air parcel if it were to sink to the surface (1000 mb) 16˚C [1 mark] 5. Use the thermodynamic diagram provided in lab to find the saturation mixing ratio for: [4 marks] 10˚C and 1000 mb 8 g kg -1 , 20˚C and 1000 mb 14.9 g kg -1 , 30˚C and 1000 mb 27 g kg -1
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