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

This preview shows pages 1–2. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern