Lab 3 Weather and Climate.docx

University of Guelph Department of Geography GEOG*1300 - Introduction to the Biophysical Environment Fall 2023 LABORATORY EXERCISE 3 – WEATHER & CLIMATE In this lab you will develop some basic analog (i.e. Old School) skills working with weather data and instruments, To complete the lab you will need to work This lab is graded out of 25, but will be scaled to be worth the same as your other labs. Due Date: Before your next regularly assigned lab session If I’m reading the calendar properly this is after the midterm. Late submissions will be penalized at a rate of 10 percent of the value of the assignment per day. All assignments must be submitted through CourseLink. Extensions may be available upon appropriate advance request. As always, I encourage you to work collectively to solve technical challenges, to discuss ideas, and to edit prose – but ultimately the work you submit (including graphs, math, and wording) must be your own work. It’s OK to show someone how to make a graph – it’s not OK to email them yours to include in their lab. Procedures. All answers can be completed on the worksheet that follows these instructions. I encourage you to save your final submission as a PDF to make sure that the formatting looks like what you think it will look like! PART A : Relative Humidity measurements 1. Temperature and Relative Humidity are related. Record the observations of dry-bulb and wet-bulb temperatures from the sling psychrometer. Calculate the depression of the wet-bulb and report the classroom’s relative humidity and the dew point temperature (show your work, 2 marks) Air temperature inside classroom ______________ o C Wet-bulb temperature ______________ o C Relative humidity ________________ Dew point temperature ________________ 1

2. If the temperature in the classroom were to increase and the water vapour in the room remained the same explain how the relative humidity would change? (1 mark) 3. Name an instrument used to measure RH other than a sling psychrometer. Spoiler alert: Neigh is halfway to one right answer. (0.5 mark) PART B: Precipitation 4. Given a rainfall rate of 5 mm/hr, calculate the total volume of water (in liters) this would equal if this amount fell over Seattle (land area = 217 km 2 ) during a 3-hour storm. (1 mm of rainfall = 1 l of water over 1 m 2 ). (show your work, 2 marks) 5. Name the instrument most commonly used to measure rainfall and describe how it works. (1.5 marks) 6. How does wind bias this record, and (briefly!) describe one way that meteorologists have tried to correct for this bias. (2 mark) PART C : Clouds 7. Clearly label the lifting condensation level (LCL) in these this and provide a brief definition (2 marks). Definition: 2

a) Choose the best image that represents each of the following cloud types: Cumulus, Cumulonimbus and Cirrus. Label the clouds in the photograph and provide a brief definition for each in the box beside the image. (3 marks) Cloud type: Definition: Cloud type: Definition: 3

Part C: Weather Maps & Forecasting 8. a) In the diagram below draw in the surface wind directions for high and low pressure systems in the northern hemisphere. Ignore topography and surface roughness for now. (2 marks). Cloud type: Definition: 4

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