Sci 10 Lesson 4 April 20 - Weather


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Sci 10 Lesson 4 April 20 - Weather

  1. 1. Homework from last class: <ul><li>Complete “Layers of the Atmosphere” worksheet </li></ul><ul><li>Complete the Reading Check questions 1-5 on p. 443 </li></ul><ul><li>Read over class notes and check out the class blog: </li></ul>
  2. 2. Temperature in Earth’s Atmosphere
  3. 3. Weather Chapter 10.2 pp. 443-446
  4. 4. What Is Weather? <ul><li>Weather: the conditions in the atmosphere at a particular place and time. </li></ul><ul><ul><li>“ Weather” describes all aspects of the atmosphere and is closely related to the transfer of thermal energy. </li></ul></ul><ul><ul><li>Atmospheric pressure , measured with a barometer , is the amount of pressure the molecules in the atmosphere exert at a particular location and time. </li></ul></ul><ul><ul><ul><li>Atmospheric pressure is measured in Pascals (Pa) = 1 N/m 2 </li></ul></ul></ul><ul><ul><ul><ul><ul><li> 1000 Pa = 1 kPa </li></ul></ul></ul></ul></ul>pp. 443 - 446 Atmospheric pressure exerts force on you from all directions.
  5. 5. Altitude and Atmospheric Pressure <ul><ul><ul><ul><li>As altitude increases , the density of the air decreases  the atmospheric pressure also decreases . </li></ul></ul></ul></ul><ul><ul><ul><ul><li>When we drive up a mountain or fly in an airplane, our ears “pop” to balance the higher atmospheric pressure in our ear with the lower external atmospheric pressure . </li></ul></ul></ul></ul><ul><ul><ul><li>At sea level, atmospheric pressure = 1 kg/cm 2 , </li></ul></ul></ul><ul><ul><ul><li>and as you increase altitude , the pressure drops . </li></ul></ul></ul>
  6. 7. Temperature and Atmospheric Pressure <ul><ul><ul><li>Warm air is lighter and less dense than cool air and so warm air has a lower pressure than cool air. </li></ul></ul></ul><ul><ul><ul><li>The movement of air at different temperatures also affects atmospheric pressure. </li></ul></ul></ul>pp. 445 warm air cold air = Atmospheric pressure decreases cold air warm air = Atmospheric pressure increases
  7. 8. Humidity and Atmospheric Pressure <ul><li>Humidity: measurement of the amount of water vapour in the air </li></ul><ul><li>The more humid the air, the lighter it is. </li></ul><ul><ul><li>Water vapour is lighter than oxygen and nitrogen in dry air. </li></ul></ul><ul><ul><li> Humid air has lower pressure than dry air </li></ul></ul><ul><ul><li>When pressure drops , moist air is arriving in the area. </li></ul></ul>p. 446
  8. 9. Humidity and Atmospheric Pressure <ul><ul><li>Specific humidity: the total amount of water vapour in the air. </li></ul></ul><ul><ul><li>Dew point: the temperature where no more water vapour can be held by air </li></ul></ul><ul><ul><li>Relative humidity: the percentage of the air that is currently holding water vapour </li></ul></ul><ul><ul><ul><li>73 percent relative humidity means that the air is holding 73 percent of the water vapour it could before reaching its dew point. </li></ul></ul></ul>p. 446
  9. 10. Meteorology Training! <ul><li>Vancouver’s favourite meteorologist, Mark Madryga! </li></ul>Do you listen to my weather report but never understand what I mean when I say “ high pressure system ” and “ prevailing winds ”? Now is your chance to become a meteorologist in training!
  10. 11. Instructions: <ul><li>1) You will be divided into 6 groups. Each group will become experts on a particular type of weather system: </li></ul><ul><li>Pressure systems </li></ul><ul><li>Prevailing winds and local winds </li></ul><ul><li>Coriolis effect </li></ul><ul><li>Global wind systems </li></ul><ul><li>Jet streams </li></ul><ul><li>Fronts </li></ul><ul><li>Take notes using the Weather Systems worksheet provided. </li></ul><ul><li>2) As a group, come up with 2 key questions about your weather system. </li></ul><ul><li>3) You will be placed into a mixed group of experts. Teach each other the key information about your weather system. Take notes on all the types of weather systems. </li></ul><ul><li>4) I will quiz each of you on a type of weather system, so be prepared to answer! </li></ul>
  11. 12. The Coriolis Effect <ul><li> </li></ul>
  12. 13. Jet Streams <ul><li>Flight times: </li></ul><ul><li>Vancouver to Toronto: 4 hr 20 </li></ul><ul><li>Toronto to Vancouver: 5 hr 01 </li></ul>
  13. 14. Extreme Weather Project
  14. 15. Homework for next class: <ul><li>Make a crossword puzzle using the Words to Know for Ch. 10.2 (p. 436) and other terms in Ch. 10.2 </li></ul><ul><ul><li>Minimum 10 terms </li></ul></ul><ul><ul><li>The best crossword puzzle will be used as a Ch. 10.2 quiz the following class! </li></ul></ul><ul><li>Begin working on the Extreme Weather project </li></ul><ul><ul><li>Due Thursday, April 27 </li></ul></ul><ul><li>Read over class notes and check out the class blog: </li></ul>
  15. 16. Works Cited <ul><li>Images taken from the following sources: </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul><ul><li> </li></ul>