Sci 10 Lesson 4 April 20 - Weather
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Sci 10 Lesson 4 April 20 - Weather

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Sci 10 Lesson 4 April 20 - Weather Sci 10 Lesson 4 April 20 - Weather Presentation Transcript

  • Homework from last class:
    • Complete “Layers of the Atmosphere” worksheet
    • Complete the Reading Check questions 1-5 on p. 443
    • Read over class notes and check out the class blog: http://msoonscience.blogspot.com/
  • Temperature in Earth’s Atmosphere
  • Weather Chapter 10.2 pp. 443-446
  • What Is Weather?
    • Weather: the conditions in the atmosphere at a particular place and time.
      • “ Weather” describes all aspects of the atmosphere and is closely related to the transfer of thermal energy.
      • Atmospheric pressure , measured with a barometer , is the amount of pressure the molecules in the atmosphere exert at a particular location and time.
        • Atmospheric pressure is measured in Pascals (Pa) = 1 N/m 2
            • 1000 Pa = 1 kPa
    pp. 443 - 446 Atmospheric pressure exerts force on you from all directions.
  • Altitude and Atmospheric Pressure
          • As altitude increases , the density of the air decreases  the atmospheric pressure also decreases .
          • 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 .
        • At sea level, atmospheric pressure = 1 kg/cm 2 ,
        • and as you increase altitude , the pressure drops .
  •  
  • Temperature and Atmospheric Pressure
        • Warm air is lighter and less dense than cool air and so warm air has a lower pressure than cool air.
        • The movement of air at different temperatures also affects atmospheric pressure.
    pp. 445 warm air cold air = Atmospheric pressure decreases cold air warm air = Atmospheric pressure increases
  • Humidity and Atmospheric Pressure
    • Humidity: measurement of the amount of water vapour in the air
    • The more humid the air, the lighter it is.
      • Water vapour is lighter than oxygen and nitrogen in dry air.
      •  Humid air has lower pressure than dry air
      • When pressure drops , moist air is arriving in the area.
    p. 446
  • Humidity and Atmospheric Pressure
      • Specific humidity: the total amount of water vapour in the air.
      • Dew point: the temperature where no more water vapour can be held by air
      • Relative humidity: the percentage of the air that is currently holding water vapour
        • 73 percent relative humidity means that the air is holding 73 percent of the water vapour it could before reaching its dew point.
    p. 446
  • Meteorology Training!
    • Vancouver’s favourite meteorologist, Mark Madryga!
    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!
  • Instructions:
    • 1) You will be divided into 6 groups. Each group will become experts on a particular type of weather system:
    • Pressure systems
    • Prevailing winds and local winds
    • Coriolis effect
    • Global wind systems
    • Jet streams
    • Fronts
    • Take notes using the Weather Systems worksheet provided.
    • 2) As a group, come up with 2 key questions about your weather system.
    • 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.
    • 4) I will quiz each of you on a type of weather system, so be prepared to answer!
  • The Coriolis Effect
    • http://www.youtube.com/watch?v=mcPs_OdQOYU
  • Jet Streams
    • Flight times:
    • Vancouver to Toronto: 4 hr 20
    • Toronto to Vancouver: 5 hr 01
  • Extreme Weather Project
  • Homework for next class:
    • Make a crossword puzzle using the Words to Know for Ch. 10.2 (p. 436) and other terms in Ch. 10.2
      • Minimum 10 terms
      • The best crossword puzzle will be used as a Ch. 10.2 quiz the following class!
    • Begin working on the Extreme Weather project
      • Due Thursday, April 27
    • Read over class notes and check out the class blog: http://msoonscience.blogspot.com/
  • Works Cited
    • Images taken from the following sources:
    • http://www.fanpop.com/spots/weather/images/250420/title/severe-weather-wallpaper
    • http://www.abcteach.com/directory/theme_units/weather/weather_clip_art/
    • http://funlok.com/index.php/humor/airline-announcements-26102009.html
    • http://myctrring.com/clip-art/body-parts-clip-art/
    • http://www.clipartheaven.com/show/clipart/outdoor_recreation/hiking_&_climbing/mountain_climbing_01-gif.html
    • http://www.cnrinch.com/digital-thermometer.htm
    • http://www2.canada.com/albernivalleytimes/features/livegreen/storyimage.html?id=9ed5c6b1-af56-4c05-b3c4-65e39ac5c8c8&img=6c097be5-6736-4ad1-b522-43ba7a0eb9f4&path=%2Falbernivalleytimes%2Ffeatures%2Flivegreen%2F
    • http://www.paphosholidays.co.uk/weather-in-paphos