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Full Geography Secondary 3 Express- Weather and Climate 2
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Full Geography Secondary 3 Express- Weather and Climate 2

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  • 1. + 3 Express Pure Geog: Weather and Climate 7th March 2012 Elements of Weather: Relative Humidity Arman Alluwie TP2 SHSS
  • 2. + 2 Concerns of Previous Lessons: Website  Can we download the slides?  Yes. www.armanalluwie.blogspot.comArman Alluwie TP2 SHSS
  • 3. + 3 Concerns of Previous Lessons: Latitude/ Longitude/ Altitude  Latitude / Longitude / Altitude  geographic coordinates used to specify a location in relation to another imagine the earth as a sphereArmanAlluwie TP2 SHSS
  • 4. + 4 Latitude90° North (+90°)0° 90° South (-90°)ArmanAlluwie TP2 SHSS
  • 5. + 5 LongitudeArman Alluwie TP2 SHSS 0° Prime Meridian
  • 6. + 6 Latitude90° North (+90°)0° 90° South (-90°)ArmanAlluwie TP2 SHSS 0° Prime Meridian
  • 7. + 7 Altitude  Since the Earth is not flat, we need the third axis to measure elevation (height)  whiteboardArman Alluwie TP2 SHSS
  • 8. + 8 Concerns of Previous Lesson: Maritime Effect Concept: Water bodies heats up and cools down slower SLOWER Land bodies Water BodiesArmanAlluwie TP2 SHSS
  • 9. + 9 Concerns of Previous Lesson: Mistakes Coastal Areas Non- Coastal Areas*  Cooler Summers  Warmer Summers  Air over water bodies heat  Air over land bodies heat up slowly up faster  Warmer Winters  Cooler Winters  Air over water bodies lose  Air over water bodies lose heat slowly heat slowly  eg. San Diego  Eg. Winnipeg  maritime effect  continental effect *areas deep within the continentArman Alluwie TP2 SHSS
  • 10. + 10 Temperature: Distance from the Sea Coastal Areas Non- Coastal Areas*  Cooler Summers  Warmer Summers  Air over water bodies heat  Air over land bodies heat up slowly up faster  Warmer Winters  Cooler Winters  Air over water bodies lose  Air over land bodies lose heat slowly heat faster  eg. San Diego  Eg. Winnipeg  maritime effect  continental effect *areas deep within the continentArman Alluwie TP2 SHSS
  • 11. + 11 Temperature: Cloud Cover temperature rises up quickly earth’s surfaceArman Alluwie TP2 SHSS
  • 12. + 12 Temperature: Cloud Cover heat escapes easily earth’s surfaceArman Alluwie TP2 SHSS
  • 13. + 13 Temperature: Cloud Cover reflects part of the incoming solar radiation reflects back heat to the ground earth’s surfaceArman Alluwie TP2 SHSS
  • 14. + 14 Temperature: Cloud Cover reflects back heat to the ground earth’s surfaceArman Alluwie TP2 SHSS
  • 15. + 15 Temperature: Cloud Cover  More cloud cover  Smaller difference in day and night temperaturesArman Alluwie TP2 SHSS
  • 16. + 16 Lesson objectives  By the end of the lesson, we will be able to  explain how evaporation, condensation, precipitation and saturation affect relative humidityArman Alluwie TP2 SHSS
  • 17. + 17 Humidity  amount of water vapour present in the air  places near the equator have high humidity  large amount of water vapour in the airArman Alluwie TP2 SHSS
  • 18. + 18 Relative Humidity  proportion of water vapor present in the air, in relation to the maximum amount the air can hold1 at particular temperature  expressed as % 100 -  1hold: contain 50 - 25 - relative humidity = 50 %Arman Alluwie TP2 SHSS
  • 19. + 19 Relative Humidity change in temperature 100 - 50 - 100 - 25 - 50 same amount of - water vapour 25 - relative humidity = 50 % relative humidity= ?Arman Alluwie TP2 SHSS
  • 20. + 20 Relative Humidity change in temperature 100 - 100 same amount of same amount of 50 - 50 water vapour water vapour - 25 - - relative humidity= 100% relative humidity > 100%  beyond saturation pointArman Alluwie TP2 SHSS
  • 21. + 21 Relative Humidity http://www.youtube.com/watch?v=CL5cgXwKUXcArman Alluwie TP2 SHSS
  • 22. + 22 Relative Humidity  Recall, what is meant by “saturation”?  air is carrying the maximum amount of water vapor it can hold at that temperatureArman Alluwie TP2 SHSS
  • 23. + 23 Relative Humidity: Changes in Holding Capacitym 6000 4000 2000 temperature changes with increasing altitude 0 sea levelArman Alluwie TP2 SHSS
  • 24. + 24 Relative Humidity: Changes in Water Vapour air parcel wind direction more water vapour land surface large lakes/ oceansArmanAlluwie TP2 SHSS
  • 25. + 25 Revisiting The Water CycleArman Alluwie TP2 SHSS http://www.youtube.com/watch?v=AQKdkponoZM
  • 26. + 26Arman Alluwie TP2 SHSS
  • 27. + 27 Relative Humidity: Precipitation  Definition: water falling from the atmosphere onto the Earth’s surface  form depends on the temperature of the place where it falls Liquid Freezing Frozen Drizzle Freezing Drizzle Snow Rain Freezing Rain Hail Ice Crystals precipitation ≠ rainArman Alluwie TP2 SHSS
  • 28. + 28 Relative Humidity: Cloud Formation http://www.youtube.com/watch?v=SKmLEgUivj4Arman Alluwie TP2 SHSS
  • 29. + 29 Relative Humidity: Relation to Cloud Formation  In pairs, name the processes shown in the video  Condensation/ Evaporation/ Precipitation/ Saturation  Explain each process and describe how the relative humidity changes at each stage of the process  Submit your worksheets to Mr. Arman 10 minutesArman Alluwie TP2 SHSS
  • 30. + 30 Lesson objectives  Are we able to  explain how evaporation, condensation, precipitation and saturation affect relative humidity?Arman Alluwie TP2 SHSS