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Sun's Effect on Weather

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Basic overview of how the Sun effects Earth's weather.

Basic overview of how the Sun effects Earth's weather.

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  • 1. The Sun’s Effect on Weather
  • 2. Contents
    • The Sun’s Key Roles
    • Effects on Earth’s weather
    • Moving Air: The Wind
    • Evaporation
    • Hurricanes
  • 3. What is the Sun??
    • The Sun is a star, the closest star to planet earth.
    • It is the largest object in the solar system, contains 99.8% of the total mass.
    • It is estimated to be about 4.5 billion years old.
    http://www.flickr.com/photos/gsfc/4445502369/in/set 72157623527696147/ Let’s take a look!!
  • 4. The Sun’s Key Roles
    • The sun supplies light and heat to our solar system.
    • The sun is the Earth’s major source of heat energy.
    • The Sun’s heat sustains life and controls our climate.
  • 5. The Sun’s Key Roles
    • The Sun keep the temperature of most of the Earth’s surface at 51 to 49 degrees Celsius.
      • Most living things can only survive at 0 to 49 degrees Celsius.
    • Did You Know : If the amount of sunlight reaching the Earth was cut by 1/10th, the oceans would turn to ice and life on Earth would cease to exist.
  • 6. Sun’s Effect on Weather
    • The Sun is a major contributor to the world’s weather.
    • The Sun’s heat warms the Earth’s land and water surfaces.
    • The Earth absorbs the heat and releases it into the atmosphere, which heats the air above, and causes moving air.
    • The movement of air causes winds which lead to weather changes.
  • 7. Sun’s Effect on Weather
  • 8. The Wind
    • The absorption and release of heat energy into the atmosphere results in moving air, also known as Wind.
    • The air moves, because the surface is unevenly heated. (some surfaces absorb heat faster than others)
    • With movement, the air pressure (weight of air pressing on everything around it) changes, these changes affect weather.
  • 9. The Wind: Sea Breeze
    • On a Beach : When land heats up faster than water, air above land becomes warmer than air above water.
    • The warm land air rises, and is replaced by cool moving air from above the water.
    • This is known as a breeze (or Sea Breeze)
    • This type of air movement can happen anywhere where the surfaces are unevenly heated.
  • 10. The Wind: Sea Breeze
  • 11. Evaporation
    • One factor that affects air and weather is water vapor.
      • Creates Air Moisture
    • Evaporation is the process of changing liquid to gas. When Earth’s liquid water (oceans etc…) evaporates, it releases gas called water vapor.
    • Heat from the Sun speeds up evaporation
  • 12. Evaporation
    • The water vapors are held in the atmosphere, as air cools, the vapors become condensation (tiny droplets of water that form clouds)
    • When the droplets grow larger and get too heavy, they fall back to Earth as precipitation:
      • rain, snow, hail, or sleet.
  • 13. Evaporation
    • Water vapors in the air causes humidity.
    • Humidity and temperature combined causes moving air masses, which results in weather front.
      • Cold Front – moving mass of cool air
      • Warm Front – moving mass of warm air
  • 14. Evaporation and Air Movement Let’s take a look at this process, click on the umbrella!!!
    • Water vapors in the air cause humidity. Humidity and temperature combined causes moving air masses, which results in weather fronts.
    • A front refers to the “front or leading” edge of a moving air mass:
      • Cold Front – leading edge of a mass of cool air
      • Warm Front – leading edge of a mass of warm air
  • 15. Hurricanes
    • Weather Fronts can lead to severe weather, such as Hurricanes.
    • Hurricanes are large, violent tropical storms with wind speeds greater than 117km/hr
    • Hurricanes begin as thunderstorms over warm water, the heat from the water, wind, and moisture help fuel the storm.
  • 16. Hurricanes
    • Hurricane winds move counterclockwise, while the eye of the storm (middle) remains calm.
    • Let’s take a look at the movement of a hurricane.
      • http://www.teachertube.com/viewVideo.php?title=Hurricane_Ike_by_3D_Weather_Globe&video_id=49703
  • 17. Lesson Recap:
    • The Sun’s Key Roles
    • Effects on Earth’s weather
    • Moving Air: The Wind
    • Evaporation
    • Hurricanes
  • 18. Online Resources
    • www.HurricaneKatrina.com
    • www.teachertube.com
    • www.Google.com
    • http://nineplanets.org/sol.html
    • http://www.windows2universe.org/sun/solar_atmosphere.html
    • http://www.intellicast.com/Local/WxMap.aspx?weather=hdVisSatIRBlend

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