Atmosphere lesson
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Atmosphere lesson

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Atmosphere lesson Atmosphere lesson Presentation Transcript

  • The Atmosphere• The sun’s energy interacts with Earth’s atmosphere and the oceans, providing Earth’s climate and weather and produce the clouds, winds, storms, rains, etc.
  • The Structure of the• Troposphere Atmosphere –Temperatures decrease with altitude 16oC  -60oC
  • The Structure of the• Troposphere Atmosphere –The air is warmed by heat radiating from Earth’s surface, the evaporation of water vapor, and water vapor condensing back to Earth. –Extends from Earth’s surface upward 12 km (7 miles) and contains 90% of the atmospheric gases. View slide
  • The Structure of the Atmosphere (cont’d) • Stratosphere – The tropopause (the dividing line between the troposphere and the stratosphere) occurs where the temperature no longer decreases. – Temperatures increase with altitude -60oC  0oC View slide
  • The Structure of the Atmosphere (cont’d) • Stratosphere – Contains the ozone layer (O3) that reduces the amount of harmful ultraviolet radiation. – Extends from 12 km to 50 km (7-30 miles). – Contains 9% of the atmospheric gases.
  • The Structure of the Atmosphere (cont’d) • Mesosphere – The stratopause (between the stratosphere and mesosphere) occurs where the temperature stops increasing. – The temperature decreases with altitude 0oC  -90oC
  • The Structure of the Atmosphere (cont’d) • Mesosphere –There are very few gas molecules, so the pressure is 1/1000th of that at Earth’s surface. –Extends from 50 km to 90 km (30- 54 miles).
  • The Structure of the Atmosphere (cont’d)• Thermosphere –The mesopause (between the mesosphere and thermosphere) occurs where the temperature stops going down.
  • The Structure of the Atmosphere (cont’d)• Thermosphere –The temperature increases with altitude -90oC  unknown –This is the site of the Aurora Borealis
  • Composition of Air and Air Pressure• Air contains nitrogen (78%); Oxygen (21%); Argon (1%); Carbon Dioxide (0.03%); and Neon, Helium, Krypton, Xenon, and Hydrogen (trace amounts)• Water vapor and other contaminants are not included in the composition listed above.
  • Composition of Air and Air Pressure• Air pressure is the force with which a column of air presses down on Earth’s surface.• The average atmospheric pressure on Earth’s surface at sea level = 1 atm (atmosphere).