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Layers of the atmosphere watch the video and label your diagram

Layers of the atmosphere watch the video and label your diagram. The atmosphere and ozone. Learning outcomes: All of you should be able to: Identify the different layers of the atmosphere Most of you should be able to: Outline the overall structure and composition of the atmosphere

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Layers of the atmosphere watch the video and label your diagram

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  1. Layers of the atmospherewatch the video and label your diagram

  2. The atmosphere and ozone Learning outcomes: All of you should be able to: • Identify the different layers of the atmosphere Most of you should be able to: • Outline the overall structure and composition of the atmosphere • Identify the role of ozone in the absorption of UV light Some of you might be able to: • Describe the role of ozone in the absorption of UV light

  3. Atmosphere The atmosphere is a mixture of nitrogen (78%), oxygen (21%) and the remaining 1% contains carbon dioxide, water vapour, argon and other components. The stratosphere (10-50km) and the troposphere (up to 10km) are where most reactions affecting life occur

  4. Atmosphere Increasing lightness and decreasing density

  5. Ozone (O3) • Found in 2 layers of the atmosphere • It is a greenhouse gas (GHG) Ozone GOOD BAD

  6. Ozone in the stratosphere forms what we call the “ozone layer” and it is extremely important because it protects the planet from harmful UV radiation Ozone in the troposphere causes pollution as it is a toxic gas but we will look at that later.

  7. Ozone layer Ozone is a reactive gas and the majority is found in the so-called “ozone layer” (the lower stratosphere). While watching the video describe what is happening to the ozone layer. What time of year does the size of the hole increase?

  8. Absorption of UV radiation In the formation and destruction of ozone, UV radiation is absorbed. • Under the influence of UV radiation oxygen molecules are split into oxygen atoms. • Oxygen atoms are extremely reactive and can combine with an oxygen molecule to form ozone. • Ozone can also absorb UV radiation and will split into an oxygen atom and oxygen molecule.

  9. Absorption of UV radiation ESSENTIAL Without it life on land would be impossible!! Three types UV radiation: UVA – lowest energy / longest wavelength (relatively harmless) UVB– ozone layer absorbs ~50% UVC – highest energy / shortest wavelength (most harmful) – ozone layer absorbs more than 99%

  10. Effects of UV radiation?? In groups, can you come up with some possible effects of UV radiation? Effects: • Mutations and subsequent effects on health (skin cancer). • Damage to photosynthetic organisms, especially phytoplankton • Damage to consumers of photosynthetic organisms, especially zooplankton

  11. Which gases are causing the depletion of the ozone layer? Chlorofluorocarbons (CFCs)

  12. Checking outcomes Identify the different layers of the atmosphere. What are they? In order Outline the overall structure and composition of the atmosphere. What is the overall structure? Which gases? Identify the role of ozone in the absorption of UV light Why’s it important? Where does ozone absorb UV light? Describe the role of ozone in the absorption of UV light How does ozone absorb UV light?

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