Course review

6.4 Stratospheric ozone

Review each learning objective in this topic, then open its concept explanation or question set.

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Learning objective

6.4.1—Solar radiation spectrum

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• Low frequency radio to high frequency gamma • Infrared, visible light, ultraviolet (UV)

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Learning objective

6.4.2—UV radiation danger

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• Shorter wavelengths, higher frequencies, more energy • UVA, UVB, UVC damage organisms

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Learning objective

6.4.3—Stratospheric ozone protection

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• Absorbs UV radiation from Sun • Protects living organisms from harmful effects

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Learning objective

6.4.4—UV radiation impacts

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• Reduces photosynthesis in phytoplankton • DNA damage: mutations, cancer • Humans: sunburn, premature ageing, cataracts

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Learning objective

6.4.5—Ozone equilibrium

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• Steady state between formation and destruction

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Learning objective

6.4.6—Ozone-depleting substances (ODSs)

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• Destroy ozone molecules • Augment natural breakdown • Not a cause of global warming

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Learning objective

6.4.7—Ozone depletion effects

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• More UVB reaches Earth's surface • Polar "ozone holes" in spring

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Learning objective

6.4.8—Montreal Protocol

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• International treaty regulating CFCs and ODSs • Most successful international environmental cooperation

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Learning objective

6.4.9—Montreal Protocol success

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• Prevented planetary boundary crossing

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