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Earth's Insolation and Radiation Patterns

Explore the variations in insolation, radiation, and temperature on Earth, and understand the factors affecting these patterns. Discover the impact of latitude, electromagnetic energy, and atmospheric gases on Earth's climate.

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Earth's Insolation and Radiation Patterns

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  1. Warm up 1. At which latitude does the Earth receive the greatest intensity of insolation on June 21? • 0° • 23½° South • 23½° North • 90° North 2. Which form of electromagnetic energy is radiated from the Earth’s surface with the greatest intensity? • x-rays • infrared rays • ultraviolet rays • visible light rays

  2. Look at the following chart:

  3. Variation in Duration of Insolation Duration of Insolation – how long the sun is up in the sky. The Savings Bank Analogy Insolation = Salary Radiation lost to space = Bills Bank account = Temperature If salary is more than bills, what happens to your bank account? If bills are more than salary, what happens to your bank account?

  4. Similarly…. When Insolation is MORE than radiation lost to space, temperature will increase. When Insolation is LESS than radiation lost to space, temperature will decrease. (if you put in more than you take out, bank account goes up…and vice versa)

  5. Questions… When is insolation at a maximum?...minimum? When is Temperature at a maximum?...minimum? What accounts for the difference?

  6. Well…. Even though insolation reaches a maximum at June 21st, temperature continues to increase well into July and August. The reason: As long as the amount of insolation is greater than the amount lost to space, temperature continues to increase…and vice versa….

  7. Duration of insolation Graph • Which is closest to the equator?... farthest? 2. Which place will see the greatest changes in temperature?

  8. Which diagram best represents the wavelength of most of the sunlight energy absorbed and the wavelength of infrared energy reradiated by the roof of a building at 2 p.m. on a clear summer day?

  9. Which gases in the Earth's atmosphere are the best absorbers of infrared radiation? • carbon dioxide and water vapor • carbon dioxide and oxygen • nitrogen and oxygen • nitrogen and water vapor

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