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Ozone Creation

Ozone Creation. Chapter 4 Atmosphere and Surface Energy Balances. Geosystems 6e An Introduction to Physical Geography. Robert W. Christopherson Charles E. Thomsen. Why do we have to learn about energy?. Energy powers the biosphere, hydrosphere, and atmosphere.

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Ozone Creation

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  1. Ozone Creation

  2. Chapter 4Atmosphere and Surface Energy Balances Geosystems 6e An Introduction to Physical Geography Robert W. Christopherson Charles E.Thomsen

  3. Why do we have to learn about energy? • Energy powers the biosphere, hydrosphere, and atmosphere. • Energy deficits are created by the earth’s curved surface—solar insolation varies with latitude. • To compensate for energy deficits, ocean currents, global winds, and weather systems move energy around the globe. This is why we have weather and climate.

  4. Energy Essentials  • Energy Pathways and Principles  • Shortwave energy in from the Sun • Longwave energy out from Earth • Transmission • Passage of energy through atmosphere or water • Refers to shortwave radiation that goes straight through the atmosphere to the surface

  5. Energy Pathways Figure 4.1

  6. Energy Pathways • Insolation input • All radiation received at Earth’s surface – direct and indirect • Scattering (diffuse radiation) • Changing direction of radiation’s movement, without altering its wavelengths • Pollutants, ice, and water vapor increase scattering • Why is diffuse radiation important? • Because it colors the sky

  7. Energy Pathways • Scattering (diffuse radiation) • Rayleigh Principle – the shorter the wavelength, the greater the scattering; the longer the wavelength, the less the scattering • Shorter wavelengths of visible light (blues and violets) scatter the most and dominate the lower atmosphere • More blue present in sunlight, so the sky is blue • If we had NO atmosphere, what color would the sky be?

  8. Energy Pathways • Sunrise/Sunset • When the sun is low on the horizon, its rays must travel through more atmosphere • This increases scattering of shorter wavelengths (blues) so that only the longer wavelengths color the sky (oranges, reds)

  9. Energy Pathways • Refraction – change in speed and direction of light • When a form of radiation moves from one medium to another (air to water, space to atmosphere), its speed and direction change • The wavelengths of radiation are bent into different angles, separating the light into its component colors • Rainbows – created when visible light passes through raindrops, is refracted, and reflected showing all colors

  10. Refraction Figure 4.3

  11. Refraction • Mirage – an image that appears near the horizon where light waves are refracted by layers of air at different temperatures and densities on a hot day • When the sun is low in the sky, its light must penetrate through more air – its refracted by layers of air at different temperatures and densities creating a mirage

  12. Refraction Figure 4.4

  13. Energy Essentials • Albedo - % of insolation an object reflects • Darker colors have lower albedos (they absorb more insolation) • Lighter colors have higher albedos (they reflect more insolation) • During the day, clouds reflect radiation back to space • At night, clouds reflect longwave radiation back to Earth’s surface

  14. Energy Essentials • Aerosols • Volcanic origin • Decrease atmospheric albedos • Leads to cooling of almost 1°F • Insolation reflected by dirty sky

  15. Albedo Figure 4.5

  16. Energy Balance in the Troposphere   • Greenhouse Effect – where gases (carbon dioxide, water vapor, methane, and CFCs) absorb insolation and reradiate it back to Earth in longer wavelengths thereby warming the lower troposphere • The Greenhouse Effect and Atmospheric Warming • Atmosphere absorbs heat energy • Atmosphere delays transfer of heat from Earth into space

  17. Earth–Atmosphere Radiation Balance Figure 4.12

  18. Energy Budget by Latitude Figure 4.13

  19. Daily Radiation Patterns Figure 4.14

  20. Simplified Surface Energy Balance • NET R = • +SW (insolation) • –SW (reflection) • +LW (infrared) • –LW (infrared) Figure 4.16

  21. Global NET R Figure 4.17

  22. Global NET R • Non-vegetated surfaces lose heat in one of 3 ways: • Latent heat of evaporation – energy released as water changes state • Sensible heat – heat you can feel and measure; convection and conduction • Ground heating and cooling – energy stored during warm periods and released during cool periods

  23. El Mirage, CA Radiation Budgets Pitt Meadows, BC Figure 4.20

  24. The Urban Environment Figure 4.21

  25. Urban Heat Island Figure 4.22

  26. Urban Heat IslandPilotProject Figure 4.23

  27. Solar Cooking Solution Figure FS 4.1.1

  28. Solar Energy Figure FS 4.1.2

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