Chapter 3 Atmospheric Energy and Global Temperatures

1. Chapter 3Atmospheric Energy and Global Temperatures

2. Atmospheric Energy and Global Temperatures • Energy Essentials   • Energy at Earth’s Surface   • Temperature Concepts and Controls   • Earth’s Temperature Patterns  • The Urban Environment

3. Insolation Figure 3.2

4. Energy Pathways Figure 3.1

5. Energy Pathways • Transmission • Scattering • Refraction • Albedo and Reflection

6. Refraction Figure 3.4

7. Refraction Figure 3.3

8. Albedo and Reflection Figure 3.5

9. Clouds and Albedo Figure 3.6

10. Replacing Firewood Fuel with Solar Energy in Kenya

11. Solar Energy with Photovoltaic Cells

12. Heat Transfer • Conduction • Molecule-to-molecule transfer • Convection • Energy transferred by movement • Advection • Horizontally dominant movement • Radiation • Energy traveling through air or space

13. Heat Transfer Figure 3.7

14. Energy Balance in the Troposphere   • The Greenhouse Effect and Atmospheric Warming   • Clouds and Earth’s “Greenhouse”   • Earth–Atmosphere Radiation Balance  

15. The Greenhouse Effect and Atmospheric Warming • Atmosphere absorbs heat energy • A real greenhouse traps heat inside • Atmosphere delays transfer of heat from Earth into space

16. Clouds and Earth’s “Greenhouse” Figure 3.8

17. Outgoing Shortwave Energy Figure 3.9

18. Outgoing Longwave Energy Figure 3.9

19. Earth–Atmosphere Radiation Budget Figure 3.10

20. Energy Balance at Earth’s Surface • Daily Radiation Patterns   • Simplified Surface Energy Balance   • The Urban Environment

21. Daily Radiation Patterns Figure 3.12

22. Simplified Surface Energy Balance • NET R = • + SW (insolation) • – SW (reflection) • + LW (infrared) • – LW (infrared) Figure 3.13

23. Temperature Concepts and Controls • Temperature Scales • Measuring Temperature  • Principal Temperature Controls   • Land–Water Heating Differences

24. Temperature Scales    • Fahrenheit • Celsius • Kelvin 

25. Temperature Scales Figure 3.15

26. Principal Temperature Controls   • Latitude   • Affects insolation • Altitude   • High altitude has greater daily range • High altitude has lower annual average • Cloud Cover   • High albedo • Moderate temperatures – cooler days, warmer nights

27. Effects of Latitude Figure 3.17

28. Altitude Figure 3.18

29. Land–Water Heating Differences  • Evaporation • Transparency • Specific heat • Movement • Ocean currents and sea surface temperatures • Marine vs. continental effects

30. Land–Water Heating Differences   Figure 3.20

31. The GulfStream Figure 3.21

32. Average Sea Surface Temperatures in 1999 from Pathfinder AVHRR Satellite

33. Marine and Continental Climates Figure 3.23

34. Marine and Continental Climates Figure 3.25

35. Earth’s Temperature Patterns • January Temperature Map   • Thermal equator movement southward • More movement over large continents • July Temperature Map   • Thermal equator movement northward • More movement over large continents • Annual Range of Temperatures • Continentality

36. January Temperatures Figure 3.24

37. July Temperatures Figure 3.26

38. Global Temperature Ranges Figure 3.28

39. The Urban Environment Figure 3.29

40. Urban Heat Island Effect in Sacramento California

42. Urban Heat Island Figure 3.30

43. Air Temperature and the Human Body • Wind chill • Correlates cold and wind speed • Heat index • Correlates heat and humidity

44. Wind Chill Table Figure 1

45. Heat Index Table Figure 2

47. End of Chapter 3