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Sources of energy2
- 1. Factors that affectsweather and climate:- latitude and altitude.
- 2. LEARNING OBJECTIVES: To beable to reason out why there is a varying rates of surface insolation. To analyse the factors which contribute to solar heat balance of earth and atmosphere. Radiation, absorption, reflection, convection, conduction. LEARNING OUTCOMES ALL: students are able to reason out how the rates of insolation decreases with latitude from equator to poles. MOST: Students are able to differentiate between long and short wave radiation. SOME: students are able to evaluate and justify the impact of different factors acting on the climatic condition of the place.
- 3. The sun asan energy source The atmospheric system-absorption and reflection
- 5. What is thedifference between short wave and long wave radiation?
- 6. Insolation Insolation is theamount of solar energy reaching the Earth’s surface that is available as heat. Rates of insolation vary greatly from place to place, the main control is latitude.
- 7. The heat energythat is radiated is of long wavelength, which is readily absorbed by water vapor, water droplets (clouds), and carbon dioxide in the atmosphere. These in turn are heated up by the absorption and themselves radiate heat in all directions, much of which is re-radiated back to the surface. Why night temperatures are higher on cloudy nights comparatively to clear nights?
- 8. : insolation, absorption,radiation ,conduction and convection. Students in groups are going to plan a backdrop for Shakespeare play and explain how they can plan and show the above effect.
- 9. Home learning: Discuss withyour parents any changes they feel in insolation for the last 10 years. Can support with news reports.
- 11. Insolation-the effect oflatitude on temperature
- 12. Why insolation isgreater at the equator and in the tropics?
- 14. Examples of worldtemperature (Table-1)
- 15. Activity 1-Draw a dividedbar graph to show what happens to 100% of light energy radiated from the sun. 2-Describe how clouds cover affects surface temperature (a) during the day (b) at night (c) overall 3-Draw a scatter graph using the data in Table 1 to show the relationship between latitude and temperature of the coldest month. Place latitude on the x axis and temperature on y axis. 4-Explain why rates of insulation are different between the tropical and polar latitude.
- 16. Why insolation isgreater at the equator and in the tropics? The sun’s light has a direct path through the Earth’s atmosphere and less is lost by reflection. Because the Sun rays are vertical when they strike the surface, each ray has a smaller area of surface to heat up.
- 17. Why Insolation issmaller near the poles? Near the poles the sun’s rays approach the Earth’s surface at an oblique angle, so that each ray has a larger surface area to heat up. More of the light is absorbed and reflected, which leaves less to be used for heating up the surface.
- 18. Why costal citiesare cooler in summer than those situated further inland? This is because the sea does not heat up as quickly as the land since light rays penetrate more deeply into the water and currents distribute the heat. Breezes from the sea, therefore, are cooler than those from the land. Why snow covered regions are the coldest places on the Earth? A high proportion of the Sun’s light is reflected instead of being absorbed. 80% of the light that reaches the surface is reflected back from snow covered surfaces. Therefore snow has a high albedo.
- 20. Why do wehave varying differences in length of days and night in different places of the world.
- 22.