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New Topic: Atmosphere & Weather. Objectives: To know the meaning of key terms. To name the layers of the atmosphere. To describe the changing characteristics of the atmosphere with altitude. Key Term Bingo!. Layers of the Atmosphere.
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New Topic: Atmosphere & Weather Objectives: To know the meaning of key terms. To name the layers of the atmosphere. To describe the changing characteristics of the atmosphere with altitude.
Layers of the Atmosphere • Use the information on the worksheet to complete a graph showing the layers of the atmosphere.
Global Energy • TO DO: • Feedback Q1-4 (5).(10) • Energy in the Atmosphere: Look at diagrams A&B on sheet and complete Q5&6. • The Heat Budget: Slide 2 & diagram C. (5) • Heat Loss: Complete Q7. (5)(5) • One of the reasons for uneven heating of Earth’s surface: How curvature of the Earth affects the altitude of the Sun – Slide 3. • Horizontal Transfers Q8 & 9 (see slide 4 for Ocean Currents) (10) • Factors Affecting Insolation: Q10 (see slide 5&6 for Seasonal Changes). (20) • HW = Questions on ‘Global Temperature Patterns’ sheet. Objectives: To understand how energy from the Sun is passed to the Earth. To describe the factors affecting insolation. To explain why the Equator doesn’t warm up and Poles don’t cool down despite them receiving different amounts of insolation.
The Heat Budget • The Earth is not heating up or cooling down (as a result of insolation it receives). • There is a positive heat balance within the tropics (i.e. incoming insolation > outgoing terrestrial radiation). • There is a negative heat balance at the poles (high latitudes) as well as at high altitudes due to outgoing terrestrial radiation > incoming insolation. • Transfer of energy occurs to prevent tropics from overheating and poles from becoming too cold.
As the angle of the sun in the sky decreases… the land area heated by a given ray increases the depth of the atmosphere though which the ray passes increases 40°N Earth Equator Sun thereforethe amount of insolation lost also increases 40°S sothe higher the latitude the lower the temperature.
The Changing Position of the Overhead Sun Vernal equinox – neither N/S pole has inclination towards the sun. Earth’s axis makes a 90° with a line drawn to the sun at the Equator. Winter solstice – S Pole axis leans at 23.5° towards the sun. Sun’s rays at noon are 90° over Tropic of Capricorn. Winter Spring Autumn Summer Summer Solstice - N. Pole axis leans at 23.5° towards the sun. Suns rays at noon are 90° over Tropic of Cancer. Autumnal equinox – day and night equal (12 hours each).
The Changing Position of the Overhead Sun for the Northern Hemisphere
