Lesson Plan 2 – Day 2 Earth’s Energy Budget. Bell Work: We know that if the Sun kept inputting energy and it didn't go anywhere, then we would eventually.

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Presentation transcript:

Lesson Plan 2 – Day 2 Earth’s Energy Budget

Bell Work: We know that if the Sun kept inputting energy and it didn't go anywhere, then we would eventually be fried. What do you think happens to this energy? Why don't we all burn up?

Variables in the Energy Budget Where on Earth – Pole vs. Equator Reflection (albedo) – Material type Clouds Atmosphere Absorption and Re-radiation

Sun emits radiation Earth intercepts sunlight Input = Sunlight (short wave) Output= ? 30% is reflected

Follow the Energy

Energy Moves in Three Ways Conduction Convection Radiation

Radiation seen in Infrared Images

Radiation When energy is absorbed by an object (rock, water, building), the temperature of the object increases. All objects emit radiation. The amount and wavelength range is dependent on the temperature of the object. As the temperature increases (hotter), the wavelengths emitted by the object decreases (becomes shorter wavelengths).

Objects Radiate Heat Earth absorbs and re-radiates energy In Earth’s Energy Budget, all of Earth is considered together – Air (Atmosphere) – Land (Lithosphere) – Ice (Cryosphere) – Ocean/Water (Hydrosphere) – Life (Biosphere)

What can you say about emitted heat? It comes in a range of LONG wavelengths

Wavelengths of Energy Emitted by the Sun and Earth SHORTLONG

Follow the Energy....

Sun emits radiation Earth intercepts sunlight Input = Sunlight (short wave) Output= absorbed and re-radiated (long wave) 30% is reflected

Missing one more variable A small part of the atmosphere is made of heat-trapping gases. These gases absorb long wave radiation. They are called greenhouse gases. Examples: Water Vapor (H 2 O), Carbon Dioxide (CO 2 )

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Not all gases have the same behavior Some gases are greenhouse gases. Most of the gases in the atmosphere do NOT absorb long wave radiation.

Follow the Energy

Sun emits radiation Earth intercepts sunlight Input = Sunlight (short wave) Output= absorbed and re-radiated, (long wave) heat trapped by greenhouse gases 30% is reflected

Only a little over half of the absorbed energy is re-radiated. What happens to the other energy?

It remains absorbed by the Earth and causes a change in temperature What if there wasn’t an atmosphere?

Concept Map Additions Long wave radiation Short wave radiation Write 2 paragraphs describing what happens to the flow of energy into the Earth system.

Optional Slides

opstory/2005/earth_energy.html

Follow the Energy VIDEO Energy Budget in Equilibrium