1. Energy in the Atmosphere
Section 2
Atmospheric Heating
Energy in the Atmosphere
Radiation: Energy Transfer by Waves The Earth receives energy from the sun by radiation. Radiation is the transfer of energy as electromagnetic waves.
Conduction: Energy Transfer by Contact Thermal conduction is the transfer of thermal energy (heat) through objects that are in direct contact with each other.
Convection: Energy Transfer by Circulation Convection is the transfer of thermal energy by the circulation or movement of a fluid (liquid or gas.)
Earth is 93 million miles from the sun. Energy from the sun takes approximately 8 minutes to reach earth traveling at 186,000 miles per seconds.
Earth only receives about 2 billionths of the sun’s energy.
End of Slide
Copyright © by Holt, Rinehart and Winston. All rights reserved.

2. Scattering, Absorption, and Reflection
Section 2
Scattering, Absorption, and Reflection
Copyright © by Holt, Rinehart and Winston. All rights reserved.

3. Radiation, Conduction, and Convection
Section 2
Radiation, Conduction, and Convection
RADIATION, CONVECTION AND CONDUCTION & THEIR ROLE IN HEAT TRANSFER IN THE ATMOSPHERE & OCEANS
Radiation is transferred from the sun to the atmosphere and the Earth’s surface and oceans. At night when the Earth cools, it radiates heat back into the atmosphere and outer space.
Convection currents are created by the heating of air & water. The fluids gain energy, move faster, become less dense and rise (water evaporates). As they move higher into the atmosphere, they cool, lose energy, become more dense and sink.
Conduction plays a small part in heat transfer in the atmosphere and oceans.
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4. Energy in the Atmosphere continued
Section 2
Atmospheric Heating
Energy in the Atmosphere continued
The Greenhouse Effect and Life on Earth The greenhouse effect, shown on the next slide, is the process by which gases in the atmosphere absorb thermal energy and radiate it back to Earth.
The Radiation Balance: Energy In, Energy Out The amount of energy Earth receives and the amount of energy returned to space must be approximately equal.
Greenhouse Gases and Global Warming Some scientists think that an increase of greenhouse gases in the atmosphere may be the cause of global warming, the gradual warming trend occurring on the planet.
Human contributions to global warming include:
Deforestation
Auto Pollution
Factory Pollution
End of Slide
Copyright © by Holt, Rinehart and Winston. All rights reserved.

5. Copyright © by Holt, Rinehart and Winston. All rights reserved.