Atmospheric Heating

1. Atmospheric Heating Radiation: Energy Transfer by electromagnetic waves from the sun Conduction: transfer of energy through a material • Transfer of energy is from warm to cold areas Convection: transfer of energy by the movement of a liquid or gas

2. Cold air is more dense than warm air, so cold air sinks and warm air rises producing convection currents.

3. Energy from the sun is absorbed by the atmosphere, land and water and is changed into thermal energy.

4. Greenhouse Effect Gases function like the glass walls and roof of a greenhouse, which allow solar energy to enter but prevent thermal energy from escaping. Gases in the atmosphere like water vapor and carbon dioxide absorb thermal energy from the sun and radiate it back to Earth.

5. Gases in the atmosphere like water vapor and carbon dioxide absorb thermal energy from the sun and radiate it back to Earth.

6. Radiation Balance:balance between incoming energy and outgoing energy Solar energy that is absorbed by the earth and its atmosphere is returned to space as thermal energy.

7. Global Warming • An increase in global temperature caused by an increase of greenhouse gases in the atmosphere. Greenhouse gas- a gas that absorbs thermal energy in the atmosphere Ex. Water vapor, carbon dioxide

8. What is a greenhouse gas?

9. A greenhouse gas is a gas that absorbs thermal energy in the atmosphere.

10. Global warming cause Human activities like: • Burning of fossil fuels • Deforestation (cutting trees) Such activities will increase levels of greenhouse gases such as carbon dioxide in the atmosphere and will cause temperatures to rise.