1. Atmospheric Heating

2. The Earth is warmed by the sun
Heat Energy Transfer
The Earth is warmed by the sun
Thermal energy (Heat energy) moves from hot objects to cold objects.

3. Radiation Conduction Convection Heat is transferred in 3 ways…
Heat Energy Transfer
Heat is transferred in 3 ways…
Radiation
Conduction
Convection

4. Radiation: Heat transfer through electromagnetic waves.
Heat Energy Transfer:
Radiation: Heat transfer through electromagnetic waves.
(rays from sun)

5. Heat Energy Transfer: Radiation
This energy moves through empty space or radiates out from heat sources.
Earth only receives about 2/1,000,000,000 ‘s of the energy that comes from the sun

6. Heat Energy Transfer: Radiation
Solar radiation drives our water and weather cycle and makes our planet habitable!

7. Heat transfer by touching
Heat Energy Transfer
2.Conduction
Heat transfer by touching

8. Heat Energy Transfer 2.Conduction
Air molecules transfer heat by touching other molecules
The Earth’s surface transfers it’s heat to the atmosphere through conduction

9. Heat transfer by circulation or movement of a liquid or gas
Heat Energy Transfer
3. Convection
Heat transfer by circulation or movement of a liquid or gas

10. Heat Energy Transfer 3. Convection
Heat transfer by circulation or movement of a liquid or gas
Heat energy in the atmosphere is transferred by convection

11. Cold air
sinks
Hot air rises
Convection Currents!!!

15. Earth’s Heat Energy Budget
The radiation balance (energy in must equal energy out!)
For the Earth to remain livable we must balance our energy
Too much coming in, warms us too much
Not enough coming in, cools us too much

16. Earth’s Heat Energy Budget
The Earth must also give off heat energy to keep the balance
This balance between energy out and energy in is called the radiation balance.

18. Greenhouse Effect
70% of the energy that enters the Earth’s atmosphere is absorbed by clouds and the Earth’s surface
This energy turns into heat and keeps the planet warm
Our atmosphere acts like a warm blanket and keeps the heat in

19. Greenhouse Effect
Greenhouse Effect--The process by which gases in the atmosphere (water vapor and carbon dioxide) absorb thermal energy and radiate it back to the Earth

20. Global Warming
Over the last 100 years the average temperature of the planet has increased.
Some scientists believe that our planet is warming due to the increase of gases that trap heat (Carbon Dioxide, Methane)
Other scientists believe this is a natural cycle our planet goes through (ice ages and warming periods)

21. Earth’s Surface
Sun