Presentation is loading. Please wait.

Presentation is loading. Please wait.

17.2 Heating the Atmosphere

Similar presentations

Presentation on theme: "17.2 Heating the Atmosphere"— Presentation transcript:

1 17.2 Heating the Atmosphere

2 Energy Transfer as Heat
Heat is the energy transferred from one object to another due to the difference in their temperatures Electromagnetic Waves 3 mechanisms of energy transfer as heat: Conduction Convection Radiation

3 Conduction Transfer of heat through matter by molecular activity
Energy is transferred by the molecules colliding into each other Ex) a hot metal spoon that was left in a hot pan Metals are good conductors of heat Air is a poor conductor of heat

4 Convection Much of the heat transfer in the atmosphere
Transfer of heat by mass movement or circulation within a substance Takes place in fluids (ocean and air) Takes place in solids (Earth’s mantle)

5 Radiation Travels out in all directions from it source
Unlike conduction & convection, which need material to travel through, radiant energy can travel through the vacuum of space. Solar energy reaches Earth by radiation


7 4 Laws Governing Radiation
1. all objects, at any temperature, emit radiant energy 2. Hotter objects radiate more total energy per unit area than colder objects do 3. The hottest radiating bodies produce the shortest wavelengths of maximum radiation 4. Objects that are good absorbers of radiation are good emitters as well.


9 What Happens to Solar Radiation?
When radiation hits an object 3 different things could happen: Some energy is absorbed by the object Substances such as water & air are transparent to certain wavelengths of radiation Some radiation may bounce off the object without being absorbed or transmitted

10 Reflection, Scattering, & Absorption
Reflection: occurs when light bounces off an object. The reflected radiation has the same intensity as the incident radiation. Scattering: produces a larger number of weaker rays that travel in different directions. Disperses light forward & backwards Absorption: without the absorbing gases in the atmosphere, we would not be able to live on Earth due to the Greenhouse Effect


12 17.3 Temperature Controls

13 Why Temperatures Vary Factors other than latitude that exert a strong influence on temperature include heating of land & water, altitude, geographic position, cloud cover, & ocean currents Land heats more quickly & to higher temps. than water. And land cools quicker than water and to a lower temp. Geographic Position Altitude Cloud Cover & Albedo

14 World Distribution of Temperature
Isotherms are lines that connect points that have the same temperature. Study global temperature patterns & the effects of the controlling factors of temperature

Download ppt "17.2 Heating the Atmosphere"

Similar presentations

Ads by Google