the greenhouse effect what is the greenhouse effect? interaction between planet’s atmosphere,...
TRANSCRIPT
The Greenhouse Effect
• What is the greenhouse effect?• Interaction between planet’s atmosphere,
star’s light• Results in heating of planet
• What causes the greenhouse effect?• Surface absorbs high-energy light from Sun• Surface releases lower-energy light
(infrared)• Infrared light absorbed, re-emitted by gases• Increases gas’ energy; results in
temperature increase
Water on Earth
• Factors for liquid water• Distance from Sun (“Goldilocks Zone”)• Greenhouse effect (requires atmosphere)
• Earth’s atmosphere• 78% Nitrogen (N2)• 21% Oxygen (O2)• 1% trace gases• Carbon dioxide (CO2)• Water vapor (H2O)• And many others!
Image obtained from: http://www.solarviews.com/raw/earth/bluemarblewest.jpg
Greenhouse Gases
• N2, O2, not good greenhouse gases• Greenhouse gases efficient at absorbing
infrared light• Most important greenhouse gases in
atmosphere:• H2O• CO2
• CH4 (methane)
Image obtained from: http://www.interiordesigninspiration.net/wp-content/uploads/2013/08/Greenhouse-Construction-116.jpg
Global Warming
• Gradual increase in global average temperature• 1°C since 1900
• Are human activities causing global warming?• What other factors can affect
global temperatures?• Does global warming affect
peoples’ lives?
Global Warming: Temperature Variation
Global Warming: What You Need To Know
Video obtained from: https://www.youtube.com/watch?v=xcVwLrAavyA
Water on Earth
• Factors for liquid water• Distance from Sun (“Goldilocks Zone”)• Greenhouse effect (requires atmosphere)
• Earth’s atmosphere• 78% Nitrogen (N2)• 21% Oxygen (O2)• 1% trace gases• CO2
• H2O• And many others!
The Greenhouse Effect
• What is the greenhouse effect• Interaction between planet’s atmosphere,
star’s light• Results in heating of planet
• What causes the greenhouse effect?• Surface absorbs high-energy light from Sun• Surface releases lower-energy light
(infrared)• Infrared light absorbed, re-emitted by gases• Increases gas’ energy; results in
temperature increase
Water on Earth
• Factors for liquid water• Distance from Sun (“Goldilocks Zone”)• Greenhouse effect (requires atmosphere)
• Earth’s atmosphere• 78% Nitrogen (N2)• 21% Oxygen (O2)• 1% trace gases• CO2
• H2O• And many others!