the greenhouse effect (8.6). the greenhouse effect how does the climate system trap energy to keep...
Post on 02-Jan-2016
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The Greenhouse Effect How does the climate system trap
energy to keep Earth warm? Gases in the atmosphere absorbed the IR
radiation emmitted by the earth and radiate it in all directions
Half gets sent back to earth to warm it up even more
The energy trapping process is called the greenhouse effect!
Greenhouse gasesMAJOR Carbon Dioxide
0.0385% of atmosphere (not a lot!) Causes ¼ of natural greenhouse effect Natural sources: volcanoes, burning organic matter, cell respiration
Water Vapour 2/3 of Earth’s natural greenhouse effect Amount varies from very little to 4% of atmosphere
MINOR Methane
Much less in atmosphere but 23x more effective than CO2 Natural sources: plant decomposition
Ozone Acts as greenhouse gas in troposphere
Nitrous Oxide Very little in atmosphere but 300x more effective than CO2 Natural Source: reactions of bacteria in soil
Videos! https://www.youtube.com/watch?v=Hi3E
Res0h84
http://ed.ted.com/lessons/climate-change-earth-s-giant-game-of-tetris-joss-fong#review
Energy Transfer in the Atmosphere
Convection current: Air near the equator warms up, rises and
spreads and then the cooler air drops and the cycle repeats
This causes winds that are predictable Prevailing winds help push warm air and
water to the poles Another factor in determining climate
zones!
Energy Transfer in the Oceans
Thermohaline circulation: At the poles, surface water freezes and leaves
saltier colder water which is more dense and sinks to the bottom
This allows warmer surface water from the equator to flow to the poles
Acts as a conveyer belt carrying water from the equator to the poles
Ocean currents can also be caused by winds Have a strong effect on climates of land nearby
Warm water warm moist air warms land rain Cold water cool dry air cools land desert
https://www.youtube.com/watch?v=ajQ3hm5JidU
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