APES Unit 9.3 (Greenhouse Gases)

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7 Terms

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Where does solar radiation go when it hits Earth’s surface?

26% reflected back into space by clouds & atm.

19% absorbed by atm. & clouds & radiated out into space & down to earth

The rest reaches earth’s surface where it can be absorbed or reflected (depending on the albedo of the surface it strikes)

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Greenhouse effect

Gases in earth’s atmosphere trap heat from the sun & radiate it back down to earth

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How does the Greenhouse effect work?

Solar radiation strikes earth’s surface, heating it

Earth’s surface releases infrared radiation

GHGs absorb infrared radiation & radiate it both out into space and back towards earth

Portion coming back to earth is the “greenhouse effect”

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What are the most important GHGs?

CO2, Methane, Nitrous Oxide, CFCs/HCFCs/HFCs

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Why isn’t water vapor a GHG?

It doesn’t drive atmospheric temperature change

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What is Global Warming Potential (GWP)?

Measure of how much a given molecule of gas can contribute to the warming of the atmosphere over a 100 year period, relative to CO2

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What factors is GWP based on?

Residence time and Infrared Absorption

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