Greenhouse Gases and Energy Budget LP 3 1. What are the greenhouse gases? Where do they come from? How do they work? 2.

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Presentation transcript:

Greenhouse Gases and Energy Budget LP 3 1

What are the greenhouse gases? Where do they come from? How do they work? 2

3 What is a greenhouse? A house that is green? The White House?

A Greenhouse... 4

What is the greenhouse effect? 5

Composition of the Earth’s Atmosphere Nitrogen N 2 = 78 % Oxygen O 2 = 21 % Argon Ar = 0.9 % Other = <0.1% – Carbon Dioxide CO 2 – Methane CH 4 – Nitrous Oxide NO 2 – Ozone O 3 – Hydrogen 6

Greenhouse Gases 7 Carbon Dioxide Water Methane Nitrous Oxide Ozone

The “Goldilocks” Principle 8 Mars is too cold, Venus is too hot, but the Earth is just right!

What if Earth did not have greenhouse gases (GHG)? Main Greenhouse Gases CO 2 and H 2 O Temperature without GHG -5 °C (23 °F) Actual Average Temperature 15 °C (59 °F) Temperature change because of greenhouse gases 20 °C (36 °F) 9

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Frequency 12

More Complete (and complex!) Energy Balance Model Incoming Solar Radiation = Outgoing Radiation 13