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

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Presentation on theme: "Greenhouse Gases and Energy Budget LP 3 1. What are greenhouse gases? Where do they come from? How do they work? 2."— Presentation transcript:

1 Greenhouse Gases and Energy Budget LP 3 1

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

3 If the amount of energy that comes in to Earth is the same amount of energy that goes out of Earth, how can our planet stay warm? 3

4 A greenhouse... 4

5 What is the greenhouse effect? 5

6 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

7 Greenhouse Gases 7 Carbon Dioxide Water Methane Nitrous Oxide Ozone

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

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

10 10

11 11

12 Frequency 12

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


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