Lecture 9 - The Greenhouse Effect

Lecture 9 - The Greenhouse Effect - EAS 1600 Introduction...

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EAS 1600 Introduction to Environmental Sciences Lecture 9 - The Greenhouse Effect In this class we explore the phenomena that causes the Earth’s surface temperature to be greater than its effective temperature.
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Remember from previous lectures Temperature of an object in the solar system is essentially determined by an energy balance with solar radiation. The surface temperature of the Earth is significantly lower than calculated from simple radiation balance. The warming of the surface is the “Greenhouse Effect”
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Remember Venus has the thickest atmosphere
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Atmospheric Composition Earth Mars Venus Nitrogen 78% 1.9 3.5 Oxygen 21% 0.13 0 Argon 0.9% 1.6 0 Water 0-4% 0.0003 0.0000 Carbon Dioxide 0.038% 95 96.5 Methane 0.00017% 0.0 0.0 Surface Temperature 13 C -53 459 Pressure at Surface 1 atm/bar 0.0006 90
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Temperature variations of Earth, SP, Moon, and Mars
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Surface Temperatures Venus has a very thick (~90 atm) atmosphere and has a large Greenhouse Effect i.e. very high surface temperatures. The Moon has no atmosphere and is colder than the Earth on average but has huge variations in temperature. However, the sunlight impacting the moon is very similar to that impacting the Earth. Mars has a thin atmosphere and has a small
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Lecture 9 - The Greenhouse Effect - EAS 1600 Introduction...

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