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Unformatted text preview: EAS 1600 Introduction to Environmental ciences Sciences Class 9 - The Greenhouse Effect In this class we explore the phenomena that causes the Earths surface temperature to be greater than its f ti t t effective temperature. Why? Remember from a previous lecture The greenhouse effect arises because: Th d th di t t diff t l th 1. The sun and earth radiate at different wavelengths. (Do you know why?) The greenhouse effect arises because: Th t h i t t t i ibl li ht b t 2. The atmosphere is transparent to visible light but absorbs infrared radiation. ote that the absorption is caused by specific gases; (Note that the absorption is caused by specific gases; these are the Earths greenhouse gases .) Figure from: Turco, R.P., Earth Under Siege: From Air Pollution to Global Change, Oxford University Press, New York, 527pp, 1997 Because of the presence of greenhouse gases: T effective T surface The radiative energy that leaves the planet and escapes space is determined by the temperature at which the to space is determined by the temperature at which the greenhouse gas radiates. This temperature is determined by the altitude where the concentration of the greenhouse gas is low enough to allow infrared radiation from below to escape to space....
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- Spring '08