Lec8 Climate I - Global Climate Change I Chapter 3 Chemistry in Context Radiation emitted from Sun and Earth Basic Principles 1 Everything emits

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Global Climate Change I Chapter 3: Chemistry in Context
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Radiation emitted from Sun and Earth Hot Sun Low Wavelengths Emitted Cooler Earth High Wavelengths Emitted Basic Principles: 1) Everything emits “light” 2) Wavelength 1/Temperature
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Earth’s Energy Balance I UV VIS ( IR) IR
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Earth’s Energy Balance II HEATING From Sun: Absorbed UV, VIS, IR by atmosphere Absorbed UV, VIS, IR by surface From Earth: Absorbed IR by atmosphere COOLING Reflection of Sun’s radiation to space Escape of Earth’s radiation to space “Greenhouse” Effect
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Greenhouse Effect Light (UV-A, VIS) passes through glass Light is absorbed by interior surfaces Surfaces heat up Surfaces emit IR radiation IR radiation is absorbed by glass Glass heats up and emits IR radiation Some of the IR radiation is emitted back inside where it came from and is effectively “trapped”. Temperature inside increases because not all energy entering through the glass escapes back out of the glass UV-A, VIS IR IR UV-A, VIS IR
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An “optimum” greenhouse effect is essential for life Without greenhouse heating, Earth’s temperature would be too cold Average temperature on Earth: 15 o C (59 o F) Temperature without greenhouse effect: -18 o C (0 o F) Too much heating is detrimental to life Average temperature on Venus: 450 o C Temperature without greenhouse effect: 100 o C The atmosphere of Venus is 96% CO 2
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This note was uploaded on 10/24/2011 for the course CHEM 100 taught by Professor Vanleer,m during the Spring '08 term at University of Delaware.

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Lec8 Climate I - Global Climate Change I Chapter 3 Chemistry in Context Radiation emitted from Sun and Earth Basic Principles 1 Everything emits

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