L12.2

L12.2 - 2) Rainwater transports CO2 to oceans and lakes 3)...

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The Greenhouse Effect – the process by which sunlight gets re-radiated into the atmosphere as IR and reheats surface 1) Sunlight emits in optical (UV + IR) 2) Atmosphere only allows optical light through 3) Warms up surface 4) Beings to glow in IR 5) IR re-radiated into troposphere 6) Troposphere blocks IR, reheats Earth Without it: - Earth at ~-10° F - No liquid water - NO LIFE Carbon Cycle – (CO2) Period ~400,000 years 1) Major greenhouse gas 2) Can dissolve in H2O (60x more CO2 in H2O than atmosphere) 3) Can dissolve in rocks (6000x more CO2 in rocks than water) Steps 1) CO2 in atmosphere dissolves in rainwater
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Unformatted text preview: 2) Rainwater transports CO2 to oceans and lakes 3) Dissolved CO2 reacts with calcium, forms carbonate rocks on ocean floor 4) Plate tectonics carries carbon-rich rocks to subduction zones 5) As rocks melt in mantle, CO2 out-gassed back into atmosphere EARTH WARMING MORE H2O IN ATMOSPHERE MORE CO2 DISSOLVES IN RAIN/OCEAN WATER (LESS CO2 IN ATMOSPHERE) LOWER GREENHOUSE EFFECT EARTH COOLING LESS H2O IN ATMOSPHERE LESS CO2 DISSOLVED IN WATER, MORE IN ATMOSPHERE HIGHER GREENHOUSE EFFECT EARTH WARMING...
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This note was uploaded on 02/17/2010 for the course PHY 115 taught by Professor Weinbeck during the Spring '09 term at BC.

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