Lecture 4 - Greenhouse Gases/Carbon Cycle Greenhouse gases...

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Greenhouse Gases/Carbon Cycle Greenhouse gases absorb outgoing IR radiation the greenhouse effect may provide a link between the anthropogenic production of greenhouse gases and recent climate change
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Greenhouse Gases/Global Carbon Cycle Questions to address today: What are the anthropogenic greenhouse gases? other gases besides CO 2 ? How effective are they for IR absorption? How much of these gases is there? What factors determine their rate of accumulation in the atmosphere? For CO 2 : must consider the global carbon cycle 2
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Greenhouse Gases/Carbon Cycle What are the major greenhouse gases? CO 2 (carbon dioxide) CH 4 (methane) NO 2 (nitrous oxide) O 3 (ozone) CFC’s (chloroflurocarbons) All except CFC’s have both natural and anthropogenic inputs ( CFC’s are anthropogenic only )
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Greenhouse Gases/Carbon Cycle CO 2 CH 4 NO 2 O 3 CFC’s Greenhouse Gas 374 ppm 172 ppm 312 ppb 51 ppb 1.3 ppb Concentration in atmosphere 0.5% 1% 0.2% 0.5% 8% Increase per year 60% 15% 5% 8% 12% Contribution to total greenhouse effect 1 25 200 2000 15000 IR Absorption relative to CO 2 2001 data CFC’s very important despite low levels
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Greenhouse Gases/Carbon Cycle Factors determining the rate of increase of greenhouse gases Atmosphere inputs (sources) losses (sinks) Accumulation rate = rate of input - rate of losses Not steady state condition
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Greenhouse Gases/Carbon Cycle Atmosphere
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This note was uploaded on 12/16/2009 for the course BIOPL 2400 taught by Professor Silva,t. during the Fall '08 term at Cornell University (Engineering School).

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Lecture 4 - Greenhouse Gases/Carbon Cycle Greenhouse gases...

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