2-10 climate change slides

2-10 climate change slides - ClimateChange ENV200H1S...

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Climate Change V200H1S bruary 10 2011 ENV200H1S February 10 2011 1
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Announcements textbook available at UofT bookstore torial #2 ir Share of Resources (Tragedy of the Tutorial #2 – Fair Share of Resources (Tragedy of the Commons) this week idterm next week: Tuesday Feb 15 2011 Midterm next week: Tuesday, Feb 15, 2011 A H: Med Sci auditorium EX200 (exam facility at 255 cCaul I – Z: EX200 (exam facility at 255 McCaul) 2
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utline Outline lobal Climate Change Global Climate Change Greenhouse gases arbon cycle: pools & fluxes Carbon cycle: pools & fluxes Impacts idterm Outline Midterm Outline 3
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HGs & Global limate Change GHGs & Global Climate Change Greenhouse gases (GHGs) absorb infrared radiation warms atmosphere We are increasing concentrations of these gases 4
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Causes of the Enhanced Greenhouse Effect it t ft t f itt d Two important factors: amount of gas emitted and properties of the gas Average residence time: length of time gas resides in the atmosphere Global warming potential: how much given mass of greenhouse gas contributes to global i id f ti d t warming over a period of time compared to the same mass of carbon dioxide 5
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Greenhouse Gases & Climate Change **Water vapour and ozone (O3) are also important GHGs 6
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Therefore, understanding (and predicting) how atmospheric CO 2 levels (and climate) may change in the future, means we need to nderstand where carbon is stored understand where carbon is stored and how it moves around. 7
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Carbon Cycle 8
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5 significant pools in the carbon cycle 1. Atmosphere (785 Gt in 2008 or ~385 pm) ppm) 2. Forests/Soils (610 Gt/1580 Gt) 3. Surface ocean (1,020 Gt) 4. Deep ocean (38, 100 Gt) . ssil Fuel (5,000 5. Fossil Fuel (5,000 Gt) The pools are not as important as the fluxes!
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arbon Fluxes Carbon Fluxes hotosynthesis/respiration Photosynthesis/respiration Changing land use, e.g. Deforestation, forest growth regrowth Surface ocean flux Flux to the deep ocean Fossil fuel 10
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Atmospheric CO 2 at Mauna Loa (ppm) s of September 2009 atmospheric CO As of September 2009, atmospheric CO 2 was 385 ppm 11
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GT.y -1 12 Carbon flux (Gt.y -1 )
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2-10 climate change slides - ClimateChange ENV200H1S...

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