Lecture 38 Global C cycle2009 forweb

Lecture 38 Global C cycle2009 forweb - When Mon Dec 14 2:00...

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1 1 FINAL EXAM When: Mon. Dec. 14, 2:00 – 4:30 pm Where: Warren Hall, B45 Now Dec 14 2 % tree cover DeFries et al. Global Change Biol 6:247-254 The Global Carbon Cycle 3 Today’s Outline • How is the global C cycle changing? – Major pools in the global C cycle – Human perturbation of the global C balance • Three drivers of terrestrial C sinks –CO 2 itself – Atmospheric N deposition – Afforestation/regrowth 4 C Sink Definition : Net accumulation of carbon within a defined ecosystem over a particular time interval 5 Deep Ocean Deep Ocean 38,100 38,100 Atmosphere 750 750 Vegetation Vegetation 650 650 to 3 m depth Peatlands Peatlands 450 450 Permafrost 400 Other frozen soil 500 Litter 200 Upland Soil (to 3 m depth) 2300 2300 Surface Ocean 1020 1020 Global C Pools (Pg C) ~1990s Boxes are to scale (except deep ocean) 6 Deep Ocean Deep Ocean 38,100 Atmosphere Atmosphere 750 750 Vegetation 650 650 to 3 m depth Peatlands Peatlands 450 Permafrost 400 Other frozen soil 500 soil Litter 200 Upland Soil (to 3 m depth) (to 3 m depth) 2300 2300 Surface Ocean Surface Ocean 1020 Fire ~4 N P ~ 6 0 R h 5 Boxes are to scale (except deep ocean) Global C Pools (Pg C) ~1990s
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2 7 Deep Ocean 38,100 38,100 Boxes are to scale (except deep ocean) Atmosphere Atmosphere 750 750 Vegetation Vegetation 650 650 to 3 m depth Peatlands 450 450 Permafrost Permafrost 400 Other frozen soil 500 Litter 200 Upland Soil Upland Soil (to 3 m depth) 2300 Surface Ocean 1020 1020 Fire ~4 N P ~ 6 0 R h 5 Diffusive Exchange ~90 ~88 Global C Pools (Pg C) ~1990s 8 Deep Ocean Deep Ocean 38,100 Vegetation 650 to 3 m depth Peatlands Peatlands 450 450 Permafrost Permafrost 400 Other frozen soil 500 soil Litter 200 Upland Soil Upland Soil (to 3 m depth) (to 3 m depth) 2300 Surface Ocean Surface Ocean 1020 Fire ~4 Diffusive Exchange ~90 ~88 Fossil Fuel Reserves Fossil Fuel Reserves ~4000+ ~4000+ Global C Pools (Pg C) ~1990s ~6 Atmosphere Atmosphere 750 9 Deep Ocean 38,100 38,100 Atmosphere 590 590 Vegetation Vegetation 650 650 to 3 m depth Peatlands 450 450 Permafrost 400 Other frozen soil 500 Litter 200 Litter 200 Upland Soil (to 3 m depth) (to 3 m depth) 2300 Surface Ocean 1020 1020 Fire ~4 Diffusive Exchange ~90 ~88 Fossil Fuel Reserves ~4000+ Global C Pools (Pg C) ~1990s ~6 160 10 CO 2 emissions (PgC y -1 ) 9 8 7 6 1990 2000 2010 Growth rate: 1.0% per year Growth rate: 3.4% per year 2008 : Emissions: 8.7 PgC Le Quéré et al. 2009, Nature Geoscience; CDIAC 2009 Fossil Fuel Emissions and Cement Production 11 Raupach et al. 2007, PNAS, updated; Le Quéré et al. 2009, Nature Geoscience; International Monetary Fund 2009 1990 1995 2000 2005 2010 2015 Fossil Fuel Emission (GtC y 5 6 7 8 9 10 Projection A1B A1FI A1T A2 B1 B2 Carbon Dioxide Information Analysis Center
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Lecture 38 Global C cycle2009 forweb - When Mon Dec 14 2:00...

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