To be 16 05 to 27 gtc 59 18 to 99 gtco2 per year

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Unformatted text preview: in terms of the mean and variability of relevant quanOOes over a period of Ome ranging from months to thousands or millions of years. The classical period is 30 years, as defined by the World Meteorological OrganizaOon (WMO). So, weather is the day to day or month to month result of climate and is much more variable. to be 1.6 [0.5 to 2.7] GtC (5.9 [1.8 to 9.9] GtCO2) per year over the 1990s, although a large uncertainty. {7.3} The composiAon of our atmosphere is changing due to human acAvity. IPCC 2007 We are releasing 7.6 billion tons of CO2 through burning of fossil fuel every year and the rate is increasing Pg stands for Petagram, and is the same as a Gigaton (Gt) = 1,000,000,000 tons Anthropogenic C Emissions: Fossil Fuel 2006 Fossil Fuel: 7.6 Gt C Atmoapheric [CO2] (ppmv) Fossil Fuel Emission (GtC/y) [2006-Total Anthrop. Emissions:7.6+1.5 = 9.1 Gt] 9 Emissions 8 7 6 5 4 3 2 1 0 1850 1850 400 1870 1870 380 1890 1890 1910 1910 1930 1930 1950 1950 1970 1970 1990 1990 2010 2010 [CO2] 360 340 Raupach et al. 2007, PNAS; Canadell et al 2007, PNAS 320 300 2 ppm/year GPP = all organic C (sugars) produced by phot...
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This note was uploaded on 01/30/2014 for the course IB 105 taught by Professor Caceres during the Fall '08 term at University of Illinois, Urbana Champaign.

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