1. The Carbon Cycle Tyler Szwarc and Eliana Manangon http://www.physicalgeography.net/fundamentals/images/carboncycle.jpg

2. Atmosphere Primarily in the form of CO 2 and smaller amounts of CH 4 Reservoir: ~ 6 x 10 14 kg Flux: 1.25 x 10 12 kg/yr 2 yrResidence time: 4 x 10 2 yr –Residence time is highly variable due to nature of atmosphere and its relationship to other reservoirs

3. http://www.newworldencyclopedia.org/entry/Carbon_cycle Hydrosphere Inorganic carbon exchange controls the pH C is exchanged between the hydrosphere and atmosphere Dissolved Ca +2 and carbonate ions are used by shells and crustaceous to build their skeletons Oceans have 3.8 x10 16 kg C Flux = ~2.2 x 10 12 kg/yr Residence Time = 1.7 x 10 4 yr Takahashi et.al, Global sea–air CO 2 flux based on climatological surface ocean pCO2, and seasonal biological and temperature effects, Deep-Sea Research, volume II issue 49, 2002, pp 1601–1622.

4. Lithosphere Reservoirs: Sedimentary rock, fossil fuels, and plants (1 x 10 20 kg total) Flux assumptions: –Carbon rich sedimentation occurring on 25% of Earth’s surface –Accumulates at 0.2 mm/yr, 2710 kg/m 3 –Carbon accounts for ~12% of total rock mass –Flux = ~8.2 x 10 12 kg/yr Residence Time = 1.2 x 10 7 yr

5. ReservoirSize (10 16 kg) Flux (10 12 kg/yr) Residence Time (yr) Atmosphere0.05-0.081.254 x 10 2 Ocean3.802.21.7 x 10 4 Lithosphere6,600 – 10,0008.21.2 x 10 7 Fossil Fuel0.40^^ Soil0.15^^ Plants0.05^^ Reservoirs, Flux, and Residence Times Pidwirny, M. (2006). "The Carbon Cycle". Fundamentals of Physical Geography, 2nd Edition. Date Viewed. http://www.physicalgeography.net/fundamentals/9r.html