BIOB 370 1st Edition Lecture 11Outline of Last Lecture I. Requirements of PS A. + trade-offsII. Trade-offs of adaptive evolutionIII. LIAIV. Photosynthetic rateOutline of Current Lecture V. Photosynthesis B. ReductionVI. CO2 EmissionsVII. Carbon CyclesVIII. Greenhouse GasesCurrent Lecture*Quiz Wendsday* Photosynthesis: CO2 + H2O (Light) CH2O + O2Reduction Oxidation CH2O Terrestrial, Coal (terrestrial reduction)CH2O Marine environments, shallow marine, Oil Methane – natural gas – Carbons fully reduced by these geological processes Milankovich cycles – Solar constant, 1376 W/m^2Changes in CO2 Emissions – Valleys show ice ages Fast Carbon Cycle- Terrestrial organic Atmosphere- Can be seen clearly in Keeling Curve Atmosphere78% atmosphere – N221% - O20.0399% - CO2OH 6:- CO2 released from Land by photosynthesis- CO2 released from Ocean also by photosynthesis yet H2O + CO2 H2CO3 H+ + HCO3- (when CO2 is absorbed back into the ocean, it becomes more acidic)- 9 Gton/year of CO2 is added to the atmosphere, 5 Gton offset by the absorbance by plants and oceans so 4 Gton/year – slower process and not as dramatic o Represents 0.67% increase per yearo So how long will it take to double? CO2 e^growth rate x t = CO2 e^0.006t = ~115 yearsGreenhouse Gasses Interaction of gas molecules with EM Radiation:- Incoming-
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