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Week 12- Carbon Cycle

by: BettyAnn Mead

Week 12- Carbon Cycle Biology 152

BettyAnn Mead
GPA 3.6
Biology 152

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Biology 152
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This 2 page Class Notes was uploaded by BettyAnn Mead on Friday April 24, 2015. The Class Notes belongs to Biology 152 at University of Massachusetts taught by Peteh in Winter2015. Since its upload, it has received 88 views.


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Date Created: 04/24/15
Biology 152 04242015 Ecosystem Biogeochemical Cycles Nutrients cycle through a system Biogeochemical NUTRIENT ows are generated by ORGANISMS and GEOLOGICAL processes Global Climate Change 0 Three patterns 0 Increase in airborne carbon as C02 0 Increase in global temperature 0 Ocean acidi cation Mechanism What is the link The Carbon Cycle 0 Important terrestrial carbon sinks include o Forests 0 Peat lands 0 Permafrost Geological Sinks Over long periods of time 0 Biological carbon is converted to coal oil and gas 0 Marine organisms die and become ocean sediments and eventually turn into rocks limestone etc Carbon Cycle 0 Atmosphere contains large sink of carbon as C02 0 Plants absorb C02 and via photosynthesis convert it to carbohydrates 0 Animals metabolize carbohydrates and release carbon as C02 0 Sea surface absorbs and releases C02 in atmospheric sink 0 Marine organisms use carbon to build their bodied In addition carbon cycle through oceans in several forms 0 Carbon is sequestered as fossil fuels and in ocean sediments Humans release stored carbon by burning fossil fuels and cutting down forests Carbon Cycle Key Points 0 Carbon cycle through several compartments 0 Atmosphere 0 Oceans 0 Biological 0 Geological Some carbon is sequestered into sinks Humans are releasing carbon from geological sink faster then it is returned and can be absorbed by oceans How have atmospheric C02 concentration change over time 0 Since 1880 280 ppm to 390 ppm 0 During ice ages 100 ppm change took 10000 s of years How do we know CO2 is from human activity Volcanoes and C02 0 When volcanoes release magma this also releases C02 and other gases 502 etc o The best estimate is that volcanoes produce about 200 million tons of C02 annually 0 Volcanoes produce less than 1 of what humans do 1 Correlation between C02 increase and increase in use of fossil fuels 2 lsotope signature of atmospheric C02 lsotopes Some element different number of neutrons lsotopic signature of C02 from fossil fuels 0 Common isotope are 12C and 13C 0 Plants have a preference for the lighter isotopes 12C and 13C thus they have lower 13C12C ratio 0 Since fossil fuels all have roughly the same 13C12C ratio about 2 lower than that of the atmosphere 0 As C02 from these materials is released into and mixes with the atmosphere the average 13C12C ratio of the atmosphere decreases Why is the amount of CO2 increasing 0 Carbon Balance Carbon released into atmosphere Carbon absorbed by land ocean etc Carbon left in atmosphere


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