SIO40lecture11

SIO40lecture11 - SIO 40 Life and Climate on Earth Oct. 22,...

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SIO 40 – Life and Climate on Earth Oct. 22, 2010 Lecture 11 – Carbon Cycle Part I – The Biosphere
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Lecture Outline The global biosphere Annual cycles in CO 2 Global primary production Terrestrial vs marine carbon cycle Organic carbon cycle - timescales
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The Global Biosphere NASA SeaWiFS image Terrestrial component – green colors correspond to greater vegetation cover, brown areas less vegetation. Oceanic component – green/orange/red correspond to higher concentrations of chlorophyll in surface waters, a proxy for algal biomass. Blue/purple areas have lowest algal biomass.
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See http://www.youtube.com/watch?v=0hAiaQGHOQI for video loop similar to that shown in class A 6-year loop of satellite biomass measurement shows annual cycling
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http://www.gsfc.nasa.gov/topstory/20010327page2.html The seasonal nature of the terrestrial carbon cycle is revealed by detailed records of atmospheric CO 2 Atmospheric CO2 concentration (ppmv) CO 2 exchange with terrestrial ecosystems creates annual pulses in atmospheric CO 2 , as measured in the northern hemisphere. Atmospheric CO 2 decreases in spring and summer as plants grow and photosynthesize, drawing down CO 2 . As plants die off in fall and winter, atmospheric CO 2 rises again due to heterotrophic respiration. The amplitude of this cycle is greatest in the northern hemisphere because of the greater continental land mass relative to the southern hemisphere.
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Global annual primary production in units of grams C per square meter per year Field et al., Science 1998 For the terrestrial biosphere, note the high productivity of the rainforests and low productivity of the deserts. For the oceans, note that the central ocean gyre regions are least productive, while coastal and high latitude areas are more productive.
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This note was uploaded on 05/02/2011 for the course SIO 40 taught by Professor Barbeau,k during the Fall '08 term at UCSD.

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SIO40lecture11 - SIO 40 Life and Climate on Earth Oct. 22,...

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