es 10 feb 2 global biochemical cycles

es 10 feb 2 global biochemical cycles - ES10 Lecture 7...

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ES10 Lecture 7 Global Biogeochemical Cycles Inez Fung Reading: http://earthobservatory.nasa.gov/Features/CarbonCycle/ http://www.enviroliteracy.org/subcategory.php/198.html
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What are the natural resources that support human populations? Recall: Earth was born as 3 rd planet from the Sun, with <100 natural occurring elements Atmospheric composition + large scale circulation environmental conditions (temperature, pressure, rainfall…) biological productive areas Major Points for Global Biogeochemical Cycles: All living things are made of chemical compounds Global biogeochemical cycles describe the cycling of biologically important elements among the 4 major reservoirs: atmosphere, hydrosphere, biosphere, and lithosphere (outer layer of solid earth)
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Major Global Biogeochemical Cycles
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4 Biogeochemical (BGC) Cycles BGC: focus on the cycling a single element – e.g. carbon, nitrogen Terms: Reservoirs, inventories, processes, fluxes, turnover/residence times, replacement times Element may exist as different compounds (inorganic/organic compounds, gaseous/ solids/dissolved) in different reservoirs Transformational processes may be physical, biological, chemical, geological The compounds have different roles and functions in different reservoirs Global: mass conservation, i.e. the total mass of the element in all the reservoirs remains constant
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Global Biogeochemical Cycles: Terms Reservoir A Reservoir B Flux_AB Flux_BA Term Synonym Definition example Reservoir Pool, box, compartment Atmosphere, ocean Inventory Pool size Mass of X in reservoir A Kg X Flux Flux_in, flux_out, flow Rate of gain or loss of X in reservoir A Kg X/year Turnover time of X in reservoir A Residence time Mass of X / flux out of A year Replacement time of X in reservoir A Mass of X / flux into A year Consider an element X (e.g. carbon) that may exist as various compounds in reservoir A and other compounds in reservoir B
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Global Carbon Cycle Questions:
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This note was uploaded on 08/01/2011 for the course PSYC 132 taught by Professor Phillip during the Spring '11 term at Arkansas.

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es 10 feb 2 global biochemical cycles - ES10 Lecture 7...

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