ESM202Lecture01

ESM202Lecture01 - Environmental Biogeochemistry John Melack...

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    ESM 202 Environmental  Biogeochemistry John Melack and Trish Holden
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    Objectives Apply biogeochemical understanding to  important environmental issues Understand SOURCES, RESERVOIRS and  PROCESSES of pollutants and nutrients Provide basic biogeochemical knowledge for  making sound environmental decisions
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    Relevance Management of nutrients in a watershed  to avoid eutrophication Develop a sound environmental  restoration program Design a successful remediation  program for contaminated site Understand the greenhouse effect, its  drivers and the possible solutions
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    Terminology Reservoir (M): an amount of material defined  by physical, chemical or biological  characteristics. There may also be physical  boundaries. Examples: carbon in the atmosphere (CO 2 , CO, CH 4 , VOCs,  etc.) nitrogen in soil (NH 4 + , NO 3 - , DON, etc.) sulfur in sedimentary rocks (as S, SO 4  or S 2-  ,  bound as FeSO 4 , FeS) phosphorous in lake water (as P, or PO 4 2- )
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    Terminology Flux (F): the amount of material  transferred from one reservoir to  another per unit time (m L -2  t -1 ) carbon dioxide to atmosphere from  combustion of fossil fuels nitrogen deposition from the atmosphere to  land phosphate leaching out of the soil into  rivers VOC emissions from human activities into  the atmosphere or to groundwater
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    Terminology Process: A physical, chemical or  biological activity that results in a flux or  change in mass or chemical form: evaporation photosynthesis oxidation  (CH 4  in atmosphere) biodegradation
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    Terminology Cycle
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