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CHEM 304 – 2/27/12

CHEM 304 – 2/27/12. I.D. Tropospheric chemistry: - biogenic compounds & sources - anthropogenic compounds & their sources - OH: NOx , O 3 ,CO —> then the “big picture” READ Ch . #3, Ch. #5 , & appendix on org. chem . The detailed stuff we covern next is in #5.

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CHEM 304 – 2/27/12

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  1. CHEM 304 – 2/27/12 I.D. Tropospheric chemistry: - biogenic compounds & sources - anthropogenic compounds & their sources - OH: NOx, O3,CO —> then the “big picture” READ Ch. #3, Ch. #5, & appendix on org. chem. The detailed stuff we covern next is in #5.

  2. Trace gases - Natural Sources … And LOTS of VOC’s from plants …

  3. 5 possible fates of a compound introduced into the troposphere: • Dry deposition: direct absorption on plants or in soils, etc. • Wet deposition or “rainout”: dissolve –> precip. • Transport to Stratosphere: Long lifetime! • Photochemistry: l > 300 nm only (NO2, O3) • Reaction with OH: this is the primary chemical loss path (and the end result is ultimately oxidation)

  4. Pictorial view of Basic Tropospheric Chemistry …

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