may 5 - radicals • Each of these can go on to react with...

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Outline NOx chemistry Adding organics to the picture…
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Outline… Complexity of organics Importance of vapor pressure Reactions (products?) Sources Lifetimes… Sinks (loss processes) Homogeneous reactions Heterogeneous reactions
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NO 3 concentrations peak at night
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Lifetimes vs spatial distribution vs. hemispheric mixing
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Cycling of NO x compounds
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What time do concentrations peak? How do conversions occur?
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Complexity of organic species in the atmospheric
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Goldstein, 2007, ES&T
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Sources Atmospheric VOC’s Sinks Oxidation (particles) Wet/dry deposition Trees Combustion Secondary oxidation of particle species
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Anthropogenic VOC Sources
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Isoprene ~1/2 total biogenic VOC emissions
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Isoprene Chemistry (+ OH) OH can add to 4 different positions With OH addition and O 2 addition—get 6 different peroxy
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Unformatted text preview: radicals • Each of these can go on to react with NO, HO 2 , RO 2 …. • What is the primary source of NO in the atmosphere? • Fossil fuel combustion (nearly 50% in urban atmospheres)…. • How do you get to NO 2 from NO? • O 3 + NO → NO 2 + O (significant concentrations of NO and O 3 cannot coexist) • Also….RO 2 + HO 2 reactions • What can happen to NO 2 once it is formed? NO 2 + OH → HNO 3 NO 2 + NO 3 → N 2 O 5 → (react with H 2 O to form?) (night or day?) NO 2 + O 3 → NO 3 + O 2 NO 2 + h → NO + O ( 1 D) What happens to O( 1 D)? Reacts with H 2 O to produce 2OH (~10%) OR collides with “M” and loses energy to form O( 3 P) What then happens to O( 3 P)? Reacts with O 2 + M to (re-)form ozone...
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This note was uploaded on 10/28/2010 for the course CHEM 173 taught by Professor Dr.dancziczo during the Spring '10 term at UC Riverside.

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may 5 - radicals • Each of these can go on to react with...

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