april 30 - Predicting the fate of an atmospheric gas...

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Unformatted text preview: Predicting the fate of an atmospheric gas Anthropogenic Sources of NOx Schematic of tropospheric NOx reactions Cycling of NOx compounds NO3 concentrations peak at night Global cycle of nitrogen oxides Source: Turco With no anthropogenic sources! Altitude dependence What time do concentrations peak? How do conversions occur? Goldstein, 2007, ES&T •Isoprene ~1/2 total biogenic VOC emissions Isoprene Chemistry (+ OH) •OH can add to 4 different positions •With OH addition and O2 addition—get 6 different peroxy radicals •Each of these can go on to react with NO, HO2, RO2…. Anthropogenic VOC Sources •What is the primary source of NO in the atmosphere? •Fossil fuel combustion (nearly 50% in urban atmospheres)…. •How do you get to NO2 from NO? •O3 + NO → NO2 + O (significant concentrations of NO and O3 cannot coexist) •Also….RO2 + HO2 reactions •What can happen to NO2 once it is formed? NO2 + OH → HNO3 NO2 + NO3 → N2O5 → (react with H2O to form?) (night or day?) NO2 + O3 → NO3 + O2 NO2 + h → NO + O (1D) What happens to O(1D)? Reacts with H2O to produce 2OH (~10%) OR collides with “M” and loses energy to form O(3P) What then happens to O(3P)? Reacts with O2 + 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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april 30 - Predicting the fate of an atmospheric gas...

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