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What is this lecture about Ozone, Aerosols and their Precursors

Delve into ozone and aerosol chemistry, focusing on VOC chemistry, aerosol formation mechanisms, source apportionment, and radical reactions. Explore regional, global scales, and UTLS region. Learn about ozone production and destruction in different NOx environments through laboratory, field work, and modeling.

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What is this lecture about Ozone, Aerosols and their Precursors

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  1. What is this lecture aboutOzone, Aerosols and their Precursors Ozone chemistry in more depth (Processes on regional scale, global scale, upper troposphere / lower stratosphere region (UTLS) More systematic representation of VOC chemistry (a more detailed look at functional groups (e.g. acids, alcohols) Formation mechanisms of aerosols in the atmosphere including links of gasphase and aerosol chemistry Source apportionment of particulate matter Lecture based on laboratory, smogchamber, field, monitoring, modelling, and statistical experiments and analyses

  2. Starting point

  3. Schematic of OH oxidation chain and termination reaction O3 hu HNO3 H2O2 O2 NO2 NO HO2 NO2 OH HO2 carbonyl product VOC RO2 RO O2 O2 reaction, decomposition or isomerisation HO2 NO NO2 RO2 NO NO2 ROOH RONO2 RO2NO2 ROH + R-HO

  4. Average contribution of different sources to PM1

  5. Nitrogen containing molecules in particles NH3 SO2 H2SO4 NH4HSO4 NH4NO3 (NH4)2SO4 In addition: Amines, Aminoacids that are probably mainly due to primary biological particles +NO2 +NO RO2NO2 RONO2 RO2NO2 RONO2 Blue: particulate phase nitrogen containing products

  6. How is ozone produced ? Are the ozone concentrations highest in the urban areas, where the precursor emissions are? What happens to ozone if nitrogen oxide concentrations are very high (during day and night) ?! What happens to ozone due to chemistry if nitrogen oxide concentrations are very low like in the southern hemisphere ?! What does NOx and VOC limited ozone production mean? Which reactions are decisive for the distinction?

  7. Production of ozone

  8. Ozone destruction at very low NOx concentrations Ozone production NO + RO2 NO2 .. O3 Ozone destruction O3 O2 + O (1D) .. O(1D)+H2O HO2 + O3 OH + 2 O2 OH + O3 HO2 + O2

  9. Main radical reaction paths in VOC and NOx sensitive ozone production regimes

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