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Diurnal Cycles And Background Concentrations Of Atmospheric Gases From Traffic: A Tunnel Study In Paris.pdf

acp-14-12871-2014-supplement.pdf
Preview of Diurnal Cycles and Background Concentrations of Atmospheric Gases from Traffic: A Tunnel Study in Paris
🔗 Source: acp.copernicus.org
📊 Size: 393 KB
📄 Pages: 4 pages
⬇️ Downloads: 110

Summary

This study investigates atmospheric measurements of carbon dioxide (CO2) and its co-emitted species in a tunnel located in Paris, providing insights into traffic-related emissions. The research includes:

- Mole Fraction Variations: Mole fractions of various compounds, including CO2, CO, NO, NO2, aromatic hydrocarbons, acetylene, alkenes, and alkanes, exhibit significant diurnal cycles, with amplitudes varying by compound.

- Background Concentration Comparison: Two options for background levels are considered: nighttime concentrations and daytime concentrations outside traffic peaks. Nighttime concentrations are found to be less variable but potentially less representative of daytime conditions.

- Corrected Concentrations: The researchers correct tunnel concentrations during traffic peaks using interpolated ambient air data from outside the tunnel as a background reference. This approach allows for a more accurate analysis of co-emitted species ratios relative to CO2.

- Ratio Analysis: By evaluating the correlation between changes in CO and CO2 (ΔCO and ΔCO2), the study determines the ratio ΔSpecies/ΔCO2, which remains consistent across different background concentration options, confirming the robustness of the findings.

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Description

This supplement provides detailed diurnal cycle data for various atmospheric species, including CO2, CO, NO, NO2, benzene, toluene, and xylenes, measured in a Paris tunnel, highlighting significant variations over the day.

Technical Information

  • File Format: PDF
  • File Size: 393 KB
  • Pages: 4
  • Language: EN
  • Total Downloads: 110
  • Last Updated: 2 weeks ago

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