Journal
ATMOSPHERIC CHEMISTRY AND PHYSICS
Volume 16, Issue 24, Pages 15653-15664Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/acp-16-15653-2016
Keywords
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Funding
- IPSL (Institut Pierre Simon Laplace)
- Ville de Paris
- CNRS
- CEA
- UVSQ
- MEGAPOLI project
- CO2-MegaParis project
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We propose an approach to estimate urban emission ratios that takes advantage of the enhanced local urban signal in the atmosphere at low wind speed. We apply it to estimate monthly ratios between CO2, CO and some VOCs from several atmospheric concentration measurement datasets acquired in the centre of Paris between 2010 and 2014. We find that this approach is not very sensitive to the regional background level definition and that, in the case of Paris, it samples all days (weekdays and weekends) and all hours of the day evenly. A large seasonal variability of the Delta CO / Delta CO2 ratio in Paris is shown, with a difference of around 60% between the extreme values and a strong anti-correlation (r(2) = 0.75) with atmospheric temperature. The comparison of the ratios obtained for two short measurement campaigns conducted in two different districts and two different periods (autumn and winter) shows differences ranging from -120 to +63 %. A comparison with a highly resolved regional emission inventory suggests some spatial variations of the ratio within the city.
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