Articles | Volume 18, issue 5
https://doi.org/10.5194/acp-18-3335-2018
https://doi.org/10.5194/acp-18-3335-2018
Research article
 | 
07 Mar 2018
Research article |  | 07 Mar 2018

Diurnal, synoptic and seasonal variability of atmospheric CO2 in the Paris megacity area

Irène Xueref-Remy, Elsa Dieudonné, Cyrille Vuillemin, Morgan Lopez, Christine Lac, Martina Schmidt, Marc Delmotte, Frédéric Chevallier, François Ravetta, Olivier Perrussel, Philippe Ciais, François-Marie Bréon, Grégoire Broquet, Michel Ramonet, T. Gerard Spain, and Christophe Ampe

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Cited articles

ADP: Aéroports de Paris, available at: http://www.aeroportsdeparis.fr/groupe/rse/engagements/maitrise-des-impacts/air-emissions-et-climat/bilan-emissions-aeroportuaires (last access: 2 November 2017), 2013. 
AIRPARIF: Bilan des émissions de polluants atmosphériques et de gaz à effet de serre en Ile-de-France 2005, available at: http://www.airparif.asso.fr/_pdf/publications/Rinventaire_2005_201004.pdf (last access: 2 November 2017), 2010. 
AIRPARIF: Bilan des émissions de polluants atmosphériques et de gaz à effet de serre en Île-de-France pour l'année 2010 et historique 2000/2005, available at: http://www.airparif.asso.fr/_pdf/publications/inventaire-emissions-idf-2010-rapport-130731.pdf (last access: 2 November 2017), 2013. 
Ammoura, L., Xueref-Remy, I., Gros, V., Baudic, A., Bonsang, B., Petit, J.-E., Perrussel, O., Bonnaire, N., Sciare, J., and Chevallier, F.: Atmospheric measurements of ratios between CO2 and co-emitted species from traffic: a tunnel study in the Paris megacity, Atmos. Chem. Phys., 14, 12871–12882, https://doi.org/10.5194/acp-14-12871-2014, 2014. 
Ammoura, L., Xueref-Remy, I., Vogel, F., Gros, V., Baudic, A., Bonsang, B., Delmotte, M., Té, Y., and Chevallier, F.: Exploiting stagnant conditions to derive robust emission ratio estimates for CO2, CO and volatile organic compounds in Paris, Atmos. Chem. Phys., 16, 15653–15664, https://doi.org/10.5194/acp-16-15653-2016, 2016. 
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Short summary
Urbanized and industrialized areas are the largest source of fossil CO2. This work analyses the atmospheric CO2 variability observed from the first in situ network deployed in the Paris megacity area. Gradients of several ppm are found between the rural, peri-urban and urban sites at the diurnal to the seasonal scales. Wind direction and speed as well as boundary layer dynamics, correlated to highly variable urban emissions, are shown to be key regulator factors of the observed CO2 records.
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