1Laboratoire des Sciences du Climat et de l'Environnement (LSCE), Unité mixte CEA-CNRS-UVSQ, UMR8212, 91191 Gif-sur-Yvette, France
2Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), CNRS-IPSL, 94010 Creteil, France
3Laboratoire de Physique Moléculaire pour l'Atmosphère et l'Astrophysique (LPMAA), CNRS, Université Pierre et Marie Curie, 75005 Paris, France
4Insitute of Arctic and Alpine Research (INSTAAR), University of Colorado, Boulder, USA
5AIRPARIF, Association de Surveillance de la Qualité de l'Air en Ile-de-France, Paris, France
*now at: Laboratoire de Métrologie Physique (LaMP), CNRS, 63171 Aubière, France
**now at: Laboratoire Interdisciplinaire de Physique (LiPhy), CNRS, Université Joseph Fourier, 38402 Saint Martin d'Hères, France
Abstract. Measurements of the mole fraction of the CO2 and its isotopes were performed in Paris during the MEGAPOLI winter campaign (January–February 2010). Radiocarbon (14CO2) measurements were used to identify the relative contributions of 77% CO2 from fossil fuel consumption (CO2ff from liquid and gas combustion) and 23% from biospheric CO2 (CO2 from the use of biofuels and from human and plant respiration: CO2bio). These percentages correspond to average mole fractions of 26.4 ppm and 8.2 ppm for CO2ff and CO2bio, respectively. The 13CO2 analysis indicated that gas and liquid fuel contributed 70% and 30%, respectively, of the CO2 emission from fossil fuel use. Continuous measurements of CO and NOx and the ratios CO/CO2ff and NOx/CO2ff derived from radiocarbon measurements during four days make it possible to estimate the fossil fuel CO2 contribution over the entire campaign. The ratios CO/CO2ff and NOx/CO2ff are functions of air mass origin and exhibited daily ranges of 7.9 to 14.5 ppb ppm−1 and 1.1 to 4.3 ppb ppm−1, respectively. These ratios are consistent with different emission inventories given the uncertainties of the different approaches. By using both tracers to derive the fossil fuel CO2, we observed similar diurnal cycles with two maxima during rush hour traffic.